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1: High Efficiency Speaker Asylum, Hornresp website (0.00)
Posted by Wayne Parham on 2003-10-15, 05:52:10 (64.216.179.52)
David McBean's website is back up and running, for those that are interested. As always, it is available from the π Speakers website or at www.users.bigpond.com/dmcbean/ . David said the "Bigpond" .......
2: High Efficiency Speaker Asylum, McBean's web site is back up (0.00)
Posted by Wayne Parham on 2003-10-15, 05:42:06 (64.216.179.52)
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3: High Efficiency Speaker Asylum, Re: Capacitors in Crossover Network (0.00)
Posted by Wayne Parham on 2003-10-02, 22:20:23 (66.139.42.69)
You might be interested in Steve Bench's measurements of various capacitor types . .......
4: High Efficiency Speaker Asylum, Re: Horn phase and time alignment (0.00)
Posted by Wayne Parham on 2003-09-30, 11:06:30 (65.69.120.189)
Hi Bill! Good points. I think we're all in agreement that a good installation limits nulls and large multi-cycle shifts in the target listening environment. This is especially important for clarity in .......
5: High Efficiency Speaker Asylum, Re: Horn phase and time alignment (0.00)
Posted by Wayne Parham on 2003-09-30, 00:30:11 (65.69.120.189)
I agree with you about driver peaking , but it is not responsible for all of the phase shift shown. The compression driver was measured alone and it showed much less phase shift below 3kHz when not mo .......
6: High Efficiency Speaker Asylum, Re: Horn phase and time alignment (0.00)
Posted by Wayne Parham on 2003-09-29, 23:07:27 (65.69.120.189)
I think it's worth mentioning that the impedance chart shown is indicative of horns in general, and not just the one shown. You might want to look at some of the phase measurements included on that th .......
7: High Efficiency Speaker Asylum, Re: Horn phase and time alignment (0.00)
Posted by Wayne Parham on 2003-09-29, 21:52:13 (65.69.120.189)
Seems like I recall your description of the impedance of a Karlson cabinet. Probably acts like like a low-Q bandpass down low, and then like a filter chamber up high where the front panel acts like a .......
8: High Efficiency Speaker Asylum, Re: Horn phase and time alignment (0.00)
Posted by Wayne Parham on 2003-09-29, 17:28:51 (65.69.120.189)
Hi Fred! What do you think those Karlsons do in regards to phase? Wayne .......
9: High Efficiency Speaker Asylum, Horn phase and time alignment (0.00)
Posted by Wayne Parham on 2003-09-29, 16:06:07 (65.69.120.189)
How do you folks feel about time alignment here? 1. How important is it? 2. How audible is it? 3. How far from the perfect zero phase shift would you describe as being "time aligned?" a. Can a speaker .......
10: High Efficiency Speaker Asylum, Baffle size and placement issues (0.00)
Posted by Wayne Parham on 2003-09-26, 12:30:56 (65.69.120.189)
There are a handful of simple issues and ways to address them. One is baffle step, where radiation transitions from being half-space to free-space. At high frequencies, the baffle acts as a boundary l .......
11: High Efficiency Speaker Asylum, Re: Speaker phasing - a common problem. (0.00)
Posted by Wayne Parham on 2003-09-25, 22:10:34 (65.69.120.189)
Hi GM! You're right, that the crossover rotates the phase. And both direct-radiator cabinets and horns create peaks in the phase response too. But as for physical connections, here's a link to a JBL p .......
12: High Efficiency Speaker Asylum, Delta 15 (0.00)
Posted by Wayne Parham on 2003-09-25, 16:45:50 (65.69.120.189)
Hi Duke! Eminence Delta 15's work pretty well in vented cabinets, but they have to be large. Use of a vented cabinet of 5ft 3 to 20ft 3 tuned between 30Hz and 40Hz offers pretty good performance. Wayn .......
13: High Efficiency Speaker Asylum, Re: Tom Danley - P.T. Barnum of the industry (0.00)
Posted by Wayne Parham on 2003-09-17, 01:43:50 (64.216.179.59)
Honestly, Tom, I'm expecting an apology. You need to acknowledge the manipulative tactics you used in this E-Mail thing . It was entirely a fabrication of yours, and you need to be held accountable .......
14: High Efficiency Speaker Asylum, Re: Horn phase (0.00)
Posted by Wayne Parham on 2003-09-17, 01:12:04 (64.216.179.59)
Perhaps you will post some examples of horns that have zero phase throughout their passbands. You have promoted time alignment as one of your main marketing strategies, so I can see that you are zealo .......
15: High Efficiency Speaker Asylum, Horn phase (0.00)
Posted by Wayne Parham on 2003-09-14, 22:29:09 (64.216.179.59)
When disparate results are obtained using different measurement systems, one must consider the possibility of ambiguity. But there is no ambiguity in the correlation between phase and the ratios of .......
16: High Efficiency Speaker Asylum, Re: Tom Danley - P.T. Barnum of the industry (0.00)
Posted by Wayne Parham on 2003-09-14, 16:32:30 (64.216.179.59)
Well, Tom, I see you'd rather talk around the subject than respond to it directly. The E-Mail issue was a fabrication of yours. And the phase issue is an equivocation of yours. You rightly discuss tha .......
17: High Efficiency Speaker Asylum, Tom Danley - P.T. Barnum of the industry (0.00)
Posted by Wayne Parham on 2003-09-14, 04:25:20 (64.216.179.59)
OK, Tom, so let me see if I get this straight: You say the letter from John Hancock that was forwarded to you, and my reply that was also copied to you, were misunderstood by you and everyone else in .......
18: High Efficiency Speaker Asylum, Re: Driver operation & E-mails (0.00)
Posted by Wayne Parham on 2003-09-13, 18:43:14 (64.216.179.59)
Tom - Doesn't this kind of thing ever get old to you? Do you enjoy acting like this? In my first reply to you on this thread, I said "The mass/spring system forms a filter that changes phase with freq .......
19: High Efficiency Speaker Asylum, Re: Driver operation & E-mails (0.00)
Posted by Wayne Parham on 2003-09-13, 07:48:02 (64.216.179.59)
Tom - Here we go with more of your double-speak. If you can't make an argument work to buttress your ego, you'll try misdirection instead. I have been the person that has consistently stated that loud .......
20: High Efficiency Speaker Asylum, Re: Driver operation & E-mails (0.00)
Posted by Wayne Parham on 2003-09-12, 15:31:09 (64.216.179.59)
Tom - You are really a piece of work. You've restated the same things in every post. You've tried to make it sound like you didn't fabricate the whole E-Mail issue. And you've also tried to make it so .......
21: High Efficiency Speaker Asylum, Re: Wave shape (0.00)
Posted by Wayne Parham on 2003-09-12, 03:52:06 (64.216.179.59)
There's no way for you to put spin on this and make it appear any different than it is. First, I'll reply about the mechanical mass/suspension loading issue that you keep saying I'm "evading." I've r .......
22: High Efficiency Speaker Asylum, Re: Wave shape (0.00)
Posted by Wayne Parham on 2003-09-11, 08:50:42 (64.216.179.59)
Tom - There's no need for me to restate the facts because we discussed all this just a few posts back in this thread. The only letter that was addressed to you was the one you posted already, which is .......
23: High Efficiency Speaker Asylum, Re: Wave shape (0.00)
Posted by Wayne Parham on 2003-09-10, 22:43:06 (64.216.179.59)
Tom - Please do post the E-Mail that John Hancock wrote. Post my reply to him. You've already posted the letter I wrote to you, but then again, I had posted it two months earlier. You're just trying t .......
24: High Efficiency Speaker Asylum, Re: Wave shape (0.00)
Posted by Wayne Parham on 2003-09-10, 04:34:06 (64.216.179.59)
Tom Danley wrote: [about the issue discussed here ] >> I will ask Pat to forward me your e-mails you sent to the office >> in case you still can't remember who threatened legal action to who. This sta .......
25: High Efficiency Speaker Asylum, Re: Following worm spoor to the source. (0.00)
Posted by Wayne Parham on 2003-09-09, 15:17:00 (64.216.179.59)
Tom - Nowhere in the letter you posted is there mention of a lawsuit. Litigation is rarely a good option, usually causing more harm than good. The only exception I've found is policing intellectual pr .......
26: High Efficiency Speaker Asylum, Re: Wave shape (0.00)
Posted by Wayne Parham on 2003-09-09, 14:46:42 (64.216.179.59)
Tom - As is typical of you, you misrepresent the facts. So let's see if we can't bring some honesty into the discussion, shall we? I said that if a loudspeaker were to act as as a filter that presente .......
27: High Efficiency Speaker Asylum, Re: Holism and Reductionism - Fourier Series (0.00)
Posted by Wayne Parham on 2003-09-09, 14:18:38 (64.216.179.59)
Tom - By protesting to my last post, it only goes to show how you would rather sensationalize the issues than to honestly discuss them. Thus, it appears that your participation on these forums is pure .......
28: High Efficiency Speaker Asylum, Re: shhhhh :-O *nt* (0.00)
Posted by Wayne Parham on 2003-09-09, 03:01:08 (64.216.179.59)
That would imply someone had put worms in a can in the first place. So now that you mention it, Mike, I think that's probably as good a way to say it as any. .......
29: High Efficiency Speaker Asylum, Re: Holism and Reductionism - Fourier Series (0.00)
Posted by Wayne Parham on 2003-09-09, 02:31:42 (64.216.179.59)
Tom - Are you kidding me? Remember that I am skeptical of claims of perfect acoustic phase by loudspeaker manufacturers. I'm agreeing with Dawson's assertion that the perfect quadrature is non-realiza .......
30: High Efficiency Speaker Asylum, Re: Wave shape (0.00)
Posted by Wayne Parham on 2003-09-08, 23:14:55 (64.216.179.59)
Hi John! I got into this conversation late, but I think what Dawson was saying in this part of the thread is essentially that if the loudspeaker were to cause a constant -90 o phase shift, then the us .......
31: High Efficiency Speaker Asylum, Re: LAB Horn Subwoofer (0.00)
Posted by Wayne Parham on 2003-09-08, 13:18:47 (64.216.179.59)
I doubt very seriously that there ever was a "lawsuit threat" and I was amazed to see that claim stated here. The so-called "haggler" was most likely a fabrication. .......
32: High Efficiency Speaker Asylum, Holism and Reductionism - Fourier Series (0.00)
Posted by Wayne Parham on 2003-09-07, 15:41:25 (64.216.179.59)
Hi Tom! I just came across this post from you. Good call. You might like some of the links contained in the post called " Holism and Reductionism - Fourier Series ." There's lots of great stuff the .......
33: High Efficiency Speaker Asylum, Response curves from various alignments (0.00)
Posted by Wayne Parham on 2003-09-07, 14:33:09 (64.216.179.59)
Great post! In the spirit of "a picture worth a thousand words," the alignments you've described are illustrated with response curves in the post called " Response curves of closed vs. vented systems .......
34: High Efficiency Speaker Asylum, A Note about Measurements (0.00)
Posted by Wayne Parham on 2003-09-02, 06:17:53 (66.137.59.209)
Hi Derick! This is a bit of a side-track from the original query about the German speakers. But I'd like to make a comment about measurements, which I think is relevant here especially if they are bei .......
35: High Efficiency Speaker Asylum, Re: Yield strength (0.00)
Posted by Wayne Parham on 2003-08-10, 17:25:34 (66.137.58.166)
The link to the University of Maine was included in my post so that a fully qualified technical opinion could be found, if desired. Those that want a really complete explaination are encouraged to rea .......
36: High Efficiency Speaker Asylum, Maybe contact Pioneer (0.00)
Posted by Wayne Parham on 2003-08-09, 23:26:33 (66.137.58.166)
You've probably already thought of this, but I'd call or write the manufacturer at customer.support@pioneerservice.com or (800) 872-4159. I'll bet they still have engineering data for their pre-1990's .......
37: High Efficiency Speaker Asylum, Re: Thnx (0.00)
Posted by Wayne Parham on 2003-08-09, 23:04:30 (66.137.58.166)
Sorry I misspelled your name, Eric. .......
38: High Efficiency Speaker Asylum, Cool stuff Erik! (0.00)
Posted by Wayne Parham on 2003-08-09, 00:51:28 (66.137.58.166)
Hi Erik! I would expect good performance from a horn of this scale. I'd be interested in knowing their performance when you get 'em done. Have you modeled them to know what to expect? Wayne ::: TOPIC: .......
39: High Efficiency Speaker Asylum, Yield strength (0.00)
Posted by Wayne Parham on 2003-08-08, 00:42:33 (66.137.58.166)
One of the M.E.'s here will do a much better job of explaining this than an E.E. like me. But I think it's interesting stuff, so I'll give it a go. The reason for failure of a metal diaphragm surround .......
40: High Efficiency Speaker Asylum, Re: Hornresp (0.00)
Posted by Wayne Parham on 2003-07-29, 02:05:20 (65.69.121.222)
Hello again John! You wrote: >> I usually get good correlation between Hornresp's predicted >> frequency response and electrical impedance and reality if I build >> something that it is designed to si .......
41: High Efficiency Speaker Asylum, Hornresp (0.00)
Posted by Wayne Parham on 2003-07-28, 22:32:45 (65.69.121.222)
Hi John! This is a little bit off the subject of your post, but it is related generally. What do you think of the plots produced by McBean's Hornresp ? I compared the resistive and reactive (real an .......
42: High Efficiency Speaker Asylum, Probably can't get 'em on E-Bay. (0.00)
Posted by Wayne Parham on 2003-07-27, 16:59:15 (65.69.121.222)
They sure aren't budget models. But if "Magnetar" is skeptical, they might be pretty good. I'd say give 'em a listen. Wayne .......
43: High Efficiency Speaker Asylum, Re: flux modulation (0.00)
Posted by Wayne Parham on 2003-07-27, 15:24:27 (65.69.121.222)
Hi Paul! Look at the magnetic FEA offerings of Vector Fields and of Ansoft . You can readily model magnetic circuits with this software, and there are free downloadable student versions of various FEA .......
44: High Efficiency Speaker Asylum, A statement from Wayne Parham (0.00)
Posted by Wayne Parham on 2003-07-26, 15:34:39 (65.69.121.222)
Tom, I am not absolutely certain that you are referring to me in this and other similar posts, but it appears that you are. So I'd like to make a statement about this matter. If you were referring to .......
45: High Efficiency Speaker Asylum, You've got mail (0.00)
Posted by Wayne Parham on 2003-06-25, 09:03:29 (65.69.121.4)
.......
46: High Efficiency Speaker Asylum, Re: Guffey meets every definition of troll (0.00)
Posted by Wayne Parham on 2003-06-23, 18:18:52 (65.69.121.4)
Hello Stephaen! I have written to Rod about these matters numerous times. Moderation here seems hit and miss, and we've discussed the problem. He seems to take a hands-off approach these days. I'm of .......
47: High Efficiency Speaker Asylum, Re: Guffey meets every definition of troll (0.00)
Posted by Wayne Parham on 2003-06-18, 19:23:30 (66.139.42.124)
Hello Ken, all - I'm of the opinion that the moderator should always remove any messages that don't adhere to the rules of the forum. I've been slammed here a lot lately, and with no good reason. I'm .......
48: High Efficiency Speaker Asylum, Re: "Folk Lore Math" (0.00)
Posted by Wayne Parham on 2003-06-14, 15:28:49 (65.69.121.42)
Consider carefully the conditions of the Webster equation. Specifically, one of the conditions is that the cross-section pressure be equal in the horn. This is something that cannot be satisfied by a .......
49: High Efficiency Speaker Asylum, Re: "Folk Lore Math" (0.00)
Posted by Wayne Parham on 2003-06-14, 05:02:52 (65.69.121.42)
I agree with you, Bob, and our thoughts are almost identical in this regard. Check out my comments in the post called " Parameter shifts ," where you will see similar views expressed, albeit it from a .......
50: High Efficiency Speaker Asylum, "Folk Lore Math" (0.00)
Posted by Wayne Parham on 2003-06-13, 16:15:36 (65.69.121.42)
The earlier Keele/Leach discussion referenced a 50Hz-500Hz horn and the differences in the descriptions of the proposed device using Keele and Leach models. It looks like the idea was to zero in on th .......
51: High Efficiency Speaker Asylum, Re: Collapsing directivity and breakup modes (0.00)
Posted by Wayne Parham on 2003-06-13, 02:39:16 (65.69.121.42)
Having a tall but narrow orifice for a mouth will increase dispersion side to side because it forms a diffraction slot . The truth is that you probably won't see collapsing directivity on a horn used .......
52: High Efficiency Speaker Asylum, Large conical horns (0.00)
Posted by Wayne Parham on 2003-06-13, 02:37:50 (65.69.121.42)
I agree with you about conical horns, so my vote is to set m = 0. That's what I'm running for 40Hz horns, and I like 'em a lot. I've been using that type of flare for almost 30 years now and it perfo .......
53: High Efficiency Speaker Asylum, Collapsing directivity and breakup modes (0.00)
Posted by Wayne Parham on 2003-06-12, 16:49:53 (65.69.121.42)
Agreed. Annular or circumferential breakup modes increase high frequency output and collapsing directivity does too on-axis. These issues are best analyzed with FEA models and laser interferometry or .......
54: High Efficiency Speaker Asylum, Models and Measurements (0.00)
Posted by Wayne Parham on 2003-06-12, 02:15:11 (65.69.121.42)
Hello Bruce! Glad to see you jump in on this discussion. You wrote: >> I found that placing a flat reflector over the curved bottom >> reflector restored the upper bandwith. The curved reflector >> wa .......
55: High Efficiency Speaker Asylum, Boundaries and Reflectors (0.00)
Posted by Wayne Parham on 2003-06-12, 00:43:17 (65.69.121.42)
Here's a link to the earlier "parent" thread for this discussion: Leach vs. Keele and high-mass vs. low-mass As for specific recommendations of horns or drivers, I think one reason you may not be ge .......
56: High Efficiency Speaker Asylum, Helmholtz link - Excellent (0.00)
Posted by Wayne Parham on 2003-06-11, 21:43:23 (65.69.121.42)
Excellent link, thanks .......
57: High Efficiency Speaker Asylum, Parameter shifts (0.00)
Posted by Wayne Parham on 2003-06-11, 21:30:34 (65.69.121.42)
Interesting observation you've made about parameter sensitivity in horns. Certainly larger horns (closer to infinite) are generally more tolerant that smaller horns, and boundary conditions such as ba .......
58: High Efficiency Speaker Asylum, Re: back EMF, horn loading and matched source (0.00)
Posted by Wayne Parham on 2003-06-11, 17:38:55 (65.69.121.42)
The point is that a motor with high-mass may be good for VLF-band applications when used with amplifiers having high current sinking ability. But it is clearly not the best choice when the subsystem m .......
59: High Efficiency Speaker Asylum, Re: back EMF peaking in the bottom octave (0.00)
Posted by Wayne Parham on 2003-06-11, 13:42:22 (65.69.121.42)
A horn raises the impedance within the pasband, but below that the driver acts very much like a direct radiator. In the bottom octave, the horn has some impedance peaks from motor diaphragm resonances .......
60: High Efficiency Speaker Asylum, "Folk lore math" (0.00)
Posted by Wayne Parham on 2003-06-11, 00:47:09 (65.69.121.127)
A couple of different horn design approaches have been discussed on this thread. That, in itself, makes for a very interesting discussion. Specifically, we've spoken about Leach's and Keele's mathemat .......
61: High Efficiency Speaker Asylum, Flea-powered amps, back EMF and current sinking ability (0.00)
Posted by Wayne Parham on 2003-06-11, 00:25:09 (65.69.121.127)
I agree that a driver having great power handling capacity does not necessarily mean it won't perform well at low levels. Also agreed that non-linearities will be proportionally reduced, so the massiv .......
62: High Efficiency Speaker Asylum, Re: Putland (0.00)
Posted by Wayne Parham on 2003-06-10, 16:15:24 (65.69.121.127)
Certainly academia isn't immune to egos and "arm waving." But I often find even more "spin" in the private sector. It's all about public perception, isn't it Tom? .......
63: High Efficiency Speaker Asylum, Re: Putland (0.00)
Posted by Wayne Parham on 2003-06-10, 16:09:20 (65.69.121.127)
Didn't mean to come across in a negative way. I just wanted to interject Dr. Putland's paper here because I feel it contains some really good new mathematical models. .......
64: High Efficiency Speaker Asylum, Re: Putland (0.00)
Posted by Wayne Parham on 2003-06-10, 13:40:54 (65.69.121.127)
I'm surprised you would shrug off this paper with such disregard. The models included are excellent. And you're right that Putland doesn't stop with the subject of horns. He also models other acoustic .......
65: High Efficiency Speaker Asylum, Putland (0.00)
Posted by Wayne Parham on 2003-06-10, 02:03:46 (65.69.121.127)
Let me remind you of the 1994 work done by Dr. Putland, which references prior work of Dr. Leach. You and I discussed this in an earlier thread, just a few days ago. There's a link to Putland's paper .......
66: High Efficiency Speaker Asylum, Mathematical models (0.00)
Posted by Wayne Parham on 2003-06-09, 15:32:24 (65.69.121.127)
Hi Tom! You wrote: >> So far as what Leach's math predicts, it is FAR better at scaling >> the acoustic load to suit the driver and bandwidth than the "folk >> lore math" as I have called it a few tim .......
67: High Efficiency Speaker Asylum, Crossover implementations with op-amps (0.00)
Posted by Wayne Parham on 2003-06-06, 15:27:34 (65.69.121.127)
Sounds like a good design. It's important to look at the crossover with respect to its participation in a loudspeaker system and not in isolation. There are acoustic and mechanical filters that are al .......
68: High Efficiency Speaker Asylum, Re: Crossover implementations (0.00)
Posted by Wayne Parham on 2003-06-06, 12:44:11 (65.69.121.127)
An active crossover contains amplifiers, which can be built using one (or more) of several different topologies. Some perform better than others, and certainly the quality of parts will contribute to .......
69: High Efficiency Speaker Asylum, Re: Crossover implementations (phase coherent?) (0.00)
Posted by Wayne Parham on 2003-06-06, 01:00:26 (65.69.121.127)
A nice write-up. You can make some really great stuff along these lines. All the things about systemic behaviours, phase and amplitude response, position and specific implementations apply to any circ .......
70: High Efficiency Speaker Asylum, Crossover implementations (0.00)
Posted by Wayne Parham on 2003-06-05, 22:13:00 (65.69.121.127)
Hi Clive! Phase is a function of crossover slope and type rather than a measure of quality. All crossover filters have a phase shift that corresponds to their slope and the direction of shift is oppos .......
71: High Efficiency Speaker Asylum, Early reflections (0.00)
Posted by Wayne Parham on 2003-06-05, 12:53:42 (65.69.121.127)
Hi Michael! Wow! We said the same thing, at nearly the same time. I guess that makes our thoughts like early reflections. [smile] Wayne .......
72: High Efficiency Speaker Asylum, Reverberent field and distance to boundaries (0.00)
Posted by Wayne Parham on 2003-06-05, 12:51:57 (65.69.121.127)
Perhaps what you're saying is that you like an anachoic environment, or one with as little reflected content as possible. If you make an assumption that there are lots of absorbent objects in a room, .......
73: High Efficiency Speaker Asylum, Re: Hornresp (0.00)
Posted by Wayne Parham on 2003-06-02, 15:32:47 (65.69.121.127)
I'd model the horn using the surface area of the cones as the throat, unless a compression ring were used. By compression ring, I mean a plate that is mounted in front of the driver that has a hole cu .......
74: High Efficiency Speaker Asylum, Hornresp (0.00)
Posted by Wayne Parham on 2003-06-02, 09:53:25 (65.69.121.127)
Looks like a pretty cool horn - Model it in Hornresp to be sure. .......
75: High Efficiency Speaker Asylum, Martinelli horns (0.00)
Posted by Wayne Parham on 2003-05-31, 23:39:41 (65.69.121.127)
Bill Martinelli has some very nice wood horns for the TAD 4001 . I really like these horns, and the billlet aluminum throats are excellent. They have O-Rings for a superior seal with the compressio .......
76: High Efficiency Speaker Asylum, Re: Filters as part of a system (0.00)
Posted by Wayne Parham on 2003-05-30, 08:43:39 (65.69.121.127)
Hi Tom! As you've said, filter design is one of the oldest parts of electronic theory. For loudspeakers, it's probably the biggest single challenge because the driver itself is reactive, and so forms .......
77: High Efficiency Speaker Asylum, Webster equation (0.00)
Posted by Wayne Parham on 2003-05-29, 22:29:27 (65.69.121.127)
Hi Paul! Sorry to jump in, but I felt you might be interested. The "continuum" of curves is described by the Webster equation (A.G. Webster, 1919). All horns of the Salmon family are described by the .......
78: High Efficiency Speaker Asylum, Resistance, reactance, peaking and filter Q (0.00)
Posted by Wayne Parham on 2003-05-28, 21:15:45 (65.69.121.127)
At the Midwest Audiofest, the " Crossover Electronics 101 " seminar included a demonstration showing how resistance affects a loudspeaker circuit. The effects of series (peaking) resistance and shunt .......
79: High Efficiency Speaker Asylum, Good post (0.00)
Posted by Wayne Parham on 2003-05-27, 06:19:56 (65.69.121.127)
Hi Jeff! That was a useful post. Thanks. Wayne .......
80: High Efficiency Speaker Asylum, Re: Replacing 16 Ohm midrange horn in 8 Ohm crossover system (0.00)
Posted by Wayne Parham on 2003-05-27, 01:11:42 (65.69.121.127)
Hi Hal! You would be fine using a 16 ohm resistor across your 16 ohm tweeter and then using an 8 ohm crossover. Not only will it make the load be closer to what the crossover filter needs, but it will .......
81: High Efficiency Speaker Asylum, JBL 2115 (0.00)
Posted by Wayne Parham on 2003-05-24, 20:33:53 (65.69.121.127)
The JBL 2115 is an 8" midwoofer that was made with either white or black cones, in 8 or 16 ohms. As I recall, the only reconing kits that are still available are white 16 ohm versions. The JBL 2115 wa .......
82: High Efficiency Speaker Asylum, 211-2 (0.00)
Posted by Wayne Parham on 2003-05-19, 21:04:42 (64.216.177.63)
The bulb I use is a 211-2 . It fires up at 1 amp and I use a pair of 'em in parallel for compression tweeters. .......
83: High Efficiency Speaker Asylum, Re: fusing HE drivers - Amperage (0.00)
Posted by Wayne Parham on 2003-05-19, 20:27:33 (64.216.177.63)
Yeah, bigger stuff needs more current, so a little fuse isn't practical. Honestly, I used to always fuse speakers because I thought it was a nice extra touch. But I've stopped because the parts I'm us .......
84: High Efficiency Speaker Asylum, Re: fusing HE drivers - Amperage (0.00)
Posted by Wayne Parham on 2003-05-19, 15:40:06 (64.216.177.63)
I've been doing well, thanks. And you? About the breakout current of your protection devices, man, 15 amps is pretty high. My experience has been that 1 amp fuses blow at about 100-150 watts on typica .......
85: High Efficiency Speaker Asylum, Re: fusing HE drivers - Amperage (0.00)
Posted by Wayne Parham on 2003-05-19, 14:06:57 (64.216.177.63)
15 amps, yikes! You sure you don't mean 1.5 amps? .......
86: High Efficiency Speaker Asylum, Re: Keele described it as Fhc (0.00)
Posted by Wayne Parham on 2003-05-18, 20:57:12 (64.216.177.63)
Hi Tom! You wrote: >> Interestingly, each different sloped region as shown has a seperate >> "time" delay involved (related to the group delay of added filter >> sections). Yes, it certainly must do e .......
87: High Efficiency Speaker Asylum, Keele described it as Fhc (0.00)
Posted by Wayne Parham on 2003-05-18, 14:26:08 (64.216.177.63)
Keele described the behaviour of horns as filter poles, each corresponding to an additional increase in rolloff slope. At high frequencies, the first mass-rolloff pole is at f HM , the voice-coil indu .......
88: High Efficiency Speaker Asylum, Push-pull woofers (0.00)
Posted by Wayne Parham on 2003-05-18, 13:04:37 (64.216.177.63)
Hello again Dennis! This configuration looks interesting, and I'm starting to look at it closely. The π cornerhorn can easily be built with dual woofers and it has a plenium of sorts. Since the woo .......
89: High Efficiency Speaker Asylum, Re: PPSL (0.00)
Posted by Wayne Parham on 2003-05-18, 04:19:20 (64.216.177.63)
Hi Dennis! I've been thinking about this configuration since you brought it up, and it seems to me that it might reduce second harmonics whether they are caused by non-linearities in the suspension or .......
90: High Efficiency Speaker Asylum, Re: 9v for polarity? (0.00)
Posted by Wayne Parham on 2003-05-17, 14:28:37 (64.216.177.63)
No, you didn't damage the speaker. Just the opposite - There wasn't enough current to move the cone enough to see. .......
91: High Efficiency Speaker Asylum, Re: PPSL (0.00)
Posted by Wayne Parham on 2003-05-17, 01:11:03 (64.216.177.63)
Hi Dennis! I agree with others on this thread - I'd like to see more discussion of this. Can you show some more detail and maybe link some references? I can see how second harmonics would be suppresse .......
92: High Efficiency Speaker Asylum, Re: 9v for polarity? (0.00)
Posted by Wayne Parham on 2003-05-16, 23:57:20 (64.216.177.63)
The frequency of any battery is 0Hz 'cause it's D.C. The power dissipated by an 8 ohm load across a 9 volt source is 10 watts. But then again, the speaker isn't likely to have 8 ohms D.C. resistance - .......
93: High Efficiency Speaker Asylum, Subwoofer configurations (0.00)
Posted by Wayne Parham on 2003-05-16, 02:49:27 (64.216.177.63)
Hi Dennis! Sounds like a great solution. I'm fond of a similar system, a three-way using the JBL 2245, 2123 and 2426 or a 2142, 2012 and 2426. Using the 2206 in place of the 2012 or 2123 would be exce .......
94: High Efficiency Speaker Asylum, Re: The Most Amazing Thing I Never Knew (so far) (0.00)
Posted by Wayne Parham on 2003-05-15, 00:38:21 (64.216.177.63)
That really is a neat story; I like the history of technology, especially stuff like this. Did you ever play with electronics experimenters kits as a kid? Remember the "1000-in-1" kits and stuff like .......
95: High Efficiency Speaker Asylum, Martinelli horns (0.00)
Posted by Wayne Parham on 2003-05-13, 17:16:12 (64.216.177.63)
Hi Bryan! I'd suggest Martinelli wood horns also. Bruce Edgar is a nice guy but so is Bill Martinelli. Bill has been making horns like these for a while now, and has 12", 17" and larger versions avail .......
96: High Efficiency Speaker Asylum, Re: 4435/4350 (0.00)
Posted by Wayne Parham on 2003-05-12, 17:01:40 (64.216.177.63)
Yep, Dennis, sounds like a good solution to me. There are a lot of good solutions out there. Some of 'em will even fit through the door. [smile] Wayne .......
97: High Efficiency Speaker Asylum, Re: Building small 3-way to minimize FMD - what's needed? (0.00)
Posted by Wayne Parham on 2003-05-12, 14:28:15 (64.216.177.63)
I used 5" cone midrange JBL 2105's with 15" JBL 2205 woofers in the 80's version four and seven π models. They sounded fantastic crossed at 500Hz, first-order. That slow slope means my midrange dri .......
98: High Efficiency Speaker Asylum, Re: Building small 3-way to minimize FMD - what's needed? (0.00)
Posted by Wayne Parham on 2003-05-12, 14:16:11 (64.216.177.63)
Hi Freddy! I like the JBL 2245, 2123 and 2426 or alternatively the 2142, 2012 and 2426. You could also do the same with Eminence components. But I'm not sure I'd go with a 12" woofer for a high-effici .......
99: High Efficiency Speaker Asylum, Re: Intermodulation (0.00)
Posted by Wayne Parham on 2003-05-12, 04:18:05 (64.216.177.63)
Hello again Dennis! I think it's interesting too. Thanks for the link! About intermodulation - I've built two-way speakers and three-way speakers over the years, and I've run various crossover points .......
100: High Efficiency Speaker Asylum, Intermodulation (0.00)
Posted by Wayne Parham on 2003-05-11, 20:16:51 (64.216.177.63)
Hi Dennis! About intermodulation, check out Matts post about hetrodyning . Also of interest is Paul's reply, because he is a well-respected musician that frequents the forum and that has an excellent .......
101: High Efficiency Speaker Asylum, Boundary reflections (0.00)
Posted by Wayne Parham on 2003-05-11, 14:21:34 (64.216.177.63)
Hi guys! Hope you don't mind my jumping in with a thought or two. Most every speaker installation will generate reflections from floor bounce and side walls, not to mention from items within the liste .......
102: High Efficiency Speaker Asylum, Re: Big sound at DC (tornado) (0.00)
Posted by Wayne Parham on 2003-05-09, 12:52:58 (66.139.42.127)
Hi Tom! I'm in Tulsa, thanks. We had some activity here, but we always do this time of year. Great Plains Audio - the Altec shop - is in OKC. Wayne .......
103: High Efficiency Speaker Asylum, Lightning Protection (0.00)
Posted by Wayne Parham on 2003-05-09, 00:07:42 (66.139.42.127)
Hi Tom! Wow! Offline for a month and a half because of lightning - What a hassle! It's good you have it sorted out now. I had a nearby lightning strike in the mid-80's - A huge hit. But one of the thi .......
104: High Efficiency Speaker Asylum, "Loudspeakers on Damped Pipes" (0.00)
Posted by Wayne Parham on 2003-05-08, 23:21:20 (66.139.42.127)
Another great link, Freddy, thanks! Augsperger suggests modeling transmission line loudspeakers as analog filters in the link you provided to his AES paper, " Loudspeakers on Damped Pipes ." This is .......
105: High Efficiency Speaker Asylum, Peter Jensen (0.00)
Posted by Wayne Parham on 2003-05-08, 22:21:47 (66.139.42.127)
Oh, Jeez, you're right. Peter Jensen deserves a lot more credit than he gets. I suspect it is because of the car stereo stuff - People in the last generation or two assume that Jensen is just run-of- .......
106: High Efficiency Speaker Asylum, Lightning strike (0.00)
Posted by Wayne Parham on 2003-05-08, 17:13:13 (66.139.42.127)
Hi Tom! What happened with the lightning strike? I expected to see you at the Midwest Audiofest, was lightning related to why you weren't there? Wayne .......
107: High Efficiency Speaker Asylum, Leach and Linkwitz too (0.00)
Posted by Wayne Parham on 2003-05-08, 15:18:14 (66.139.42.127)
Hi Freddy! Great link of the interview with Harry Olson , thanks. We definitely shouldn't forget Marshall Leach either. His name was absent in the list of horn guys, and it shouldn't be absent here to .......
108: High Efficiency Speaker Asylum, Loudspeaker Pioneers (0.00)
Posted by Wayne Parham on 2003-05-08, 01:35:49 (64.216.178.80)
An interesting thread below mentioned some of the people who have worked to investigate and implement horns for loudspeakers. I thought it would also be fun to look over the last century or so at some .......
109: High Efficiency Speaker Asylum, A. G. Webster (0.00)
Posted by Wayne Parham on 2003-05-07, 00:51:09 (64.216.178.80)
Hello Rob! No list of "audio greats" would be complete without including A.G. Webster, particularly where horns are concerned. Horns are probably man's oldest acoustic device, but the Webster equation .......
110: High Efficiency Speaker Asylum, Mathematical models (0.00)
Posted by Wayne Parham on 2003-05-05, 12:55:08 (66.139.43.127)
Hi Bill! I am a person that like to use models to describe the behaviour of systems, for much the same reason that you like empirical methods. The models are there simply to describe what you find wit .......
111: High Efficiency Speaker Asylum, Re: This proves my point... (0.00)
Posted by Wayne Parham on 2003-05-05, 12:42:41 (66.139.43.127)
Yes, it does. David has clearly stated that his program uses a rigid diaphragm model and that the response curve generated reflects that which is produced by a constant directivity horn, i.e. the pow .......
112: High Efficiency Speaker Asylum, Smile (0.00)
Posted by Wayne Parham on 2003-05-05, 12:33:38 (66.139.43.127)
Hi Charles! About finding breakup modes with microphones, I agree that you can look for the signature of this sort of behaviour. And about finding electrodynamic speakers that don't exhibit this behav .......
113: High Efficiency Speaker Asylum, Re: Breakup modes (0.00)
Posted by Wayne Parham on 2003-05-04, 21:55:47 (66.139.43.127)
Hi Charles! You may be right about the B&W, Avalon and Thiel speakers not running any driver in breakup modes, but I'm a bit skeptical to be honest. There are technologies that don't have mechanisms t .......
114: High Efficiency Speaker Asylum, Horns at high frequencies (0.00)
Posted by Wayne Parham on 2003-05-04, 19:37:04 (66.139.43.127)
Hi Charles and Bill! I can understand both sets of statements that each of you are saying. I've had similar discussions with people before. Coming at this from the perspective of an electrical enginee .......
115: High Efficiency Speaker Asylum, Tweeter protection (0.00)
Posted by Wayne Parham on 2003-04-30, 23:33:45 (67.28.95.189)
Hi Sam! Lots of guys build their own crossovers, and it's a lot of fun. You can also get boutique parts, as you've said. But don't assume that protection components put a lot of stuff in the signal pa .......
116: High Efficiency Speaker Asylum, Crossover types (0.00)
Posted by Wayne Parham on 2003-04-30, 23:19:56 (67.28.95.189)
Hi Ted! Honestly, I don't hear much difference in passive crossovers using Linkwitz and Butterworth values. The idea behind the Linkwitz was to give a bit more linearity in the crossover region becaus .......
117: High Efficiency Speaker Asylum, Mouth diffraction (0.00)
Posted by Wayne Parham on 2003-04-29, 11:16:46 (67.75.179.100)
Hi Sam! If I remember correctly, the foam at the edges of the Peavey horn was put there to decrease edge diffraction. Edge diffraction will increase directivity for a narrow band of frequencies but wi .......
118: High Efficiency Speaker Asylum, Re: Astigmatism (0.00)
Posted by Wayne Parham on 2003-04-28, 22:31:11 (67.75.179.100)
Hi Tom! I agree, 100%. My observations and conclusions were exactly the same as yours. It's important in arrays, for sure. But not a problem in individual use or very small numbers, like a pair used f .......
119: High Efficiency Speaker Asylum, Astigmatism (0.00)
Posted by Wayne Parham on 2003-04-28, 11:16:18 (67.75.179.100)
Hi Tom! I think what Todd is talking about is the astigmatism caused by two different tapers in the horizontal and vertical on certain horn types. It causes what appears to be two different apparent s .......
120: High Efficiency Speaker Asylum, Re: Sources and recommendations for crossover caps... (0.00)
Posted by Wayne Parham on 2003-04-27, 21:56:02 (67.75.179.100)
Hello DeKay! You wrote: >> Am I limited to 30V caps (didn't see any online) or could I sub a >> higher value as long as I stick with the 2MFD? You can go up in voltage if you'd like. Just make sure th .......
121: High Efficiency Speaker Asylum, 20uF capacitor on 800Hz horn - Observations (0.00)
Posted by Wayne Parham on 2003-04-27, 13:51:24 (67.75.179.100)
Hi Freddy! You've brought up another important consideration when using single capacitor crossovers on horns at or near the flare rate. You've observed a high-order slope when the slope expected from .......
122: High Efficiency Speaker Asylum, Re: Electrical resonance (0.00)
Posted by Wayne Parham on 2003-04-27, 00:52:27 (67.75.181.107)
Hi Steve! Bruce and I spoke briefly about this matter at the Midwest Audiofest. There are some measurements that show the effect quite clearly in the earlier post called " Low-order and high-order cro .......
123: High Efficiency Speaker Asylum, Electrical resonance (0.00)
Posted by Wayne Parham on 2003-04-26, 13:16:21 (67.75.176.246)
Hi Steve! With your passive crossovers, what do you do to reduce electrical resonance in the passband? Do you damp them with shunt resistance? Or do you use capacitors so large that they're not acting .......
124: High Efficiency Speaker Asylum, Ringing like a bell (0.00)
Posted by Wayne Parham on 2003-04-26, 13:11:13 (67.75.176.246)
Hi Steve! You wrote: >> I'm not a fan of cast aluminum horns in general- horns need to be >> built from some material that doesn't ring all day when struck. I agree. Lots of guys used to de-stress the .......
125: High Efficiency Speaker Asylum, I couldn't agree more either (0.00)
Posted by Wayne Parham on 2003-04-26, 11:25:13 (67.75.183.97)
Hi Bill! Just like Norm said below, I couldn't agree more. I thought everything at the Midwest Audiofest sounded great, with only a couple of exceptions. And even they weren't bad. But the point is th .......
126: High Efficiency Speaker Asylum, Altec horns are pretty hard to beat, actually (0.00)
Posted by Wayne Parham on 2003-04-26, 00:44:33 (67.75.176.131)
Hi Eric! I definitely prefer the wider dispersion provided by Altec horns to axisymetric horns, particularly for the home or small theater or club. If only a small number of loudspeakers are used to c .......
127: High Efficiency Speaker Asylum, 6DJ8 crossover (0.00)
Posted by Wayne Parham on 2003-04-24, 10:25:43 (65.57.61.125)
Hello! Check out this 6DJ8 crossover . It's an adaptation of Steve Bench's design, it's great for horns, and circuit boards are available. Contact Gary Kaufman if you're interested. Also, Sam P. runs .......
128: High Efficiency Speaker Asylum, Re: Q (0.00)
Posted by Wayne Parham on 2003-04-22, 21:39:29 (65.57.57.201)
Thanks for your comments, Tom and Ivan303 . I think it is worth noting that most Eminence woofers are purpose designed for bass-reflex boxes. The ten π basshorn performs better with JBL and other l .......
129: High Efficiency Speaker Asylum, Q (0.00)
Posted by Wayne Parham on 2003-04-22, 13:28:23 (65.57.57.201)
Hi Bruce! I've found the same thing. Q is a little high on most of their speakers - More suited for bass-reflex cabinets, where they are excellent. Wayne .......
130: High Efficiency Speaker Asylum, Re: What? (0.00)
Posted by Wayne Parham on 2003-04-22, 07:59:59 (65.56.175.98)
That's why I asked why you brought up "power response." This is a term that describes the output of a device irrespective of its directionality. It's usually used in discussions about horns, to decoup .......
131: High Efficiency Speaker Asylum, Flux stabilization ring (0.00)
Posted by Wayne Parham on 2003-04-22, 07:52:38 (65.56.175.98)
Hi Bill! I like the Eminence parts too - they're great parts and we have a warehouse full of 'em. In fact, most of my product line uses Eminence. But don't overlook the JBL's because of their price. T .......
132: High Efficiency Speaker Asylum, Re: What? (0.00)
Posted by Wayne Parham on 2003-04-22, 00:36:06 (65.56.175.98)
Are you sure that's what he meant? He wrote, "What often appears to measure "flat" with these in relation to the midrange/woofers normally is a little hot IME." Sure looked to me like he was talking a .......
133: High Efficiency Speaker Asylum, What? (0.00)
Posted by Wayne Parham on 2003-04-22, 00:20:49 (65.56.175.98)
What? You wrote: >> What often appears to measure "flat" with these in relation to the >> midrange/woofers normally is a little hot IME. I think it's due to >> the broad power response. It's best to t .......
134: High Efficiency Speaker Asylum, Hi Bill (0.00)
Posted by Wayne Parham on 2003-04-21, 14:18:32 (65.56.175.98)
Hi Bill! Sorry to make a fork in the thread, but do you have any experience with JBL 22xx series motors? Many of them are intended as midwoofers, and they reproduce the vocal range and overtones very .......
135: High Efficiency Speaker Asylum, JBL 22xx Series (0.00)
Posted by Wayne Parham on 2003-04-21, 13:49:06 (65.56.175.98)
Hi Bill! I've built lots of stuff with JBL's and I've had a tendency in the last decade or so to push 'em up pretty far. The truth is that you might be surprised at the performance of the 22xx series .......
136: High Efficiency Speaker Asylum, European and American homes (0.00)
Posted by Wayne Parham on 2003-04-19, 10:30:57 (63.208.41.149)
Hello Deckers! You wrore: >> I have noticed that the European people here and elsewhere >> complain a lot about Bass and never treble. I suspect this may have something to do with home construction. N .......
137: High Efficiency Speaker Asylum, Handouts from the Crossover Seminar (0.00)
Posted by Wayne Parham on 2003-04-14, 19:53:43 (67.30.71.180)
Hi guys! Mike Baker is definitely the man of the hour, isn't he? In about a year and a half, he's become one of the most well-liked people in this corner of the internet. And there's good reason for i .......
138: High Efficiency Speaker Asylum, Good stuff! (0.00)
Posted by Wayne Parham on 2003-04-09, 12:51:29 (67.75.177.189)
Hi Mike! I'm enjoying a pair of tower two π 's right now, the ones that I'll be showing in Lima. The reviewer damaged the fine finish that Bill worked so hard to achieve, but they're still beautifu .......
139: High Efficiency Speaker Asylum, "Improvements in Monitor Loudspeaker Systems" (0.00)
Posted by Wayne Parham on 2003-04-05, 16:06:24 (67.30.71.106)
Hello! There are strengths and weaknessness of each design choice, including the decision about where and how many points to split the audio band. When making a large-format two-way loudspeaker, many .......
140: High Efficiency Speaker Asylum, www.GreatPlainsAudio.com (0.00)
Posted by Wayne Parham on 2003-04-04, 00:28:44 (67.30.69.71)
Hello! Try www.GreatPlainsAudio.com in Oklahoma City. I'll bet they can give you a hand because the 511 is an Altec horn, and they specialize in Altec parts. Take care! Wayne Parham .......
141: High Efficiency Speaker Asylum, Altec 511 horns (0.00)
Posted by Wayne Parham on 2003-04-02, 19:32:27 (67.75.179.178)
Hello! The 511 is an Altec horn. Notice the black horn beside and in front of the drapes in the picture above? That's an Altec 511. Take care! Wayne Parham .......
142: High Efficiency Speaker Asylum, Re: two Pi towers (0.00)
Posted by Wayne Parham on 2003-04-02, 16:44:24 (67.75.179.178)
Hello again Tom - You wrote: >> As I recall Servo Mark was not talking about a product >> he sells but a product that Servo Tom designed but >> doesn't sell, self promotion of the ego perhaps but >> n .......
143: High Efficiency Speaker Asylum, Re: two Pi towers (0.00)
Posted by Wayne Parham on 2003-04-02, 12:57:46 (65.57.61.217)
Tom - 1. I responded to a direct comment about π speakers. I did not respond to posts about another product by suggesting my own. 2. I also refrained from responding with price quotes or contact in .......
144: High Efficiency Speaker Asylum, Re: two Pi towers (0.00)
Posted by Wayne Parham on 2003-04-01, 20:52:05 (65.57.61.217)
Hi Mike - You wrote: >> It appears the BM built speakers are somewhere between $1500 and >> $1700 a pair after shipping. The most popular π Speaker in that price range is the Theater Series four &p .......
145: High Efficiency Speaker Asylum, Re: two Pi towers (0.00)
Posted by Wayne Parham on 2003-04-01, 16:30:51 (65.57.61.217)
Hello again Mike - The reviewer was pleased with the two π towers, even comparing them with $4000.00 speakers. That certainly makes them fare well at their price point, and I agree that this invite .......
146: High Efficiency Speaker Asylum, two Pi towers (0.00)
Posted by Wayne Parham on 2003-04-01, 13:28:21 (65.57.61.217)
Hello Mike - The two π towers that were reveiewed will be at the Midwest Audiofest . The reviewer liked them so much, he kept 'em for six months. See you in Lima. - Wayne .......
147: High Efficiency Speaker Asylum, Re: Download McBean's horn program. (0.00)
Posted by Wayne Parham on 2003-03-31, 17:09:09 (65.57.61.217)
Hi Bill! Just an FYI: If you double-click on any of the driver parameters, it will allow you to enter T/S specs rather than horn specs. And you're right about HF performance in that it only calculates .......
148: High Efficiency Speaker Asylum, Horn Gain (0.00)
Posted by Wayne Parham on 2003-03-30, 23:58:36 (67.30.64.15)
Hi Dennis! Sorry in my earlier reply , I neglected to reference your post called " Horn Gain ." I remember reading it now and thinking you had discussed all the relevant issues pretty well. Easy to u .......
149: High Efficiency Speaker Asylum, Re: Diff'rent strokes (0.00)
Posted by Wayne Parham on 2003-03-30, 19:25:09 (67.28.90.29)
Hi Duke! Ha! Love your binary badinage! Wayne .......
150: High Efficiency Speaker Asylum, Re: Can someone please help me find an article... (0.00)
Posted by Wayne Parham on 2003-03-30, 15:33:13 (67.28.90.29)
Hi Charles! You wrote: >> A few months ago, I was surfing on the web and found a reference >> to some article that basically stated that horn efficiency was a >> myth and really due to the increased d .......
151: High Efficiency Speaker Asylum, Horns, diffraction slots and astigmatism (0.00)
Posted by Wayne Parham on 2003-03-29, 04:19:28 (65.57.63.125)
John - I suggest you peruse the posts on the π Speakers forum about diffraction . There you will find a lot of useful information on this subject, including a link to the papers written by and abo .......
152: High Efficiency Speaker Asylum, Re: Conical horn coverage? (0.00)
Posted by Wayne Parham on 2003-03-28, 15:21:25 (65.56.168.103)
John - There is rapid discontinuity at the horn mouth, where there is a transition from a highly constrained space to open freespace or halfspace if baffle mounted. This causes diffraction and widens .......
153: High Efficiency Speaker Asylum, Re: Conical horn coverage? (0.00)
Posted by Wayne Parham on 2003-03-28, 12:53:11 (65.56.168.103)
John - The horn mouth begins to act as a single-slit diffraction slot at lower frequencies, widening the pattern. Diffraction is the reason for that behaviour. Wayne .......
154: High Efficiency Speaker Asylum, Helmholtz formula (0.00)
Posted by Wayne Parham on 2003-03-28, 00:29:56 (67.30.65.224)
Hello! Here's a link containing the Helmholtz formula . You can use this formula to find the desired port length when cabinet volume and port diameter are fixed. Or, for that matter, you can modify ca .......
155: High Efficiency Speaker Asylum, Re: Conical horn coverage? (0.00)
Posted by Wayne Parham on 2003-03-27, 12:50:34 (67.30.65.224)
Hi Dejan! You wrote: >> What is the coverage of mid/high freq conical horns? Above the frequency range discussed below, it is determined simply by the angle of the walls of the horn. >> where is the p .......
156: High Efficiency Speaker Asylum, Re: Opinions wanted: distance of woofer from horn tweeter (0.00)
Posted by Wayne Parham on 2003-03-25, 00:26:56 (67.75.182.247)
John - What we're talking about here is two sound sources that each generate a similar signal. That essentially forms two-slit diffraction. If the distance between them and the listener is fixed, then .......
157: High Efficiency Speaker Asylum, Re: Opinions wanted: distance of woofer from horn tweeter (0.00)
Posted by Wayne Parham on 2003-03-24, 15:03:49 (65.57.61.10)
Exactly .......
158: High Efficiency Speaker Asylum, Re: Bottom octave performance (0.00)
Posted by Wayne Parham on 2003-03-24, 12:34:56 (65.57.61.10)
Mark - You wrote: >> If you feel parts of my post were so dreadfully promotional, >> please have the moderators edit or remove the post. How about you simply refrain from this kind of activity so that .......
159: High Efficiency Speaker Asylum, Re: Opinions wanted: distance of woofer from horn tweeter (0.00)
Posted by Wayne Parham on 2003-03-24, 12:29:13 (65.57.61.10)
John - You wrote: >> Putting the woofer up high near the horn minimizes lobing in the >> vertical plane. That's right, exactly. >> The frequency and slope of the crossover will entirely determine >> t .......
160: High Efficiency Speaker Asylum, Bottom octave performance (0.00)
Posted by Wayne Parham on 2003-03-23, 16:22:04 (65.57.61.10)
Mark - This forum is not a place for commercial exploitation, and it is expressed in the posting rules for manufacturers and dealers. It says, in bold, "the Asylum is not the place for self promotion .......
161: High Efficiency Speaker Asylum, Re: Opinions wanted: distance of woofer from horn tweeter (0.00)
Posted by Wayne Parham on 2003-03-23, 16:13:50 (65.57.61.10)
I think the question is raised about vertical offset, not horizontal. As such, the difference in distance between each radiator and the listener will be the same on-axis as it will be at all points on .......
162: High Efficiency Speaker Asylum, www.WoodHorn.com (0.00)
Posted by Wayne Parham on 2003-03-19, 12:41:02 (65.57.62.185)
Hi Scott! Check out Bill Martinelli's site, www.WoodHorn.com . He's got radial wood horns, plans, tons of stuff over there. And he uses a machined billet driver mounting plate with an O-Ring for a sea .......
163: High Efficiency Speaker Asylum, LAB vs. Quad-18 at 30Hz (0.00)
Posted by Wayne Parham on 2003-03-13, 01:43:14 (67.28.93.29)
Hello again Tom! I just re-read your reply where you quoted me saying: "I suspect that this four woofer combination would generate about 135dB at 100Hz at one meter and at full power. This is about th .......
164: High Efficiency Speaker Asylum, Re: Overkill with basshorns in my room? (0.00)
Posted by Wayne Parham on 2003-03-12, 15:58:57 (67.28.93.29)
Hi Steve! You wrote: >> One thing I did with my design was to place the back chamber up >> near the ceiling, with the driver firing down into a triangular >> cross section horn... That's cool stuff, S .......
165: High Efficiency Speaker Asylum, Re: Low-order and high-order crossovers (0.00)
Posted by Wayne Parham on 2003-03-09, 17:23:50 (67.75.182.103)
Hi Paul! I didn't intend to make the driver/horn combo a mystery, it's just that I wanted to be objective by not using a particular brand reference because the same issues occur on every compression h .......
166: High Efficiency Speaker Asylum, Re: Low-order and high-order crossovers (0.00)
Posted by Wayne Parham on 2003-03-08, 01:12:22 (63.208.40.17)
Hi Greg! You wrote: >> Is first order really even possible in this situation? It seems >> like a 'first order' crossover at 500 in a 300 hz horn would give >> you a initial first order crossover @ 500 .......
167: High Efficiency Speaker Asylum, Low-order and high-order crossovers (0.00)
Posted by Wayne Parham on 2003-03-07, 15:12:19 (67.30.70.6)
Hi Ron! There are advantages and disadvantages to low-order and high-order crossovers, but I've moved away from first-order filters on horns for the most part. They allow too much out-of-band energy w .......
168: High Efficiency Speaker Asylum, Re: No "spin" (0.00)
Posted by Wayne Parham on 2003-03-06, 21:24:15 (63.208.40.181)
Hi John! I understand that you like these Eminence drivers, and that they have worked well for you in a bass-reflex cabinet and also in a basshorn of some sort. I further understand that you purchased .......
169: High Efficiency Speaker Asylum, No "spin" (0.00)
Posted by Wayne Parham on 2003-03-06, 15:09:37 (63.208.40.181)
Hi Tom! The " Quotes of the Day " were included with links to the source, so it is easy to see them taken fully in context. It is interesting to note John's impression that the Eminence woofer outperf .......
170: High Efficiency Speaker Asylum, Quotes of the Day (0.00)
Posted by Wayne Parham on 2003-03-06, 00:15:02 (63.208.45.83)
John Inlow - " I can give the bass horn more gain and it still won't out perform the LAB 12 in the bass reflex enclosure! " Tom Danley - " In room, it is unusually smooth for a small horn + - 3 dB fro .......
171: High Efficiency Speaker Asylum, Cornerhorns! (0.00)
Posted by Wayne Parham on 2003-03-05, 16:16:05 (63.208.45.83)
Hi James! You wrote: >> Can provide me, or direct me to basic information on cornerhorns? Some designs use the corner of a room as an extension to the horn formed by chambers within the cabinet. Other .......
172: High Efficiency Speaker Asylum, Re: Solution indicated by conditions (0.00)
Posted by Wayne Parham on 2003-03-04, 15:50:17 (63.208.45.83)
Hello again Tom! Let's see how many more times we can each say the same thing. You wrote: >> I suggested using a modern math / horn / driver design >> and this would result in far better performance. .......
173: High Efficiency Speaker Asylum, Re: 1st Order Series, with a twist. (0.00)
Posted by Wayne Parham on 2003-03-04, 01:42:08 (65.57.58.12)
Hi Jon! You wrote: >> I am very much strapped for funds for non-essential expenses. >> Still paying off a college gig, as well as a wedding! Thus I >> am not at liberty to travel without VERY good rea .......
174: High Efficiency Speaker Asylum, Re: Solution indicated by conditions (0.00)
Posted by Wayne Parham on 2003-03-04, 01:34:15 (65.57.58.12)
Hello! What is your relationship to this project, and to Tom Danley? I see that you are a manufacturer, and I sense that you tend to feel somewhat defensive of the LAB horn design. I also can't help b .......
175: High Efficiency Speaker Asylum, Solution indicated by conditions (0.00)
Posted by Wayne Parham on 2003-03-03, 13:00:59 (65.57.58.12)
Hello! You wrote: >> If the job was yours and you were asked to design (like Tom did) >> a subwoofer for maximum 30-150 cycle reproduction, to be used >> under the circumstances that the LAB Horn was .......
176: High Efficiency Speaker Asylum, Re: Eminence LAB 12 drivers (0.00)
Posted by Wayne Parham on 2003-03-03, 09:51:42 (65.57.63.76)
Hello again Tom! You wrote: >> To save time I will re-state the points I was trying to make that >> seem to have gotten lost. Your points were not "lost." The posts you made are all still right here. .......
177: High Efficiency Speaker Asylum, Re: Eminence LAB 12 drivers (0.00)
Posted by Wayne Parham on 2003-03-02, 22:11:53 (65.57.63.76)
Hello again John! You wrote: >> The thump I get from the horn is capable of rattling my ribs, >> the reflex doesn't. The reflex does sound magnificient, but >> without the acoustic power. Man, do I li .......
178: High Efficiency Speaker Asylum, Re: Eminence LAB 12 drivers (0.00)
Posted by Wayne Parham on 2003-03-02, 15:45:57 (65.57.63.76)
Hi John! Here's the point. You started this thread by saying that you were amazed with the performance of these Eminence woofers in a bass-reflex box. My suggestion is that you might consider keeping .......
179: High Efficiency Speaker Asylum, Re: 1st Order Series, with a twist. (0.00)
Posted by Wayne Parham on 2003-03-02, 13:12:53 (65.57.63.76)
Hi Jon! I've looked over your work with interest. I appreciate the fact that you've observed some of the issues that arise when the reactive nature of the speaker motor is included in the crossover ci .......
180: High Efficiency Speaker Asylum, Re: Eminence LAB 12 drivers (0.00)
Posted by Wayne Parham on 2003-03-01, 20:42:18 (65.57.63.76)
Hello Tom! You wrote: >> I think your confused, the measurement I was referring to in my >> post was the higher resolution measurement, the one called >> 1MGPFRAlab.jpg, not the low res normalized res .......
181: High Efficiency Speaker Asylum, Re: Eminence LAB 12 drivers (0.00)
Posted by Wayne Parham on 2003-03-01, 13:40:00 (65.57.63.76)
Hello Tom! I wrote: "All products that were represented performed well. The LAB Sub appears to be satisfactory, as were all the others. But all products were also beginning to rolloff at 40 Hz, with n .......
182: High Efficiency Speaker Asylum, Congratulations! (0.00)
Posted by Wayne Parham on 2003-03-01, 13:31:44 (65.57.63.76)
Hi Eso! Congratulations to you and your wife!!! Wayne .......
183: High Efficiency Speaker Asylum, Re: Eminence LAB 12 drivers (0.00)
Posted by Wayne Parham on 2003-03-01, 00:42:37 (65.57.63.76)
Hello again Tom! You wrote: >> At some point, the folks who did a shoot out in Michigan will >> have the measurements and listening results posted on the basslist >> so more actual data will be availa .......
184: High Efficiency Speaker Asylum, Re: Eminence LAB 12 drivers (0.00)
Posted by Wayne Parham on 2003-02-28, 15:54:16 (65.57.63.76)
Hi Tom! You wrote: >> Part of the reason for my designing the LAB horn and specifying >> the driver parameters was to give the Pro-sound DIY'rs a modern >> bass horn, so many people interested in horn .......
185: High Efficiency Speaker Asylum, Radial horns (0.00)
Posted by Wayne Parham on 2003-02-23, 02:54:43 (63.208.40.7)
Hi Adrian! Let's take this discussion over to the π Speakers forum . Please see my reply to you there in the post called " Radial horns ." Take care! Wayne .......
186: High Efficiency Speaker Asylum, Re: Resonant horns and transmission horns. (0.00)
Posted by Wayne Parham on 2003-02-20, 17:09:21 (63.208.40.7)
Hi Paul! Thanks for explaining with the reference to the previous post and the discussion in Merrillville. Now I see what you're talking about, and that you've looked at techniques used in musical ins .......
187: High Efficiency Speaker Asylum, Resonant horns (0.00)
Posted by Wayne Parham on 2003-02-20, 01:39:29 (63.208.40.7)
Hi Paul! I noticed that the site Mike posted makes a lot of references to the work of acoustician Dr. Arthur Benade , who is very influential in the musical instrument manufacturing community. I've be .......
188: High Efficiency Speaker Asylum, Godspeed (0.00)
Posted by Wayne Parham on 2003-02-18, 00:38:59 (67.75.183.162)
Hi Bruce! Godspeed with your recovery. Wayne .......
189: High Efficiency Speaker Asylum, Re: LC Peaking (0.00)
Posted by Wayne Parham on 2003-02-17, 12:36:40 (67.75.183.162)
Hello! Thanks for your input. I still suggest first-order networks for a few applications, but on drivers with anything but ultra-low inductance in the crossover region - which is very wide on low-ord .......
190: High Efficiency Speaker Asylum, Re: LC Peaking (0.00)
Posted by Wayne Parham on 2003-02-17, 12:10:49 (67.75.183.162)
Hi Paul! This is an often overlooked issue, and you're right that it's a concept worth exploring. I've long wondered why it doesn't get more attention. Particularly since midrange horns are often used .......
191: High Efficiency Speaker Asylum, LC Peaking (0.00)
Posted by Wayne Parham on 2003-02-16, 16:53:14 (67.75.183.162)
Hi guys! I'm certain that most agree we want our speakers not to add sound, but rather to simply reproduce it. I also think that some distortions are more noticeable to our ears than others, and so wh .......
192: High Efficiency Speaker Asylum, Godspeed (0.00)
Posted by Wayne Parham on 2003-02-13, 00:41:26 (63.208.40.14)
Hello Eso and Bruce! I could send word via E-Mail, but he'll see it here soon enough. Best wishes for a speedy recovery. Wayne .......
193: High Efficiency Speaker Asylum, Comparison of conical, exponential and tractrix horns (0.00)
Posted by Wayne Parham on 2003-02-12, 13:02:03 (63.208.40.14)
Hello again Terry! Please forgive the intrusion on your discussion with Tom, but this information is germane to the subject and I think you may find it interesting. About EQ for tractrix and exponenti .......
194: High Efficiency Speaker Asylum, Re: Horn EQ compensation (0.00)
Posted by Wayne Parham on 2003-02-12, 12:55:34 (63.208.40.14)
Hi Terry! I have found that tractrix horns measure very similarly to comparibly sized exponential horns, from about an octave above the flare rate. Below this point, the tractrix horn tends to roll of .......
195: High Efficiency Speaker Asylum, Re: LC Peaking (0.00)
Posted by Wayne Parham on 2003-02-10, 16:34:44 (67.75.182.198)
John - Will received a serious answer. My suggestion that series capacitance forms a resonant circuit with voice coil inductance is not some sort of idle chatter - It's a fact. Perhaps you would acce .......
196: High Efficiency Speaker Asylum, Re: LC Peaking (0.00)
Posted by Wayne Parham on 2003-02-09, 21:12:04 (67.75.182.198)
Hello Will! You wrote: >> Would it then also be true that the common practice of adding the >> natural acoustical rolloff of the horn (say -12dB) and the rolloff of >> the xover (in our case only -6dB .......
197: High Efficiency Speaker Asylum, Re: LC Peaking (0.00)
Posted by Wayne Parham on 2003-02-09, 21:03:01 (67.75.182.198)
Hello John! You wrote: >> Regions with a slope of 6dB per octave exhibit 90 degrees of phase >> shift, 12dB per octave--180 degrees, 18dB--270 degrees and so on. The phase shift of a first-order filte .......
198: High Efficiency Speaker Asylum, Re: LC Peaking (0.00)
Posted by Wayne Parham on 2003-02-08, 00:10:25 (65.56.174.115)
Hello again Bruce! You wrote: >> There are many peaks down in that region, primarily due to >> impedance peaks of the horn. That's right. And since a first-order high-pass network passes significant e .......
199: High Efficiency Speaker Asylum, LC Peaking (0.00)
Posted by Wayne Parham on 2003-02-07, 01:18:34 (67.75.179.31)
Hello Bruce! You wrote: [a recommendation of crossovers for midrange horns] >> Just use 1st order crossovers. For a midrange driver a high >> quality cap is all that is needed. Higher order xovers don .......
200: High Efficiency Speaker Asylum, Who were married? (0.00)
Posted by Wayne Parham on 2003-01-27, 23:29:35 (65.56.174.180)
Hello! Nice story, thanks! It brings a nice image into my mind and this is the kind of thing I like to see most. Who are the couple that had the wedding, if you don't mind saying? Perhaps your reply w .......
201: High Efficiency Speaker Asylum, Voice of the Theater vs. Voice of the Nouveau Riche (0.00)
Posted by Wayne Parham on 2003-01-27, 00:26:27 (65.56.174.180)
Hi Charlie! I felt led to add my two cents worth here. You paraphrased my comments about your Altec's perfectly. And I think the same thing applies to lots of other speakers, both old and new. You kno .......
202: High Efficiency Speaker Asylum, Re: Speaker Wiring Losses (0.00)
Posted by Wayne Parham on 2003-01-26, 13:44:28 (65.56.174.180)
Hi Charlie! There are some interesting links in this previous post . I think you'll appreciate the information contained in them. Take care! Wayne .......
203: High Efficiency Speaker Asylum, Red herrings (0.00)
Posted by Wayne Parham on 2003-01-26, 00:08:02 (65.56.174.180)
Hello there mister X! I agree with you in many ways. I've found it pleasant to refrain from the debate club here lately. Too many things to do that are substantive to engage in discussions that aren't .......
204: High Efficiency Speaker Asylum, Klippel definitions and virtual circuits (0.00)
Posted by Wayne Parham on 2003-01-02, 11:33:44 (65.57.61.177)
Hello John! Klippel has focused on woofers and defines their non-linear properties in his work. The motor's inductance curve is defined and modeled using virtual circuits . So you might be interested .......
205: High Efficiency Speaker Asylum, Non-linear properties (0.00)
Posted by Wayne Parham on 2003-01-01, 15:21:18 (65.57.61.177)
Hello John! Happy New Years! You will not be able to model the inductance of a voice coil loudspeaker using a simple differential equation unless you are happy with a simple model. But you can model i .......
206: High Efficiency Speaker Asylum, Re: some thoughts on harmonic distortion measures (0.00)
Posted by Wayne Parham on 2002-12-29, 12:26:07 (65.57.61.177)
Hello John! I think you may have overlooked the obvious, which is that loudspeaker harmonic distortion components are predominantly mechanico-acoustic in nature, and not electrical. Passive electrical .......
207: High Efficiency Speaker Asylum, Crossover peaking and "horn honk" (0.00)
Posted by Wayne Parham on 2002-12-29, 12:06:06 (65.57.61.177)
Hi Tom! An excellent post. You wrote: >> The familiar "honk" you refer to in PA horns is often the result >> of not having the response flat enough, which is often very >> difficult to do using a pass .......
208: High Efficiency Speaker Asylum, Re: Merry Christmas folks (0.00)
Posted by Wayne Parham on 2002-12-24, 13:33:40 (65.57.62.83)
Merry Christmas, Happy Hanukah, Pongul, etc. Best wishes to all! Wayne Parham .......
209: High Efficiency Speaker Asylum, Wow! Best Christmas Ever!!! (0.00)
Posted by Wayne Parham on 2002-12-24, 13:32:17 (65.57.62.83)
Wow! Mike! What a Story!!! Nothing else matters. Merry Christmas!!! Wayne .......
210: High Efficiency Speaker Asylum, Re: Diffraction (0.00)
Posted by Wayne Parham on 2002-12-22, 12:23:54 (65.57.58.74)
Hi Mike! You wrote: >> Have a pair of EV CD horns here that have a slit about the same >> size. Guess they're a loaded line source where the diaphram fires >> into a compression chamber, cylindrical p .......
211: High Efficiency Speaker Asylum, Diffraction (0.00)
Posted by Wayne Parham on 2002-12-22, 00:32:37 (65.57.58.74)
Hi Mike! You wrote: [about your ribbon tweeter] >> The model I'm listening to diaphram is around 7" tall and 1" across. That's why Tom is describing it as a line source. It's tall in respect to the fr .......
212: High Efficiency Speaker Asylum, Re: Do I hear an "Amen brother!" (0.00)
Posted by Wayne Parham on 2002-12-22, 00:26:29 (65.57.58.74)
Hi Tom! Man, I love the Onion ! Wayne .......
213: High Efficiency Speaker Asylum, Do I hear an "Amen brother!" (0.00)
Posted by Wayne Parham on 2002-12-21, 23:40:53 (65.57.58.74)
Hi Mike! You're hearing a loud "Amen" from me. The solution seems very simple, doesn't it? Freedom of speech? Sure. But there's a lot of other freedoms too, like the freedom to erase a file, shut down .......
214: High Efficiency Speaker Asylum, Pro's and con's (0.00)
Posted by Wayne Parham on 2002-12-21, 14:48:59 (65.57.58.74)
Hi guys! Tom, don't misinterpret my comments about HF ribbons. I was fascinated by them, and I found them to sound very good. The Infinity EMIT is an excellent sounding device, in my opinion. But I've .......
215: High Efficiency Speaker Asylum, Re: Axial phase characteristics of horns (0.00)
Posted by Wayne Parham on 2002-12-21, 13:15:35 (65.57.58.74)
Hi Tom! You are correct about the diaphragm of a compression driver having a first significant resonant mode around 8kHz-10kHz, that's very common. This behaviour improves the performance of these dev .......
216: High Efficiency Speaker Asylum, Re: Breakup of a Ribbon (0.00)
Posted by Wayne Parham on 2002-12-21, 13:06:40 (65.57.58.74)
Hi Mike! Ha! Remember the old Mazda Wankle engine commercials of the 70's? "Piston engine goes boom-da-da-boom-da-da-boom... and the Mazda goes hmmmmmmm." I like my cammed big blocks, but I've built s .......
217: High Efficiency Speaker Asylum, Re: Axial phase characteristics of horns (0.00)
Posted by Wayne Parham on 2002-12-20, 12:41:45 (63.208.62.213)
Hi John! There is one problem. It's an academic problem, but then again, this is an academic discussion. And so the consequences of all this are really a matter of interpretation. But since the diaphr .......
218: High Efficiency Speaker Asylum, Electrical, mechanical and acoustic devices in the system (0.00)
Posted by Wayne Parham on 2002-12-19, 15:31:41 (67.28.95.45)
Hi guys! I think that the issue has been touched on in its various components, and that to summarize, we have four main components of a loudspeaker horn: 1. The motor 2. The diaphragm 3. The flare 4. .......
219: High Efficiency Speaker Asylum, Re: Mass corner and rising response ? (0.00)
Posted by Wayne Parham on 2002-12-18, 23:09:46 (65.56.172.197)
Hi Bruce! I've always treated the horn's participation somewhat like Leach does, in that I think of it as a filter. This view gives each horn a characteristic response curve that can be algebraically .......
220: High Efficiency Speaker Asylum, Re: the proof being in the pudding- (0.00)
Posted by Wayne Parham on 2002-12-18, 22:58:49 (65.56.172.197)
Hi Tom! You wrote: [about crossover within a Unity horn] >> The problem is trying to crossover higher than about 1500 Hz >> requires an increasingly more difficult and precise physical >> constraint a .......
221: High Efficiency Speaker Asylum, Re: the proof being in the pudding- (0.00)
Posted by Wayne Parham on 2002-12-18, 16:16:44 (65.56.172.197)
Hi Tom! I assume you crossover from midrange to compression driver before this point on the Unity, yes? Not to start a flame-fest, but it is a more difficult proposition between woofer and midrange on .......
222: High Efficiency Speaker Asylum, Re: the proof being in the pudding- (0.00)
Posted by Wayne Parham on 2002-12-18, 04:00:28 (63.208.63.125)
Hi Bill! I don't know what configuration your systems use, but I'll tell you about mine and you can decide if there's any useful connection for you. I build some speaker models that use a midbass horn .......
223: High Efficiency Speaker Asylum, Re: Mass corner and rising response ? (0.00)
Posted by Wayne Parham on 2002-12-17, 14:45:16 (63.208.63.125)
Hi DJK! They say "a picture is worth a thousand words," and so I'd like to suggest Augsperger's " JBL Sound System Design Reference Manual ". In this document, there are response graphs that illustra .......
224: High Efficiency Speaker Asylum, Re: Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-16, 11:29:14 (63.208.63.125)
Hi Tom - You're still doing what looks like just a bunch of "arm waving." It is P.T. Barnum style stuff when you do that, just like bringing up past grant work experiments and times in the pyramid. Th .......
225: High Efficiency Speaker Asylum, Re: Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-16, 02:00:02 (63.208.63.125)
John, My explaination to Frank of the performance of conical horns was enough. It looks to me like subsequent posts were not done in a spirit of helpfulness, but rather just to be argumentative. Frank .......
226: High Efficiency Speaker Asylum, Re: Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-16, 01:58:54 (63.208.63.125)
John, My explaination to Frank of the performance of conical horns was enough. It looks to me like subsequent posts were not done in a spirit of helpfulness, but rather just to be argumentative. Frank .......
227: High Efficiency Speaker Asylum, Directivity Index (0.00)
Posted by Wayne Parham on 2002-12-15, 21:30:34 (63.208.63.125)
Hi Frank! You wrote: >> What is DI? It is directivity index and is an indicator of the ratio of energy from a horn on a given axis to that of an omnidirectional source. Horns with constant directivity .......
228: High Efficiency Speaker Asylum, Re: Doubt that there's "new and unpublished data" on a topic as old and well-researched as conical h (0.00)
Posted by Wayne Parham on 2002-12-15, 19:42:08 (63.208.63.125)
John, Your post is the kind of thing that ensures our respective views stay polarized. I've grown to expect it from the Unity camp. So, in the spirit of your last post, where are the plans for the Uni .......
229: High Efficiency Speaker Asylum, Re: Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-15, 19:10:38 (63.208.63.125)
John, I don't insinuate anything except to describe the behaviour of the system. All compression devices roll off pretty low, and that exacerbates the problem. But even beyond that, without some mecha .......
230: High Efficiency Speaker Asylum, Re: Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-15, 18:44:00 (63.208.63.125)
John, You wrote: >> The combination of a driver with a power response that rolls off >> at high frequencies with a conical horn (which gives flat power >> response) is what produces the 'negative slop .......
231: High Efficiency Speaker Asylum, Re: Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-15, 18:39:13 (63.208.63.125)
John, You wrote: >> The use of a certain driver on this type of horn generates >> a 'negative slope'. By itself, the horn only generates a flat >> power response. No. "By itself" a horn generates noth .......
232: High Efficiency Speaker Asylum, Re: Conical horns - A matter of perspective (0.00)
Posted by Wayne Parham on 2002-12-15, 18:33:20 (63.208.63.125)
Hello Mark, You wrote: >> If we step far enough back, both perspectives could be >> considered "correct" yet understanding in terms of power >> response more directly correlates to the observed result .......
233: High Efficiency Speaker Asylum, Re: Doubt that there's "new and unpublished data" on a topic as old and well-researched as conical h (0.00)
Posted by Wayne Parham on 2002-12-15, 16:01:28 (63.208.63.125)
Tim, That was way, way out of line. My papers are extensive and show exactly what I recommend and why. Formulas, schematics and response charts. This is in contrast with the lack of any such documenta .......
234: High Efficiency Speaker Asylum, Re: Doubt that there's "new and unpublished data" on a topic as old and well-researched as conical h (0.00)
Posted by Wayne Parham on 2002-12-15, 14:18:08 (63.208.63.125)
Tom - Your attacks and those by your associates are obvious and transparent. It appears that you take issue solely to bring attention to yourself, a P.T. Barnum technique. See you in Lima. Wayne ::: T .......
235: High Efficiency Speaker Asylum, Re: Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-15, 13:45:38 (63.208.63.125)
John - I described the behaviour of the system, it is an accurate observation. This is further reflected in the words of most of the people who have objected on this thread. Tom Danley uses EQ to aug .......
236: High Efficiency Speaker Asylum, Re: Doubt that there's "new and unpublished data" on a topic as old and well-researched as conical h (0.00)
Posted by Wayne Parham on 2002-12-15, 13:12:55 (63.208.63.125)
John - Radiation impedance is not at issue here. A horn's participation in system performance isn't solely a function of its acoustic impedance. Its dispersion pattern is important too and is, in fact .......
237: High Efficiency Speaker Asylum, Re: Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-15, 13:01:19 (63.208.63.125)
Tom - Do not patronize me any further. The exponential horn does not need EQ for its on-axis response to be flat. The conical horn does - It needs augmentation of the top octave. So you can describe D .......
238: High Efficiency Speaker Asylum, Re: Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-15, 12:59:54 (63.208.63.125)
Tim - The exponential horn does not need EQ for its on-axis response to be flat. The conical horn does - It needs augmentation of the top octave. So you can describe DI or you can show response curves .......
239: High Efficiency Speaker Asylum, Re: Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-14, 22:11:59 (63.208.63.125)
Hi Tom! I'm sure you are pretty aware of the underlying issues here, since you've alluded to some of them. But I think it is important to revisit them briefly, since you've brought it up. As for the h .......
240: High Efficiency Speaker Asylum, Re: Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-14, 21:37:27 (63.208.63.125)
Hello Tom, You wrote: >> I was however correcting something which you said that is wrong, >> that the conical horn has some kind of "negative slope" somewhere, >> it does not. One look at the response .......
241: High Efficiency Speaker Asylum, Re: Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-14, 21:06:22 (63.208.63.125)
Hi Eso! No offense taken. Fair enough. But I must remind you of two things: 1. I've been doing work with conical horns of various sizes for 25 years, and 2. It is common knowledge that conical horns r .......
242: High Efficiency Speaker Asylum, Re: Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-14, 13:23:21 (63.208.63.125)
Hello Tom, It looks to me like the main purpose of your "clarification" is be argumentative. This is exactly the kind of thing that makes me want to jump all over you when you exaggerate issues or boa .......
243: High Efficiency Speaker Asylum, Conical horns - Man's oldest acoustic device (0.00)
Posted by Wayne Parham on 2002-12-13, 23:58:49 (63.208.63.125)
Hi Sauer! The conical horn is undoubtedly the oldest man-made acoustic device. Its main strengths are simplicity, constant directivity and low distortion. Other shapes do a better job at the lowest fr .......
244: High Efficiency Speaker Asylum, Re: Crossovers and damping filters (0.00)
Posted by Wayne Parham on 2002-12-11, 23:37:39 (67.28.88.62)
Hi Randy! You wrote: >> I read the crossover document, and was very happy to find the >> section which said if there is a 1st order on the woofer, you >> don't need a zobel, and you don't need a zobel .......
245: High Efficiency Speaker Asylum, Re: Crossovers and damping filters (0.00)
Posted by Wayne Parham on 2002-12-11, 01:05:37 (67.28.88.62)
Hi Greg! You wrote: >> I have noticed that with 3rd order filters they almost always >> sound better with a small resistance added to the shunt leg, >> like and ohm or two or even a very small gauge a .......
246: High Efficiency Speaker Asylum, Crossovers and damping filters (0.00)
Posted by Wayne Parham on 2002-12-11, 00:13:09 (67.28.88.62)
Hi guys! Just thought maybe my two cents might be good here. I love the simple first order crossovers, and they're great for a lot of things. Simplicity, purity, low phase shift and not a lot things i .......
247: High Efficiency Speaker Asylum, Re: CAR T-1s DIY clone? (0.00)
Posted by Wayne Parham on 2002-12-10, 16:05:44 (67.28.88.62)
Hi Dusan! You wrote: >> I'm into building my new pair of speakers using TAD drivers. I'm >> thinking to use TL1601b, TD4001 with 300 Hz DIY radial horn and >> ET-703 supertweeter - all drivers that Cl .......
248: High Efficiency Speaker Asylum, Electrical, mechanical and acoustic filters (0.00)
Posted by Wayne Parham on 2002-12-10, 12:26:25 (67.28.88.62)
Hello again Citroeniste! You wrote: >> My point was that the F3 is irrelevant (assume we're talking about >> something below ~80Hz) because first room modes and then room >> boost will have their way .......
249: High Efficiency Speaker Asylum, Re: Sealed vs. vented (0.00)
Posted by Wayne Parham on 2002-12-09, 01:26:04 (67.28.88.62)
Hello Citroeniste! You wrote: [in reply to my statement, "A sealed box has less bass extension than a vented box using the same motor" ] >> Most of the woofers I have modelled do have a higher anechoi .......
250: High Efficiency Speaker Asylum, Re: Choice of hi-eff 15" (for use below Edgar midhorn) (0.00)
Posted by Wayne Parham on 2002-12-09, 00:16:04 (67.28.88.62)
Hello Claes, Eso and Tom. I'd like to offer a few more points to this thread. Tom wrote: [about sealed boxes] >> You would be amazed how much is down low and how much less group >> delay this has than .......
251: High Efficiency Speaker Asylum, Re: OK High-Efficiency folks, what cables do you use? (0.00)
Posted by Wayne Parham on 2002-12-05, 11:30:27 (63.208.61.33)
Hi Bosh! I like a good "standard" speaker wire, such as a stranded pair of appropriate size for the distance and load. There are links to cable manufacturer's specifications in the post called " Speak .......
252: High Efficiency Speaker Asylum, Maybe midrange cone drivers instead (0.00)
Posted by Wayne Parham on 2002-12-04, 02:13:54 (63.208.61.33)
Hi Paul! I prefer medium format (cone) midrange units to compression devices for the 200Hz to 2kHz midrange frequency band. It's only an octave on either side to extend this to 100Hz to 4kHz, and they .......
253: Bottlehead Forum, Hooray! (0.00)
Posted by Wayne Parham on 2002-11-28, 01:33:21 (65.56.172.53)
Hi Dan! Hooray - Sounds like I'll be getting a shipment from you sometime soon!!! Have a great Thanksgiving! Wayne Parham .......
254: High Efficiency Speaker Asylum, Re: How many versions of the Unity crossover have been introduced? (0.00)
Posted by Wayne Parham on 2002-11-27, 22:32:51 (65.56.172.53)
Hi Tom! I hope you're set to have a great Thanksgiving! You wrote: >> As I explained before (and in the photo I sent you), my Moog Does >> have Both sawtooth waveshapes and my conclusion was that it s .......
255: High Efficiency Speaker Asylum, How many versions of the Unity crossover have been introduced? (0.00)
Posted by Wayne Parham on 2002-11-27, 14:03:03 (65.56.172.53)
Hi Tom! How many versions of crossovers have been produced for Unity speakers? Wasn't the original issue supposed to have been a claim of phase correction, i.e. time alignment? I mean, if you claimed .......
256: DIY HiFi Forum, Re: His spirit lives on.......... (0.00)
Posted by Wayne Parham on 2002-11-27, 13:22:07 (65.56.172.53)
Hi Craig! Wow - I'm really sorry to hear about that. He was a customer and I felt like we were "kindred spirits." Any time a "flame-fest" would erupt on HE, he would write me in support. We always tal .......
257: DIY HiFi Forum, Hi Brian! Hi Kevin!!! (0.00)
Posted by Wayne Parham on 2002-11-26, 22:30:49 (65.57.58.218)
Hi Brian! It's been a long time. Are you still working with Stanley Chu? Good to see you here as a sponsoring forum! And Hi Kevin! Great to see you here too - I've heard nothing but good things about .......
258: High Efficiency Speaker Asylum, Re: Why even try? (0.00)
Posted by Wayne Parham on 2002-11-26, 17:08:06 (65.57.58.218)
Hi Mike! I'm sure that the thing most describe as "speed" is related to damping and overring. Low harmonic distortion sounds "tighter" too, but I'm confident the main thing is system damping. It canno .......
259: High Efficiency Speaker Asylum, time delay/ mid high horn design (0.00)
Posted by Wayne Parham on 2002-11-24, 15:35:36 (65.57.57.159)
Hello! You wrote: >> say I make a 15-20ft long basshorn---- how can I delay my direct >> radiating subs/mid/highs so they play in phase As has been pointed out to you, use a delay line. They have beco .......
260: High Efficiency Speaker Asylum, Systemic behaviour (0.00)
Posted by Wayne Parham on 2002-11-15, 16:07:31 (65.57.60.147)
Hi Jag! You wrote: >> And then i have another question: when you simulate different 18" >> drivers, they kinde look the same. But i know out of experience >> that different drivers sound quite differe .......
261: High Efficiency Speaker Asylum, Re: "Looks -VS- Sound" question (0.00)
Posted by Wayne Parham on 2002-11-15, 12:41:15 (65.57.60.147)
Hi Tom! I see no reason that being aesthetically pleasant and acoustically pleasant should be mutually exclusive. It seems to me that acoustic shapes and proportions that work well are also attractive .......
262: High Efficiency Speaker Asylum, The three that they ask for (0.00)
Posted by Wayne Parham on 2002-11-14, 20:57:16 (65.57.60.147)
Hi Mike! If I were truly wanting to let someone evaluate a sound system, I'd let 'em pick out what they wanted to hear. They would be more familiar with the material that way. If I'm listening critica .......
263: High Efficiency Speaker Asylum, Ouch! Yikes! "Two bits worth" (0.00)
Posted by Wayne Parham on 2002-11-13, 15:39:18 (65.57.60.147)
Hi Jag! You wrote: [about building your loudspeakers] >> The guy who helped me, even lost two fingers during the sawing. Yikes! That's really putting in his "two bits worth!" That was terrible humor, .......
264: High Efficiency Speaker Asylum, Another poll - Old school or new school? (0.00)
Posted by Wayne Parham on 2002-11-09, 12:52:34 (63.52.128.115)
Hello world! I have another poll. How many of us are running SET tube systems, and how many of us are running high power? Also, would you rather have low component count or the ability to add tone con .......
265: High Efficiency Speaker Asylum, Re: You asked for it (0.00)
Posted by Wayne Parham on 2002-11-07, 18:16:48 (63.52.150.132)
John - Your complaints fall upon deaf ears here. You have been consistently rude and have made it your own personal crusade to call me a fraud, yet my design philosophies about phase and speaker place .......
266: High Efficiency Speaker Asylum, Re: Linkwitz views on the subject (0.00)
Posted by Wayne Parham on 2002-11-07, 17:31:21 (63.52.150.132)
Hello again Tom! You wrote: >> I'm sorry, I took your posting of his write up as if it were >> suppose to be something supporting your argument to the effect >> that "all this concern over time / phas .......
267: High Efficiency Speaker Asylum, You asked for it (0.00)
Posted by Wayne Parham on 2002-11-07, 02:07:08 (63.52.130.193)
John - Let me clue you in on something. I've designed massively parallel processor cards based on the Inmos T800 processor, and I've done fiberglass runs in the thousands. Each node has optional digit .......
268: High Efficiency Speaker Asylum, Re: the drivers are summing flat (0.00)
Posted by Wayne Parham on 2002-11-07, 00:52:53 (63.52.130.193)
John - The points I made are that: 1. 360 degrees is 8.5 inches at 1.6kHz, and there is no offset anywhere of this scale, either physical or electronic, and 2. You are of a camp that promotes displace .......
269: High Efficiency Speaker Asylum, Re: can the relative drop in level (0.00)
Posted by Wayne Parham on 2002-11-07, 00:51:32 (63.52.130.193)
John - The points I made are that: 1. 360 degrees is 8.5 inches at 1.6kHz, and there is no offset anywhere of this scale, either physical or electronic, and 2. You are of a camp that promotes displace .......
270: High Efficiency Speaker Asylum, Re: the drivers are summing flat (0.00)
Posted by Wayne Parham on 2002-11-06, 16:56:38 (63.52.129.95)
John - 360 degrees phase offset at 1.6kHz is 8.5 inches. Get out the yardstick and slide rule and you won't find that figure comes out anywhere. I realize that you're used to depending on computers fo .......
271: High Efficiency Speaker Asylum, Re: can the relative drop in level (0.00)
Posted by Wayne Parham on 2002-11-06, 16:55:31 (63.52.129.95)
John - Actually, you interpreted incorrectly because my question was purely rhetorical. I have made the case that loudspeaker phase cannot be corrected with an analog filter crossover or baffle offset .......
272: High Efficiency Speaker Asylum, Suggested reading (0.00)
Posted by Wayne Parham on 2002-11-06, 13:18:03 (63.52.129.95)
Hi Norman! I don't know if you were able to glean any useful information from this thread. So I suggest that you read what Siegfried Linkwitz says on the subject. I find his views to be an accurate a .......
273: High Efficiency Speaker Asylum, Re: Linkwitz views on the subject (0.00)
Posted by Wayne Parham on 2002-11-06, 13:12:41 (63.52.129.95)
Hello Tom! You wrote: [about the the views of Linkwitz on the subject of speaker phase performance] >> A good write up as far as it goes, his first words on the subject >> should not give you too much .......
274: High Efficiency Speaker Asylum, Linkwitz views on the subject (0.00)
Posted by Wayne Parham on 2002-11-05, 20:48:36 (63.52.150.191)
Hi Kurt! Check out what Siegfried Linkwitz says on the subject. I find his views to be an accurate assessment of the situation, without sensationalism or exaggeration. Take care! Wayne Parham ::: TOP .......
275: High Efficiency Speaker Asylum, Re: 2nd try (un-wind) (0.00)
Posted by Wayne Parham on 2002-11-05, 16:31:26 (63.52.150.148)
Hi Tom! Again, the known flaws in the Unity crossover were discussed by Mark Seaton and by some of your customers, on this forum and others. As for comparison of the π crossover, a graph is provide .......
276: High Efficiency Speaker Asylum, Re: 2nd try (at spin) (0.00)
Posted by Wayne Parham on 2002-11-05, 16:30:14 (63.52.150.148)
Hi William! Those are really stunning speakers. And I'm glad you posted this here because it illustrates my point. I'm glad you got the bugs worked out on your Unity's and I think your implementation .......
277: High Efficiency Speaker Asylum, Re: 2nd try (at spin) (0.00)
Posted by Wayne Parham on 2002-11-05, 10:14:55 (63.52.150.148)
Hi Tom! You wrote: >> I have (to you, several times, in increasing detail) explained how >> the Unity got to Nick at Lambda and why his initial version needed >> additional xo work as well as a host o .......
278: High Efficiency Speaker Asylum, Sawtooth wave experiment (0.00)
Posted by Wayne Parham on 2002-11-05, 10:02:54 (63.52.150.148)
Hi Tom! You wrote: >> Why do you think a left saw tooth would sound the same as a right >> sawtooth? Because they do sound the same. This has been shown, time and time again. >> at say 500 Hz, the tim .......
279: High Efficiency Speaker Asylum, Re: 2nd try (at spin) (0.00)
Posted by Wayne Parham on 2002-11-05, 00:47:25 (63.52.129.31)
Hello again Mark! You wrote: >> Hmm... the comment I originally quoted, "severe cancelation from >> adjacent drivers" refers to MULTIPLE drivers interfiering. That's right, yes. The Unity device has m .......
280: High Efficiency Speaker Asylum, "No spin zone" (0.00)
Posted by Wayne Parham on 2002-11-04, 23:09:37 (63.52.129.31)
Hi Mark! You wrote: >> I pose the question, where would the "severe cancelation from >> adjacent drivers" come from if it is observed when only a single >> compression driver is measured? Anomalies ca .......
281: High Efficiency Speaker Asylum, Re: can the relative drop in level (0.00)
Posted by Wayne Parham on 2002-11-04, 16:14:30 (63.52.130.224)
John - I was curious what your comment might be about the crossover flaw in the Lambda Unity's. It isn't as if I was the only person to notice it - It was a known issue. I wondered how you might comme .......
282: High Efficiency Speaker Asylum, Re: can the relative drop in level (0.00)
Posted by Wayne Parham on 2002-11-04, 13:01:53 (63.52.130.224)
John - You might address something I've been wonding about for a while. You run the Lambda Unity's don't you? What did you do to correct the crossovers on them? The Lambda Unity had a 15dB dip at 4kHz .......
283: High Efficiency Speaker Asylum, Re: Binaural delay and harmonic delay (0.00)
Posted by Wayne Parham on 2002-11-03, 14:07:37 (63.52.128.228)
Hi Tom! I wrote: "If I were to build a machine that needed to detect spatial information using binaural clues, it would use phase between sensor "ears." But it would also not need to detect harmonic t .......
284: High Efficiency Speaker Asylum, Binaural delay and harmonic delay (0.00)
Posted by Wayne Parham on 2002-11-03, 01:44:01 (63.52.129.44)
Hi guys! Just a quick note: There's quite a difference between an ability to detect very small delays between ears and an ability to detect tiny delays of harmonics in relation to a fundamental. Said .......
285: High Efficiency Speaker Asylum, John Hilliard and the IEEE (0.00)
Posted by Wayne Parham on 2002-11-01, 23:49:09 (63.52.131.84)
Hi Tom! Just for fun, I did a search of the High Efficiency forum for comments about John Hilliard , hoping to find references to that 1930's tap dancing echo problem with the ~10 foot long horns and .......
286: High Efficiency Speaker Asylum, Phase, delays and offset baffle spacing (0.00)
Posted by Wayne Parham on 2002-10-31, 21:57:32 (63.52.128.182)
Hello Norman! You wrote: [about adjacent speakers in a multi-way loudspeaker system] >> The drivers are aligned at crossover point. But not at all frequencies? That's right, they're not. Nor are they .......
287: High Efficiency Speaker Asylum, Sweet! (0.00)
Posted by Wayne Parham on 2002-10-25, 18:10:10 (63.52.129.10)
.......
288: High Efficiency Speaker Asylum, Re: crossover caps (0.00)
Posted by Wayne Parham on 2002-10-24, 18:53:34 (63.52.151.42)
Hi Michael! You wrote: >> I remember reading that article some time ago, but I think Steve >> has updated since I last visited. So if I understood the gist of >> the paper, as long as the findings hol .......
289: High Efficiency Speaker Asylum, Re: crossover caps Testing?? (0.00)
Posted by Wayne Parham on 2002-10-24, 15:28:34 (63.52.151.42)
Hello! 600Hz will be no more than an octave away from at least one crossover point in most speakers. And having a sample of performance at 100Hz is good too; Might have been nice having samples taken .......
290: High Efficiency Speaker Asylum, Re: crossover caps (0.00)
Posted by Wayne Parham on 2002-10-24, 12:48:02 (63.52.151.42)
Hi Michael! Check out the post called " Quantified performance ." There is performance data of various technology parts at the link provided. Take care! Wayne Parham .......
291: High Efficiency Speaker Asylum, Re: Home measurement ambiguity (0.00)
Posted by Wayne Parham on 2002-10-23, 12:52:41 (63.52.128.244)
Hi Tom! Here's a graph that shows correlation with the published response chart: And another sample: And yet another: Here's what the manufacturer published for the part: The charts all tend .......
292: High Efficiency Speaker Asylum, Re: Home measurement ambiguity (0.00)
Posted by Wayne Parham on 2002-10-23, 12:51:58 (63.52.128.244)
Hi Mike! Here's a graph that shows correlation with the published response chart: And another sample: And yet another: Here's what the manufacturer published for the part: The charts all tend .......
293: High Efficiency Speaker Asylum, Re: Home measurement ambiguity (0.00)
Posted by Wayne Parham on 2002-10-23, 01:39:11 (63.52.129.113)
Hi Tom! What have you used to check your setup? Is it where you place your trust? I think you'll agree that it would be best to have measurements that agreed with something else, in order to provide s .......
294: High Efficiency Speaker Asylum, Re: Home measurement ambiguity (0.00)
Posted by Wayne Parham on 2002-10-23, 00:12:38 (63.52.129.113)
Hi Tom! You wrote: >> Sounds like circular reasoning, if you don't measure the drivers >> how do you know you can trust the makers of them? That statement really drives home the point here; It's at th .......
295: High Efficiency Speaker Asylum, Re: ???????????????????????? (0.00)
Posted by Wayne Parham on 2002-10-23, 00:11:19 (63.52.129.113)
Hello John - You wrote: >> Man, it is hard to ignore this... Then don't. Perhaps you've got a better way to check the reliability of budget measuring gear. What do you use to verify your equipment, Jo .......
296: High Efficiency Speaker Asylum, Home measurement ambiguity (0.00)
Posted by Wayne Parham on 2002-10-22, 15:18:19 (63.52.128.233)
Hi guys! I have a suggestion. There is so much ambiguity when doing home measurements, and it is desirable to reduce this ambiguity as much as possible. That's why I prefer to use published specs - Th .......
297: High Efficiency Speaker Asylum, Re: still more Crossover Filters, Frequency and Position (0.00)
Posted by Wayne Parham on 2002-10-13, 14:00:25 (63.52.128.72)
Hi Tom! You wrote: >> While popular audio lore is that 1st order filters are needed for >> time alignment, it is clear that by aligning the filters properly, >> that a wide variety of arrangements are .......
298: High Efficiency Speaker Asylum, Re: still more Crossover Filters, Frequency and Position (0.00)
Posted by Wayne Parham on 2002-10-12, 19:40:15 (63.52.128.101)
Hi Tom! I wrote: Phase is maximum at the asymptote, minimum in the pass band. and you replied: >> Say what??? >> The phase shift is nearly zero well above or well below the >> crossover and has the g .......
299: High Efficiency Speaker Asylum, Re: still more Crossover Filters, Frequency and Position (0.00)
Posted by Wayne Parham on 2002-10-12, 16:41:15 (63.52.128.101)
Hi Tom! You wrote: >> The tone of the paper sounds kind of like it is suppose to be >> an "educational document" rather than just a sales pitch Yes. All of the downloads on the π Speakers website a .......
300: High Efficiency Speaker Asylum, Shunt resistance (0.00)
Posted by Wayne Parham on 2002-10-10, 12:45:53 (63.52.130.235)
Hi Rod! You wrote: >> To be honest, I probably wouldn't even worry about it. At a 600hz >> xover, you're -6db at 300hz. With just your cap, the xover would >> be about 400hz and -6db at 200. Very true .......
301: High Efficiency Speaker Asylum, 2441 crossover answer (0.00)
Posted by Wayne Parham on 2002-10-09, 20:07:56 (63.52.130.220)
Hi Ray! To change a 16 ohm resistive load to a 10.5 ohm load, you'll want to use a 30 ohm resistor across the motor. I also invite you to check out the section about first-order networks in the π .......
302: High Efficiency Speaker Asylum, Crossover Filters, Frequency and Position (0.00)
Posted by Wayne Parham on 2002-10-09, 13:00:54 (63.52.130.220)
Hello world! In response to last week's discussion about crossover filters and diaphragm positions, I have prepared a document that shows response curves of various systems using a variety of differen .......
303: K&K Audio / Lundahl Transformers, Welcome! (0.00)
Posted by Wayne Parham on 2002-10-08, 13:34:59 (165.122.129.81)
Welcome to the site! .......
304: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-07, 17:34:44 (63.52.128.78)
John - I have demonstrated the performance of the crossovers used in my speakers, as well as several other networks including first-order, second-order and hybrids. I stand on the validity of the anal .......
305: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-07, 17:27:39 (63.52.128.78)
John - You wrote: >> I have no doubt that you can show us crossovers that look bad in LSPCAD. I've demonstrated that, yes. It has been a point of mine that it impossible to create a filter that is fre .......
306: High Efficiency Speaker Asylum, Re: Measurement for DIY? or at all? (0.00)
Posted by Wayne Parham on 2002-10-07, 17:01:51 (63.52.128.78)
John - Your attacks are nothing more than that; Same as others that share your views. I stand on the validity of the analysis shown in the π Crossover document and the Speaker Offset document . Wa .......
307: High Efficiency Speaker Asylum, Re: Measurement for DIY? or at all? (0.00)
Posted by Wayne Parham on 2002-10-07, 12:06:36 (63.52.128.78)
Tom - I've plotted graphs of summed response for drivers at different positions using several crossover types, and made them available here. The participation of diaphragm position from -1.25 waveleng .......
308: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-07, 00:36:44 (63.52.128.237)
John - Here's the response of the 2nd/4th order split crossover as you proposed, with the tweeter offset behind the woofer a couple of inches. I think you'll agree that's not a very good response cu .......
309: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-07, 00:34:20 (63.52.128.237)
John - Here's the response of the 2nd/4th order split crossover as you proposed, with the tweeter offset behind the woofer a couple of inches. I think you'll agree that's not a very good response cu .......
310: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-07, 00:30:37 (63.52.128.237)
John - Here's the response of the 2nd/4th order split crossover as you proposed, with the tweeter offset behind the woofer a couple of inches. I think you'll agree that's not a very good response cu .......
311: High Efficiency Speaker Asylum, Re: Measurement for DIY? or at all? (0.00)
Posted by Wayne Parham on 2002-10-05, 01:27:30 (63.52.129.88)
John - You are responsible for your statements, certainly, and I am responsible for mine as well. But I also make the observation that you have a very close relationship with ServoDrive, and that ther .......
312: High Efficiency Speaker Asylum, An independent user-supported organization (0.00)
Posted by Wayne Parham on 2002-10-05, 01:25:33 (63.52.129.88)
John - I'd like to address your frequent innuendoes about qualifications. When ideas are discussed, it doesn't matter if a person is an orangutan, layman, doctorate or machine intelligence, as long as .......
313: High Efficiency Speaker Asylum, Re: Measurement for DIY? or at all? (0.00)
Posted by Wayne Parham on 2002-10-04, 16:45:36 (63.52.128.231)
Hello Tom - About ServoDrive representatives, it was your man who started this riff between us. Mark Seaton attacked my product offering many months ago, and my reactions were slow in coming. So it is .......
314: High Efficiency Speaker Asylum, Re: Possibility of a objective, anechoic measurement... (0.00)
Posted by Wayne Parham on 2002-10-04, 16:16:29 (63.52.128.231)
Mark - You might understand if I am a little bit suspicious about considering a measurement shop that you've picked as "objective." Wayne .......
315: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-04, 16:11:31 (63.52.128.231)
John - The fact that you've chosen this particular offset - truly any offset between 3" and 6" - is manipulative. You have chosen the worst possible configuration for the system, and made the case tha .......
316: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-04, 16:06:56 (63.52.128.231)
John - The fact that you've chosen this particular offset - truly any offset between 3" and 6" - is manipulative. You have chosen the worst possible configuration for the system, and made the case tha .......
317: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-04, 15:45:31 (63.52.128.231)
John - You wrote: >> The problem gets worse the more offset there is. That's completely false. The problem is worse between critical distances. There are also distances - both larger and smaller - whe .......
318: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-04, 12:37:43 (63.52.128.231)
John - Here are examples of both offset directions. There are some π Speaker designs where the tweeter is ahead of the woofer, and others with the woofer ahead of the tweeter. There are several dis .......
319: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-04, 03:46:34 (63.52.129.110)
John - You're still reaching. But I do appreciate the opportunity to demonstrate this matter. You appear to have missed the target, again . Are you fabricating your data? Are you clicking buttons just .......
320: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-04, 00:19:45 (63.52.129.110)
John - Nice try. Page 46 of my Crossover Document shows a crossover circuit having two adjacent second-order networks. It is shown only for demonstration, and the document describes warnings for anyon .......
321: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-03, 23:59:16 (63.52.129.110)
John - Further discussion is pointless, because your assumptions are incorrect. I encourage you to read the π Crossover Document before commenting on its contents. Wayne Parham .......
322: High Efficiency Speaker Asylum, Re: Measurement for DIY? or at all? (0.00)
Posted by Wayne Parham on 2002-10-03, 22:00:08 (63.52.129.42)
Hi Tom! I replied to your post several days ago, sending to the address from an earlier E-Mail I received from you. But perhaps the address has changed, so I'll reply here, in public. I had hoped to r .......
323: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-03, 17:44:57 (63.52.129.42)
John - You couldn't possibly be more wrong. Destructive interference requires that acoustic pressure is out of phase in a particular position or positions. It isn't an effect that is global. Directio .......
324: High Efficiency Speaker Asylum, Re: General speakermodel in Spice? (0.00)
Posted by Wayne Parham on 2002-10-03, 13:39:57 (63.52.129.42)
Hello! You'll find models for specific speakers and for generalized cases in the Spice distribution on the π Speakers website. Take care! Wayne Parham .......
325: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-03, 12:56:58 (63.52.129.42)
John - The directionality of the devices used is such that there is not nearly enough energy to combine having this kind of destructive interference. Further, the crossover slope is steep, so the over .......
326: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-02, 15:52:48 (63.52.129.58)
John - Uppity? The very basis of this thread was your attempt to discredit me. At one point, you held out the false promise of delivering "improved" crossovers. That's deceptive, even fraudulent and p .......
327: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-02, 12:13:27 (63.52.129.58)
John - Your avoidance of the specifics is distressing. Make a suggestion for a passive crossover for a two-way loudspeaker containing an HF compression horn. Choose any two drivers, and tell us how yo .......
328: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-02, 01:28:58 (63.52.129.23)
John - Quit this equivocation. Be specific. Make a suggestion for a passive crossover for a two-way loudspeaker containing an HF compression horn. Choose any two drivers, and tell us how you would imp .......
329: High Efficiency Speaker Asylum, Re: Measurement for DIY? or at all? (0.00)
Posted by Wayne Parham on 2002-10-02, 00:47:02 (63.52.129.23)
John - 1. About non-linear performance, the document clearly shows that the system can be only be reliably used to measure "weakly" non-linear systems, and suggests specific instances that may apply. .......
330: High Efficiency Speaker Asylum, Re: Measurement for DIY? or at all? (0.00)
Posted by Wayne Parham on 2002-10-01, 22:51:01 (63.52.129.23)
John - Two things: 1. The measurement system described is indeed interesting but somewhat sensitive to the presence of non-linearities, which cause anomalous artifacts and skew measurement results. An .......
331: High Efficiency Speaker Asylum, Re: Measurement environment (0.00)
Posted by Wayne Parham on 2002-10-01, 21:13:32 (63.52.128.16)
John - You know, John, if you are an OEM using components from a specific vendor, you might consider asking them for their measurements. Many OEM's describe necessary parameters to their vendor, and h .......
332: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-01, 16:31:29 (63.52.128.16)
John - No, but I designed one for the TAD 1602 and the 4001. I've got 'em for sale if you want them. Now then, quit quizzing me. I've put my crossover document online and I've put my tuning methods on .......
333: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-01, 15:37:29 (63.52.128.16)
John - You know, you've thrown the word "fraud" around quite a bit here. In fact, that was the opening idea of this thread. But where "fraud" is concerned, you suggest familiarity with subjects you kn .......
334: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-10-01, 11:50:28 (63.52.128.16)
John - Your assertions are unfounded, innacurate and untrue. The crossovers are well-formed, and there is no mystery there. Further, to say they don't "sum flat" is a gross dereliction, and you are on .......
335: High Efficiency Speaker Asylum, Re: Measurement environment (0.00)
Posted by Wayne Parham on 2002-10-01, 11:43:39 (63.52.128.16)
Hi John! You're probably right. I just got annoyed at this guy needling me, and I let it show. Wayne .......
336: High Efficiency Speaker Asylum, Re: Measurement environment (0.00)
Posted by Wayne Parham on 2002-10-01, 03:35:42 (63.52.128.94)
John - I don't know if you've measured test equipment lately, but a good scope will cost as much as twenty or thirty high-performance PC's. So it would take a lot of little speaker workshop hackstatio .......
337: High Efficiency Speaker Asylum, Re: Measurement environment (0.00)
Posted by Wayne Parham on 2002-09-30, 15:38:55 (63.52.151.27)
John - You have mischaracterized my paper, by placing your own presumptions upon the issue. Speaker drivers are described with some linear properties and some non-linear properties. Fortunately, for t .......
338: High Efficiency Speaker Asylum, Re: Measurement environment (0.00)
Posted by Wayne Parham on 2002-09-30, 12:58:12 (63.52.151.27)
John - You couldn't possibly be more wrong. The crossover is designed considering driver parameters in this regard, and this process is also described in the π crossover document . Wayne Parham :: .......
339: High Efficiency Speaker Asylum, Re: Measurement environment (0.00)
Posted by Wayne Parham on 2002-09-30, 12:25:50 (63.52.151.27)
John - You are making assertions that aren't shared by all and your insistence that the few parts in a crossover crossover circuit are difficult to understand is not important to me. I invite you to p .......
340: High Efficiency Speaker Asylum, Re: Measurement environment (0.00)
Posted by Wayne Parham on 2002-09-30, 12:05:25 (63.52.151.27)
John - I removed no posts of this sort. But you are right to draw reference to the fact that I've had measuring equipment for several decades. I've been doing this for a long time, probably since befo .......
341: High Efficiency Speaker Asylum, Re: Measurement environment (0.00)
Posted by Wayne Parham on 2002-09-30, 10:39:20 (63.52.151.27)
John - Your memory fails you. I've not discussed the things I own here. Seems a bit stupid, really. What I have discussed, is that I think taking a speaker in the next room to measure it and publishin .......
342: High Efficiency Speaker Asylum, Re: Measurement environment (0.00)
Posted by Wayne Parham on 2002-09-30, 10:27:37 (63.52.151.27)
John - You wrote: >> You're avoiding the question, Wayne. No, you're misrepresenting the facts. You believe that time alignment is an issue, and you suggest issues that are important in this regard. B .......
343: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-09-30, 10:19:44 (63.52.151.27)
John - You wrote: >> Feel free to take the last word, Wayne Thanks, John. I will. >> It is just amazing to me that you would site Floyd Toole as >> supporting your argument. I haven't read the paper, .......
344: High Efficiency Speaker Asylum, Re: Pi speaker design and measurement (0.00)
Posted by Wayne Parham on 2002-09-30, 02:42:52 (63.52.131.50)
John - I think it's best to leave it to the reader to interpret Dr. Toole's words. I'm sure that he wouldn't appreciate the inferrence that you know him so well that you can speak for him. You've impl .......
345: High Efficiency Speaker Asylum, Re: Measurement environment (0.00)
Posted by Wayne Parham on 2002-09-30, 00:13:03 (63.52.131.50)
John - I have thousands of dollars worth of test equipment and an extensive inventory of components. Some of this equipment has been shown in photographs on my forum. I can actually perform tests on l .......
346: High Efficiency Speaker Asylum, Re: Measurement environment (0.00)
Posted by Wayne Parham on 2002-09-30, 00:09:56 (63.52.131.50)
John - I've said before that I use manufacturers data. I've also said before that I consider time alignment issues to be down at the bottom of the list of importance. If that is important to you, fine .......
347: High Efficiency Speaker Asylum, Re: Measurement environment (0.00)
Posted by Wayne Parham on 2002-09-29, 17:21:14 (63.52.130.193)
Hi Tom! Yeah, seems like the first anechoic chamber was made by Bell Labs or someone around WWII. It was pretty small actually, and was probably only good down to a couple hundred Hertz. But I also re .......
348: High Efficiency Speaker Asylum, Re: Measurement environment (0.00)
Posted by Wayne Parham on 2002-09-29, 16:54:41 (63.52.130.193)
John - You wrote: >> There are not many rooms that are anechoic down to 20Hz. It would >> take 4 meters of insulation on each wall and the ceiling and even >> then you wouldn't get complete absorption .......
349: High Efficiency Speaker Asylum, Measurement environment (0.00)
Posted by Wayne Parham on 2002-09-29, 13:16:24 (63.52.130.193)
John - There is no way to decouple the room from the speaker being measured, and this problem grows worse as frequency drops. If the room isn't anachoic and it isn't a large chamber, "measurements" ob .......
350: High Efficiency Speaker Asylum, Congratulations! (0.00)
Posted by Wayne Parham on 2002-09-28, 22:48:50 (63.52.131.85)
That's a beautiful girl! Two beautiful girls!!! .......
351: High Efficiency Speaker Asylum, Re: Cornerhorns! (0.00)
Posted by Wayne Parham on 2002-09-27, 23:16:59 (63.52.129.72)
Hi John! You wrote: >> Enough of this twaddle - feel free to get the last word, as always. Thanks, I will. >> Of course you're right that measurements made indoors in a >> non-nearfield situation will .......
352: High Efficiency Speaker Asylum, Re: Cornerhorns! (0.00)
Posted by Wayne Parham on 2002-09-27, 22:15:42 (63.52.129.72)
Hi Tom! You wrote: >> What are you saying, that John should measure your speaker but >> then that the measurement won't matter anyhow? I wouldn't presume to tell John what he should or shouldn't do. B .......
353: High Efficiency Speaker Asylum, That's pretty Zen (0.00)
Posted by Wayne Parham on 2002-09-27, 21:59:32 (63.52.129.72)
Wow, dude - I get angry too. But really, man, let's just try to put things back to having fun, OK? Don't sweat the small stuff. And everything is "small stuff." I know I saw that in a movie somewhere, .......
354: High Efficiency Speaker Asylum, What is up?!! (0.00)
Posted by Wayne Parham on 2002-09-27, 21:38:48 (63.52.128.99)
Mike - What is up with that? Wayne .......
355: High Efficiency Speaker Asylum, Re: Cornerhorns! (0.00)
Posted by Wayne Parham on 2002-09-27, 17:46:56 (63.52.128.99)
John - You wrote: >> I still think it's funny that you get so worked up over this, >> considering that you know nothing about it. First point - I get worked up about it because of nonsense like that. .......
356: High Efficiency Speaker Asylum, Re: Cornerhorns! (0.00)
Posted by Wayne Parham on 2002-09-27, 15:33:25 (63.52.128.99)
Hi John! You know, my participation in this thread was to point out that the room's corner has the same flare as the Unity. Tom Dawson mentioned that he wanted to build one, and I suggested a method t .......
357: High Efficiency Speaker Asylum, Re: Cornerhorns! (0.00)
Posted by Wayne Parham on 2002-09-27, 11:57:48 (63.52.128.99)
"Night and day" Day: "This type of horn provides 9dB DI gain over freespace." Night: "This type of horn causes two different sets of radiators to be aligned at frequencies represented by several feet .......
358: High Efficiency Speaker Asylum, Re: Cornerhorns! (0.00)
Posted by Wayne Parham on 2002-09-27, 11:39:21 (63.52.128.99)
He heh... :> Particularly the claim that a 4 foot long cycle and a 3/4 inch cycle are aligned, generated by the same "point source" using such an "aperature." It's Magic! .......
359: High Efficiency Speaker Asylum, Re: Cornerhorns! (0.00)
Posted by Wayne Parham on 2002-09-27, 10:10:13 (63.52.128.99)
John - That's true, 100%. Particularly in regards to claims made. "Night and day." Wayne .......
360: High Efficiency Speaker Asylum, Re: Cornerhorns! (0.00)
Posted by Wayne Parham on 2002-09-27, 00:54:12 (63.52.128.216)
Hi John! You wrote: [about the Unity horn] >> The flair rate is slower than the corner of a room in all the implementations I have seen (and built). The most popular implementation of the Unity horn a .......
361: High Efficiency Speaker Asylum, Room boundaries (0.00)
Posted by Wayne Parham on 2002-09-26, 16:08:48 (63.52.128.206)
Hi Tom! You wrote: >> However, for a really accurate system, putting SWs which are >> capable of group delays in the low millisecond range anywhere in >> their usable passbands in room corners would b .......
362: High Efficiency Speaker Asylum, Cornerhorns! (0.00)
Posted by Wayne Parham on 2002-09-26, 15:59:01 (63.52.128.206)
Hi Tom! You wrote: >> How about a Unity type horn with a TAD 4001 crossed over to 2 or 4 >> 12" or 15" woofers built into the sides of the flare good down to >> 40-50 hz sitting on a 34" tall closed s .......
363: High Efficiency Speaker Asylum, Most other basshorn builders too (0.00)
Posted by Wayne Parham on 2002-09-25, 21:23:30 (63.52.128.174)
Hi Tom! You wrote: >> Tom Nousaine thinks you stack your SW's in a corner & you're done. If you think about it, so did Klipsch. If a guy has a basshorn cabinet that isn't in the corner, then the mouth .......
364: High Efficiency Speaker Asylum, Re: Discussions about loudspeaker "speed" (0.00)
Posted by Wayne Parham on 2002-09-24, 22:38:17 (63.52.128.197)
Hi John! You wrote: >> I suppose it could also be pointed out here, since we started >> talking about distortion, that using a woofer that has cone break >> up will also introduce distortion if the wo .......
365: High Efficiency Speaker Asylum, Discussions about loudspeaker "speed" (0.00)
Posted by Wayne Parham on 2002-09-24, 17:15:55 (63.52.130.241)
Hi guys! John wrote: >> I don't agree with his statement (or maybe implication) that the >> quality of a woofer is unimportant, though. Bass distortion will >> definitely have an effect on what you he .......
366: High Efficiency Speaker Asylum, Re: Electrolytic caps biased with batteries (0.00)
Posted by Wayne Parham on 2002-09-21, 21:22:35 (63.52.150.34)
Hello again Freddy! You wrote: >> that sounds like madness to use batteries Yes, it does. But the scope doesn't lie, and it isn't ambiguous because the testing conditions are simple and well defined. .......
367: High Efficiency Speaker Asylum, Electrolytic caps biased with batteries (0.00)
Posted by Wayne Parham on 2002-09-21, 13:38:30 (63.52.150.34)
Hi Fred! Did you know that some high-end JBL loudspeaker systems have batteries in their crossovers to bias the capacitors? Steve Bench has taken his scope, signal generator and amp and demonstrated w .......
368: High Efficiency Speaker Asylum, Quantified performance (0.00)
Posted by Wayne Parham on 2002-09-21, 01:17:49 (63.52.150.163)
Hi George! Here's a great little web page that Steve Bench has put together that quantifies the performance of various capacitor technologies . I think you'll find it interesting. Take care! Wayne Par .......
369: High Efficiency Speaker Asylum, Beat Frequencies (0.00)
Posted by Wayne Parham on 2002-09-15, 15:46:01 (63.52.128.190)
Hello Dave! You wrote: >> i have been told if you mix a 40K and a 41K signal >> even though both are well beyond the range of >> hearing for us bipeds, you can still hear an >> audible 1K artifact. Th .......
370: High Efficiency Speaker Asylum, Quarter space +6dB (0.00)
Posted by Wayne Parham on 2002-09-15, 15:38:55 (63.52.128.190)
Hello! You might want to peruse Augspurger's " JBL Professional Sound System Design Manual ." Your topic is discussed specifically in Chapter 3, Page 1. Take care! Wayne Parham π Speakers ::: TOP .......
371: High Efficiency Speaker Asylum, Piezoelectric tweeters (0.00)
Posted by Wayne Parham on 2002-09-11, 16:35:12 (63.52.128.171)
Hi Jeff! You wrote: >> Are the tweeters and woofers both wired directly off the connectors? Yes. >> I know very, very little about electronics, but without a >> crossover how is the tweeter protected .......
372: High Efficiency Speaker Asylum, The phase plug is inside the compression driver (0.00)
Posted by Wayne Parham on 2002-09-08, 18:25:34 (63.52.128.171)
Hi guys! The phase plug is between the diaphragm and the horn. It acts to make the throat area smaller, and to provide "compression ratio." But it's main purpose is to reduce path length differences a .......
373: High Efficiency Speaker Asylum, Re: horn subs specs (0.00)
Posted by Wayne Parham on 2002-09-05, 11:21:30 (63.52.128.149)
Hi Michael! The gray line is right on the money for the π horn. The blue line looks like it is for a comparibly large exponential or hyperbolic horn, yes? Wayne .......
374: High Efficiency Speaker Asylum, Re: horn subs specs (0.00)
Posted by Wayne Parham on 2002-09-05, 11:11:49 (63.52.128.149)
Hi Mark! Yes - I would expect the models to be accurate. I'm not sure about the measurements, but they did tend to be close to what the math said they should be. But no matter, the modeled response wa .......
375: High Efficiency Speaker Asylum, Re: horn subs specs (0.00)
Posted by Wayne Parham on 2002-09-04, 22:54:26 (63.52.151.94)
Hi guys! Tom wrote: >> For what its worth, the curve that Wayne has posted is of the >> first prototype of the LAB horn In all fairness, the chart I posted was from the forum on the LAB web site. This .......
376: High Efficiency Speaker Asylum, Re: horn subs specs (0.00)
Posted by Wayne Parham on 2002-09-04, 22:35:31 (63.52.151.94)
Hi guys! When looking at John's response charts, note that the gradient is 3dB between marks. Note also that, in the case of the conical (corner) horn, the horn formed by the corner's expansion from .......
377: High Efficiency Speaker Asylum, Re: horn subs specs (0.00)
Posted by Wayne Parham on 2002-09-04, 22:16:08 (63.52.151.94)
Hi John! You wrote: >> Ahh, okay. Now I see where you're coming from (I think). If you >> build a little stubby horn (which as you say, isn't really a bass >> horn - it's just a fancy sealed box, or v .......
378: High Efficiency Speaker Asylum, Re: horn subs specs (0.00)
Posted by Wayne Parham on 2002-09-04, 16:22:43 (63.52.151.94)
Hi John! My main point in this thread was to mention that the room's corner is the most important part of a corner horn. Since that's what an 1/8th space horn really is, and since it's the way to make .......
379: High Efficiency Speaker Asylum, Da, Vi znali! (0.00)
Posted by Wayne Parham on 2002-09-04, 15:36:21 (63.52.129.62)
Your Russian is very good! The same refernce is made to "cats" as would be in English, and the same double meaning can be taken. Vsevo Horoshevo! Poka, Wayne .......
380: High Efficiency Speaker Asylum, Re: horn subs specs (0.00)
Posted by Wayne Parham on 2002-09-04, 11:38:06 (63.52.129.62)
Hello again John! I wrote: there's no such thing as a bass horn "sub" in anything less than 1/8th space. to which you replied: >> Sure there is. Build a horn that has a mouth extending from floor >> .......
381: High Efficiency Speaker Asylum, Re: horn subs specs (0.00)
Posted by Wayne Parham on 2002-09-03, 20:45:19 (63.52.151.48)
Hello again John! You wrote: >> So, why do you think a horn's shape matters in, for example, half >> space but not in 1/8 space? Because from my way of thinking, there's no such thing as a bass horn " .......
382: High Efficiency Speaker Asylum, Nyet. Ti kiska maliska. (0.00)
Posted by Wayne Parham on 2002-09-03, 19:51:02 (63.52.151.48)
.......
383: High Efficiency Speaker Asylum, Re: horn subs specs (0.00)
Posted by Wayne Parham on 2002-09-03, 19:48:10 (63.52.151.48)
Hi John! Mouth size needs to be substantial on a horn used below 40Hz, even if used in a constrained space. When we discuss horns used for bass - even midbass but certainly for use as "subs" - I think .......
384: High Efficiency Speaker Asylum, Re: cabinet thickness (0.00)
Posted by Wayne Parham on 2002-08-27, 03:29:02 (63.52.128.111)
Hello! You wrote: >> It seems there are two worlds in speaker building: low efficiency >> boxes using vifa, scan-speak, seas ... drivers, and built often >> from 2" thickness material for ~ 1 cu ft bo .......
385: High Efficiency Speaker Asylum, Joints, what joints? Talk about that tung oil!!! (0.00)
Posted by Wayne Parham on 2002-08-27, 00:45:21 (63.52.129.54)
Hi Bill! You are the man, Mr. E!!! Love your informative and entertaining posts. The craftsmanship detail is discussed much less often here, but it's actually probably the most important thing to disc .......
386: High Efficiency Speaker Asylum, Model the system (0.00)
Posted by Wayne Parham on 2002-08-25, 00:06:19 (63.52.129.83)
Hello! You wrote: >> Sound of 1" threaded driver on flange converter into 2' throat? >> Is this good, bad , or? It depends on the flare of the adapter, the flare of the horn and on the compression dri .......
387: High Efficiency Speaker Asylum, Re: The Edgar Horn (0.00)
Posted by Wayne Parham on 2002-08-23, 00:24:56 (63.52.131.62)
Hi Bruce! You wrote: >> I have found that the L70 has a bad resonance of the back panel. >> It can be tuned out with several tension braces between the back >> panel just above the mouth and the slant .......
388: High Efficiency Speaker Asylum, More Unity stuff (0.00)
Posted by Wayne Parham on 2002-08-20, 12:44:58 (63.52.131.95)
Hi Tom! In another post , I wrote: "You knew that Tom. You're participation here, to champion your Unity horn, does not really bother me too much. But your demeaning attitude when faced with statement .......
389: High Efficiency Speaker Asylum, Re: Conical horns, revisited (0.00)
Posted by Wayne Parham on 2002-08-18, 17:47:43 (63.52.128.236)
Hi Tom! This thread was really intended to be a discussion about radial horns. I've been working with a craftsman who machines throats from billet aluminum and flares from wood. The flare is purely ex .......
390: High Efficiency Speaker Asylum, Re: Conical horns, revisited (0.00)
Posted by Wayne Parham on 2002-08-17, 16:07:20 (63.52.127.200)
Hello again Tom! You wrote: [about split dispersion horns] >> The exact coverage angle is not the problem, it is making the >> H very different from the V that causes the problem. When you array squar .......
391: High Efficiency Speaker Asylum, "As the stomach turns" (0.00)
Posted by Wayne Parham on 2002-08-16, 15:11:14 (63.52.150.106)
Hello! You're right, it is sort of a "soap opera." But just for the archives, I'd like to set the record straight. It is embarrassing to me when threads that I participate on become "flame-fests." I'm .......
392: High Efficiency Speaker Asylum, Conical horns, revisited (0.00)
Posted by Wayne Parham on 2002-08-15, 17:25:21 (63.52.129.66)
Hi Tom! Thanks for your continued participation in our discussion on this subject. But I must ask you this: What exactly do you suggest for a solution where coverage requires greater than 60 degree d .......
393: High Efficiency Speaker Asylum, Re: Radial horns, revisited (0.00)
Posted by Wayne Parham on 2002-08-14, 16:38:54 (63.52.151.43)
Hi Steve! Wow! Thanks for posting that. Very interesting excerpt about Stephens. I'm impressed! Both with the concept and with your catching it and posting it here. As for the large radials, I'm with .......
394: High Efficiency Speaker Asylum, Re: Radial horns, revisited (0.00)
Posted by Wayne Parham on 2002-08-14, 12:18:55 (63.52.128.161)
Hello John - You wrote: >> Going multicellular doesn't do much for control at the low end. >> For example, two 30x30 horns with 1'x1' mouth placed side by side >> radially are going to have about the .......
395: High Efficiency Speaker Asylum, Re: Build Details (0.00)
Posted by Wayne Parham on 2002-08-14, 00:00:07 (63.52.128.148)
Hi Bill! Thanks for your E-Mail. I noticed that the impedance graphs show much higher peaks on the tractrix at cutoff, both in the real and imaginary load. It is really odd how much the bell of the fl .......
396: High Efficiency Speaker Asylum, Re: Radial horns, revisited (0.00)
Posted by Wayne Parham on 2002-08-13, 23:36:47 (63.52.128.148)
Hi Freddy! You wrote: >> FWIW think a tractrix approach is good - am not sure how an >> engineer would handle the initial throat section from 1" driver One could be machined from billet aluminum, and .......
397: High Efficiency Speaker Asylum, Radial horns, revisited (0.00)
Posted by Wayne Parham on 2002-08-13, 17:00:38 (63.52.128.148)
Hello World! This is a continuation of the thread below called " Radial tractrix horns ". Basically, the reason I've wanted to bring this discussion here is that I have a friend who asked my advice fo .......
398: High Efficiency Speaker Asylum, Put two of 'em side by side and you have a sectional horn... (0.00)
Posted by Wayne Parham on 2002-08-13, 00:55:55 (63.52.129.73)
Hi Tom! Thanks for your input. I know you like conical horns, and so do I. And I know you like axisymmetric horns, there again, I do too. But for use individually or with only limited numbers, the pro .......
399: High Efficiency Speaker Asylum, Radial instead of sectional (0.00)
Posted by Wayne Parham on 2002-08-11, 20:39:13 (63.52.128.88)
Hi Bill! You wrote: >> When the horn is not of round section, then when you say tractrix >> do you mean? >> a) to maintain an area expansion over some surface? >> or >> b) to maintain a flair profile .......
400: High Efficiency Speaker Asylum, International money transfers and shipping (0.00)
Posted by Wayne Parham on 2002-08-11, 20:00:28 (63.52.128.88)
Hi Sam! You wrote: >> I'm still waiting your confirmations. Why not responds recently? I sent you a price and method of payment I would accept. So if you make this payment, I'd be glad to send the TAD .......
401: High Efficiency Speaker Asylum, Behave yourself or you will be silenced (0.00)
Posted by Wayne Parham on 2002-08-11, 04:00:35 (63.52.128.75)
Roman - You will not act this way here on this forum again. The remarks you've made on this forum and others are consistently rude. For people to react to you negatively is predictable. As for me, it' .......
402: High Efficiency Speaker Asylum, Radial tractrix horns (0.00)
Posted by Wayne Parham on 2002-08-10, 16:48:12 (63.52.128.134)
Hello world! I'm "thinking outloud" here. I've used both radial horns and round horns for a long time. Honestly, I prefer the radial horns because they direct more energy side-to-side than they do at .......
403: High Efficiency Speaker Asylum, Re: starting on pseudo vots (or pseudo 4 pi's?) (0.00)
Posted by Wayne Parham on 2002-08-10, 13:06:31 (63.52.129.69)
Hi Don! You wrote: >> What do you recommend for damping? Will fiberglass on the top and >> bottom be adequate, or does it need more? I recommend installing a layer layer of R13 insulation on the insid .......
404: High Efficiency Speaker Asylum, Re: starting on pseudo vots (or pseudo 4 pi's?) (0.00)
Posted by Wayne Parham on 2002-08-10, 02:15:36 (63.52.151.81)
Hi Don! You wrote: >> Besides the 8.5 cu ft, you also need to add the volume displaced by >> the port, the driver and any bracing, which is definitly needed. >> I made mine 24 in wide, 36 in high, and .......
405: High Efficiency Speaker Asylum, Two-way speakers (0.00)
Posted by Wayne Parham on 2002-08-10, 02:09:22 (63.52.151.81)
Hello again Dan! You wrote: >> As far as our designs being more alike than different, I'd take >> issue with that as well (I think they are extremely different, >> both in concept, goal, and implement .......
406: High Efficiency Speaker Asylum, Re: WM60 Calibration file (0.00)
Posted by Wayne Parham on 2002-08-10, 01:38:05 (63.52.151.81)
Hi Dan! You wrote: [about the "WM60" microphone] >> This is a raw capsule available from Digikey. Add another $15 in >> parts for a preamp, and you're done. >> >> In terms of frequency response, and u .......
407: High Efficiency Speaker Asylum, Altec 416 π's! (0.00)
Posted by Wayne Parham on 2002-08-09, 23:56:33 (63.52.151.81)
Hi Kevin! You wrote: >> So i am thinking of the cabs being 18" wide x 18" deep by 45.5" >> tall. that makes 8.5 CF right :^). I like the look of the horn >> being wider than the cab, like those "210 s .......
408: High Efficiency Speaker Asylum, Re: WM60 Calibration file (0.00)
Posted by Wayne Parham on 2002-08-07, 17:36:59 (63.52.131.28)
Hello Dan! You wrote: >> The image above is the current calibration file for one of our >> WM60 capsule-based test mics (number C70535). Note the scale: >> it is 1 dB per increment vertically. The mic .......
409: High Efficiency Speaker Asylum, Our bookshelf speakers (0.00)
Posted by Wayne Parham on 2002-08-07, 17:17:00 (63.52.131.28)
Hello again Dan! You wrote: >> If someone else wants to start it, and wants some input, that's >> fine. My understanding of the TOS with AA is that manufacturers >> are to keep a low profile, and real .......
410: High Efficiency Speaker Asylum, Re: Zmax (0.00)
Posted by Wayne Parham on 2002-08-06, 20:23:16 (63.52.150.54)
Hello! It wouldn't be bad, but I generally recommend keeping this value a little lower when using SET amps. Wayne .......
411: High Efficiency Speaker Asylum, Re: Stop it! (0.00)
Posted by Wayne Parham on 2002-08-06, 20:19:03 (63.52.150.54)
Hi Rod! If there aren't any "sockpuppets" on this thread, then I do apologize. But I cannot help but wonder how much certainty there is in such a conclusion, since it is relatively easy for a guy to r .......
412: High Efficiency Speaker Asylum, Re: the test... (0.00)
Posted by Wayne Parham on 2002-08-06, 18:04:04 (63.52.150.54)
Of course I'll go back through all this with you. I'll probably just copy and paste old responses, those including response and phase charts to make my case. Start a new dialog and I'll join you there .......
413: High Efficiency Speaker Asylum, Re: response chart (0.00)
Posted by Wayne Parham on 2002-08-06, 16:40:36 (63.52.150.54)
John - You wrote: >> Why don't you just let dead dogs lie. If you think that's a good idea, then perhaps you might consider taking your own advice. Since this is a place of business for me, I'm not su .......
414: High Efficiency Speaker Asylum, Re: response chart (0.00)
Posted by Wayne Parham on 2002-08-06, 13:11:27 (63.52.130.217)
John - The results generated by PiAlign speak for themselves. And the Spice analysis in my crossover document does too. Your comments are libelous amd insulting. If you have a specific debate you'd li .......
415: High Efficiency Speaker Asylum, Master Baiter (0.00)
Posted by Wayne Parham on 2002-08-06, 13:02:02 (63.52.130.217)
Mike, You are the problem here. Leave it alone, and quit posting under different names. I've had problems with you, Bruce Edgar has had problems with you, and countless others that I just don't recall .......
416: High Efficiency Speaker Asylum, Zmax (0.00)
Posted by Wayne Parham on 2002-08-06, 12:57:46 (63.52.130.217)
Hi Martin! Setting aside the personalities, let me tell you my observations. I have some designs that use the Beta series parts, and I like them a alot. But I "skip" a few of Eminence series simply be .......
417: High Efficiency Speaker Asylum, Re: Master Baiter (0.00)
Posted by Wayne Parham on 2002-08-06, 12:44:19 (63.52.130.217)
Hello Dan! Sounds great; It would be better to compare the two speakers on a different thread, with a different tone. You start it and I'll join you there. How 'bout that? Wayne .......
418: High Efficiency Speaker Asylum, Re: response chart (0.00)
Posted by Wayne Parham on 2002-08-06, 12:41:29 (63.52.130.217)
John - Now that's just not cool. First off, where do you get off making a comment like that? My work is published online, and it is pretty solid stuff. Pretty basic too, really - Nothing but very simp .......
419: High Efficiency Speaker Asylum, Re: About this forum and AA in general, and other stuff (0.00)
Posted by Wayne Parham on 2002-08-06, 12:33:35 (63.52.130.217)
Hello Dan! Martin wrote me this morning. We've had trouble here with postings by imposters, and it even occured on this thread. So it was not a huge reach to think that maybe this had happened again u .......
420: High Efficiency Speaker Asylum, Re: final response... (0.00)
Posted by Wayne Parham on 2002-08-05, 23:58:42 (63.52.135.201)
Well, man, maybe. You say you were trying to bring civility. Maybe so. But when a person suggests "getting help" or whatever, it's usually meant as an insult. Here's your post . .......
421: High Efficiency Speaker Asylum, Re: Master Baiter (0.00)
Posted by Wayne Parham on 2002-08-05, 21:09:02 (63.52.135.201)
Hi Dan! I purposely did not enter into a discussion about the strengths and weaknesses of the two products, because I don't really think that's what this is about. This is a baited thread by a "troll, .......
422: High Efficiency Speaker Asylum, Re: About this forum and AA in general, and other stuff (0.00)
Posted by Wayne Parham on 2002-08-05, 20:59:58 (63.52.135.201)
Hello again! To each their own. But I wonder, what made you feel driven to post this here? I mean, you put a lot of energy and effort into this posting, more than I would expect from a "lurker." So wh .......
423: High Efficiency Speaker Asylum, About this forum and AA in general, and other stuff (0.00)
Posted by Wayne Parham on 2002-08-05, 17:56:18 (63.52.135.201)
Please see the post called " About this forum and AA in general, and other stuff ". .......
424: High Efficiency Speaker Asylum, Re: About this forum and AA in general, and other stuff (0.00)
Posted by Wayne Parham on 2002-08-05, 17:47:07 (63.52.135.201)
Hi guys! One thing I really like about Mike Baker, is that he always seems to spread good cheer. Same with Bill Epstein, and I really appreciate people like them; They always seem to be keeping us smi .......
425: High Efficiency Speaker Asylum, Re: response chart (0.00)
Posted by Wayne Parham on 2002-08-05, 17:03:31 (63.52.135.201)
Hi John! The "over the top" comment was actually directed towards John's tendency to criticize my abilities. I think he and I have started to "mend fences" because the deal is really just a collision .......
426: High Efficiency Speaker Asylum, Re: response chart (0.00)
Posted by Wayne Parham on 2002-08-05, 11:55:15 (63.52.150.124)
You're over the top. My work is published and available publically. You were going to do something like that. Weren't you? .......
427: High Efficiency Speaker Asylum, Master Baiter (0.00)
Posted by Wayne Parham on 2002-08-05, 11:35:39 (63.52.150.124)
Man, Mike, you really take the cake. Your attempts at discrediting me are so extreme, so excessive, that you should quit your job and do it full time. Get a life. Wayne .......
428: High Efficiency Speaker Asylum, OK. I'm happy to oblige. (0.00)
Posted by Wayne Parham on 2002-08-05, 01:54:12 (63.52.128.101)
Mark - OK. I'll say it here then, and now. There are some in the Chicago bunch that are jerks - And they've railroaded this thread into the ground. Not everyone in the windy-city club is jaded, but th .......
429: High Efficiency Speaker Asylum, Re: Right Tom - John and Mike aren't biased... (0.00)
Posted by Wayne Parham on 2002-08-04, 17:54:43 (63.52.128.242)
As I said, this appears to me to be an issue of trolls and baiters. But let's show the others how this progressed on the π Speakers forum , shall we? .......
430: High Efficiency Speaker Asylum, Baiters and Trollers (0.00)
Posted by Wayne Parham on 2002-08-04, 15:24:32 (63.52.128.242)
This whole thread appears to be nothing but baiters and trollers. I understand how if you're going to be around someone or a small group, then it's uncomfortable to dissent. But that doesn't make the .......
431: High Efficiency Speaker Asylum, Re: Right Tom - John and Mike aren't biased... (0.00)
Posted by Wayne Parham on 2002-08-04, 14:36:53 (63.52.128.242)
Tom - You know that Mike and John are biased, and that their comments are simply reflections of that. You know that. "Romy the Cat" is jaded too, but then again, he's crazy so who cares. None of the .......
432: High Efficiency Speaker Asylum, Master Baiter (0.00)
Posted by Wayne Parham on 2002-08-04, 13:56:18 (63.52.128.242)
Alright Mike, I'll play with you, 'cause it's soooo fun. In many ways, you're just like Bessnov, or "Romy the Cat." First of all, the Studio Series two π Speaker is an inexpensive bookshelf speaker .......
433: High Efficiency Speaker Asylum, Re: What a ................. (0.00)
Posted by Wayne Parham on 2002-08-04, 12:32:09 (63.52.128.242)
No Mike - I've noticed the same handful of people on this thread - Namely those that have taken disagreement with me in the past. That's all this is about. There is no "unanimous opinion" here, and fo .......
434: High Efficiency Speaker Asylum, Like you really wanted to ask an opinion... (0.00)
Posted by Wayne Parham on 2002-08-04, 03:52:02 (63.52.130.199)
Mike Bates - You certainly do. That was about as transparent a dialog as can possibly happen. You ask a question - More like "setting bait" by asking someone with a known preference for axisymetric tr .......
435: High Efficiency Speaker Asylum, Right Tom - John and Mike aren't biased... (0.00)
Posted by Wayne Parham on 2002-08-04, 03:09:43 (63.52.130.199)
Give me a break! Tom, you know better than that. If you claim otherwise, then you have taken sides, plain and simple. When you say "the bunch of us," might I interpret this to mean the Chicago bunch? .......
436: High Efficiency Speaker Asylum, Where's the beef? (0.00)
Posted by Wayne Parham on 2002-08-03, 13:49:36 (63.52.150.52)
Hey John, Mike and Tim - Have any of you ever heard a two π ? For that matter have you ever ever seen one? How 'bout just "run the numbers" so you might judge how each system might act? You know, t .......
437: High Efficiency Speaker Asylum, Re: Phase, delays and offset baffle spacing (0.00)
Posted by Wayne Parham on 2002-08-01, 15:15:15 (165.122.129.81)
Hi Tom! You wrote: >> Btw, I'm seriously considering doing a Unity type speaker with >> 4 15" woofers, and a TAD4001, taking into account the quarter >> wave cavity resonance due to the depth of that .......
438: High Efficiency Speaker Asylum, Re: Phase, delays and offset baffle spacing (0.00)
Posted by Wayne Parham on 2002-08-01, 12:50:54 (63.52.197.90)
All very true, Tom. But it doesn't help the poor guy trying to offset his tweeter for "time alignment" with his woofer. Wayne .......
439: High Efficiency Speaker Asylum, Phase, delays and offset baffle spacing (0.00)
Posted by Wayne Parham on 2002-07-31, 21:54:14 (63.52.136.31)
Hi Freddy! Check out the π crossover document for a complete description of various two-way networks and filter techniques. I'm sure there are other good ones out there too, but I wrote this one s .......
440: High Efficiency Speaker Asylum, Re: Cornerhorns (0.00)
Posted by Wayne Parham on 2002-07-30, 00:32:11 (63.52.141.174)
Hi Steve! You wrote: >> When I was planning my current bass corner horns (J style, 35 Hz. >> cutoff, exhaust into floor and side walls), I calculated the plane >> wave expansion out of a trihedral cor .......
441: High Efficiency Speaker Asylum, Cornerhorns (0.00)
Posted by Wayne Parham on 2002-07-28, 15:49:07 (63.52.150.82)
Hi Tom! Sorry to jump in on your thread, but I couldn't resist. You wrote: >> I never thought of that 606 cabinet as an attempt at some horn-loading, >> I figured that back in mono days they figured t .......
442: High Efficiency Speaker Asylum, Re: compression drivers (0.00)
Posted by Wayne Parham on 2002-07-28, 01:31:12 (63.52.128.172)
Hello again John! For what it's worth, I think the comparison of the TAD 4001 and the JBL 2446 is a lot like that between the JBL 2426 and the Eminence PSD2002. I find the differences to be slight, an .......
443: High Efficiency Speaker Asylum, Re: compression drivers (0.00)
Posted by Wayne Parham on 2002-07-27, 23:12:00 (63.52.128.172)
Hi John! I agree with you that the JBL 2446 sounds better than the Eminence PSD3003. The diaphragm of a 2446 is titanium but it's phenolic on the PSD3003. But it's a different story on the 1" exit dev .......
444: High Efficiency Speaker Asylum, "The most powerful subwoofer in the world" (0.00)
Posted by Wayne Parham on 2002-07-26, 15:22:44 (63.52.128.83)
Hi Fresno! You asked: >> Where did John's note go? I suspect the moderator of this forum deteted it. Perhaps there were complaints about it being an advertisement. But on the subject of "the most powe .......
445: High Efficiency Speaker Asylum, Re: Define High Efficiency (0.00)
Posted by Wayne Parham on 2002-07-25, 23:03:54 (63.52.127.182)
Hello John! You wrote: >> Sound Pressure Level = 114dB at 16Hz at 200 Watts at 1 meter That's 90dB@1W/1M and we define that as low efficiency here. You'll probably want to suggest this on the " LAB fo .......
446: High Efficiency Speaker Asylum, I've "parted out" some speakers with almost-new 1602's (0.00)
Posted by Wayne Parham on 2002-07-24, 20:35:59 (63.52.135.240)
Hello Zhang! I've got two, both like-new and with factory carton and documentation. I'm asking $250.00 each plus shipping, so that's a sweet deal. Write to me at the return address above if you're int .......
447: High Efficiency Speaker Asylum, Already tuned below 40Hz (0.00)
Posted by Wayne Parham on 2002-07-24, 15:51:05 (63.52.135.240)
Hi guys! Sorry to "barge in" on your thread, but I wanted to interject the point that a "PiAlign'ed" JBL 2226 is tuned for 38Hz. So Professional Series four π Speakers are already tuned under 40Hz .......
448: High Efficiency Speaker Asylum, Corner placement (0.00)
Posted by Wayne Parham on 2002-07-22, 03:47:17 (63.52.128.137)
Hello! I really like corner placement for two reasons. In addition to "room modes," the expansion of the corner forms a conical horn. And while there are some that prefer reduced reflections, I like t .......
449: High Efficiency Speaker Asylum, Too much is not enough! (0.00)
Posted by Wayne Parham on 2002-07-16, 23:33:37 (63.52.136.65)
It looks very similar to your gear, Mike! Good stuff!!! .......
450: High Efficiency Speaker Asylum, Re: horn stuff and final conclusions (0.00)
Posted by Wayne Parham on 2002-07-16, 17:28:52 (63.52.136.65)
Hi Mark! You wrote: >> I still feel like there is a huge language barrier which is >> filtering much useful discussion. We have a few instances here >> of your own presumption of what we have claimed .......
451: High Efficiency Speaker Asylum, Re: horn stuff and final conclusions (0.00)
Posted by Wayne Parham on 2002-07-16, 15:31:16 (63.52.150.59)
Hi Tom! You wrote: [ about the tiny throat orifices required of ultrasound horns ] >> Actually it had "many" throats, all "small enough" for the frequency ranges they were used at. Well, there you go. .......
452: High Efficiency Speaker Asylum, Did you watch? (0.00)
Posted by Wayne Parham on 2002-07-16, 03:22:30 (63.52.128.224)
Hi Bruce! Did you watch the race? Did you enjoy it? Inquiring minds want to know. [grin] Wayne .......
453: High Efficiency Speaker Asylum, Re: horn stuff and final conclusions (0.00)
Posted by Wayne Parham on 2002-07-15, 16:33:51 (63.52.129.95)
Hello Tom! You wrote: >> Again, your assertion that the horn has something to do with hf >> limitations is getting old. I am grateful the air molecules know >> nothing about what you speak of. If they .......
454: High Efficiency Speaker Asylum, Change your mind again? (0.00)
Posted by Wayne Parham on 2002-07-14, 23:10:09 (63.52.128.110)
Hey Mike - Did you continue to follow this thread? I was wondering why you didn't interject your technical comments, questions - Anything except your few isolated insults? Maybe you hoped no one else .......
455: High Efficiency Speaker Asylum, Re: horn stuff and final conclusions (0.00)
Posted by Wayne Parham on 2002-07-14, 22:24:55 (63.52.128.110)
Hi Tom! You wrote: >> Being on Art Bell's radio show was weird, and I was really sleepy >> by the end. I love that show, and I listen to it often. And it's an excellent place to promote your product. .......
456: High Efficiency Speaker Asylum, Re: Unity Patent (0.00)
Posted by Wayne Parham on 2002-07-14, 19:47:15 (63.52.128.110)
Hi John! I hope you understood that, during this dialog, I was addressing the claims of wideband loading and time alignment from the Unity design. I was not "bashing" the design's performance or your .......
457: High Efficiency Speaker Asylum, Re: Horn simulation answer (0.00)
Posted by Wayne Parham on 2002-07-14, 14:38:24 (63.52.129.100)
Hello again! You wrote: >> I understand that at somepoint all I have is the output from the >> driver, but what I'm seeing in HornResp is output 30+dB's down at 4K. At frequencies above and below the .......
458: High Efficiency Speaker Asylum, Horn simulation answer (0.00)
Posted by Wayne Parham on 2002-07-14, 13:01:30 (63.52.129.100)
You wrote: >> I'm trying to model a "mid/high" front horn (cut off at 200 Hz, no >> compression chamber) with Horn resp, and I just don't seem to get >> reasonable results. No matter what I try I get .......
459: High Efficiency Speaker Asylum, UHF (0.00)
Posted by Wayne Parham on 2002-07-13, 23:24:57 (63.52.150.71)
Hi Tom! I had overlooked a couple of your statements earlier, because it seemed that other points were more relevant. The discussion of radio waves and UHF was not really the focus of our discussion, .......
460: High Efficiency Speaker Asylum, Re: horn stuff and final conclusions (0.00)
Posted by Wayne Parham on 2002-07-13, 23:23:04 (63.52.150.71)
Hi John! You wrote: >> It's not the distance between diaphragms you need to worry about. >> It's the total acoustic delay of each driver--geometric, >> electrical, mechanical, and acoustical factors a .......
461: High Efficiency Speaker Asylum, Re: horn stuff and final conclusions (0.00)
Posted by Wayne Parham on 2002-07-13, 05:59:21 (63.52.128.237)
Hi Tom! I took a moment to look at your polar response graphs. The plots were good, for the frequencies and angles chosen. I also pulled the charts from some more "traditional" loudspeakers from vario .......
462: High Efficiency Speaker Asylum, Re: Horn stuff and a post back for Tom (0.00)
Posted by Wayne Parham on 2002-07-11, 23:31:48 (63.52.150.105)
Hello again Tom! You wrote: [about the phase change of a driver or system at resonance] >> non linear normally means a departure from linear operation and is >> evidenced by generation of harmonics or .......
463: High Efficiency Speaker Asylum, Re: Horn stuff and a post back for Tom (0.00)
Posted by Wayne Parham on 2002-07-10, 15:13:49 (63.52.150.69)
Hi Tom! You wrote: >> What your saying is correct then that the speaker, especially a >> point source direct radiator "moves around in time", it in effect >> moves front to back depending on frequency .......
464: High Efficiency Speaker Asylum, Re: Horn stuff and a post back for Tom (0.00)
Posted by Wayne Parham on 2002-07-10, 01:30:58 (63.52.150.43)
Hi Tom! You wrote: >> What your saying is correct then that the speaker, especially a >> point source direct radiator "moves around in time", it in effect >> moves front to back depending on frequency .......
465: High Efficiency Speaker Asylum, Re: SPL/ServoDrive at Chicagoland Summer Horn Bash (0.00)
Posted by Wayne Parham on 2002-07-09, 23:09:56 (63.52.150.43)
Hi Kevin! Let me know if you need anything from me. I've got crossovers, drivers, everything. I expect you've got all the things you'll need, but if not, let me know. Take care! Wayne .......
466: High Efficiency Speaker Asylum, Re: SPL/ServoDrive at Chicagoland Summer Horn Bash (0.00)
Posted by Wayne Parham on 2002-07-09, 17:37:50 (63.52.150.43)
Hi Mark! I think Kevin will have a pair of Stage Series four π 's at the event. If he is willing, I know I'd be happy if you compared them with the Unity's. Better yet would be the Professional Ser .......
467: High Efficiency Speaker Asylum, Re: LAB Bass Horn project (0.00)
Posted by Wayne Parham on 2002-07-09, 17:28:10 (63.52.150.43)
Hi Mark! Your use of a "sea-shell" is similar to mine - My basshorns are all equiangular spirals too. I like Eminence a lot, but I've gotta say that the motor quality of the JBL's is hard to beat. Goo .......
468: High Efficiency Speaker Asylum, Re: Horn stuff and a post back for Tom (0.00)
Posted by Wayne Parham on 2002-07-09, 17:19:42 (63.52.150.43)
Hi Tom! You wrote: >> What your saying is correct then that the speaker, especially a >> point source direct radiator "moves around in time", it in effect >> moves front to back depending on frequency .......
469: High Efficiency Speaker Asylum, Re: Horn stuff and a post back for Tom (0.00)
Posted by Wayne Parham on 2002-07-09, 16:47:53 (63.52.150.43)
Hi Mark! You wrote: >> Upper referrs to the loudspeaker(s) covering the frequency range >> above the lower drivers. This could be the compression driver >> (upper) and midranges(lower), but could just .......
470: High Efficiency Speaker Asylum, Re: Horn stuff and a post back for Tom (0.00)
Posted by Wayne Parham on 2002-07-09, 12:39:52 (63.52.129.120)
Hello! You wrote: >> The Eminence driver in the LAB, as I understand it, is a custom >> piece made to Mr Danley's specs, not an off-the-shelf "Greek" >> series driver. That is my understanding too. >> .......
471: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-08, 16:37:21 (63.52.136.2)
John - Do you really think you're going to "prove" that a horn flare can provide acoustical loading through two decades? And by the way, how do you propose to solve for a non-symetrical flare? The mid .......
472: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-08, 12:45:35 (63.52.136.2)
John - Where's that FEA model? If you can't show the horn provides acoustic loading from 200Hz to 20Khz, then shut the f**k up. Wayne .......
473: High Efficiency Speaker Asylum, Re: Horn stuff and a post back for Tom (0.00)
Posted by Wayne Parham on 2002-07-08, 02:21:20 (63.52.128.104)
Hi Tom! You wrote: >> The upper and lower drivers DO NOT operate simultaneously except >> in the crossover region. From this discussion, I can see that you put a lot of effort into covering as many th .......
474: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-08, 02:01:00 (63.52.128.104)
Mike - What exactly did your last post have to do with this discussion? For that matter, what did any of your comments have to do with this discussion? Nothing. This thread was started with John posti .......
475: High Efficiency Speaker Asylum, Horn stuff and a post back for Tom (0.00)
Posted by Wayne Parham on 2002-07-07, 19:07:49 (63.52.128.104)
Hello again Tom! You wrote: >> Similarly When I have asked you at what point the explanation does >> not make sense, you do not reply. Again, my points of contention were as follows: 1. I do not belie .......
476: High Efficiency Speaker Asylum, Re: LOL (0.00)
Posted by Wayne Parham on 2002-07-07, 15:29:09 (63.52.136.75)
Hi John! Now we're getting somewhere! And the distance between these holes and the apex, where the compression driver is located? And the overlap region in the crossover? And the anomoly that you foun .......
477: High Efficiency Speaker Asylum, Re: LOL (0.00)
Posted by Wayne Parham on 2002-07-07, 14:54:45 (63.52.136.75)
Hi John! You wrote: >> What the hell are you talking about (leading edge behind trailing edge)? Notice that each midrange driver has an edge closer to the listener and an edge further from the liste .......
478: High Efficiency Speaker Asylum, Horn stuff and a final post to Tom (0.00)
Posted by Wayne Parham on 2002-07-07, 14:03:40 (63.52.136.75)
Hello Tom! I am disappointed that you never responded with any mathematical defense. Instead, you gave a list of events and accomplishments. Neat stuff, but none of it is relevant to the matter at han .......
479: High Efficiency Speaker Asylum, Re: LOL (0.00)
Posted by Wayne Parham on 2002-07-07, 12:47:15 (63.52.136.75)
Hey John - How about you join us in the debate. Please show us all how that midrange diaphragm in the Unity can have its leading edge driven behind the trailing edge, as far as phase is concerned. I g .......
480: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-07, 02:46:26 (63.52.129.58)
Hello again Tom! You wrote: >> I have been looking at a lot of old posts today, it seems that >> you have made dozens and dozens if not more posts about the Unity >> horn in the last year or so, you h .......
481: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-07, 02:08:32 (63.52.129.58)
Hello Mark! You wrote: >> Wayne, I have to ask if you actually read through and gave any >> thought to Tom's response in the post you are responding to here? ( http://www.audioasylum.com/forums/HUG/me .......
482: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-07, 01:39:22 (63.52.129.58)
Hi Mark! You wrote: >> In the 16.5" horn the midranges are loaded from about 300Hz well >> past 900Hz(three octaves) where the driver rolls off in the 1.2kHz >> range. A 1/4 wavelength of 1.2Khz is 2. .......
483: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-06, 15:05:37 (63.52.129.110)
Bates - You just can't keep from making it personal, can you? Well, OK then. How about telling us just how much penis envy goes into those monstrosities you build and drag around to every show you can .......
484: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-06, 14:23:07 (63.52.129.110)
Hello again Tom! You wrote: >> If not acting as an acoustic transformer, what then explains the >> impedance curves which clearly show "radiation resistance" and >> how then do the mid drivers reach a .......
485: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-06, 14:09:45 (63.52.129.110)
Hello Mark - You wrote: >> then please be more specific in what you see a problem with. Your >> comments claimed an INTERACTION between the output of the >> drive units. That is what I see a problem w .......
486: High Efficiency Speaker Asylum, Re: LOL (0.00)
Posted by Wayne Parham on 2002-07-06, 14:04:14 (63.52.129.110)
Go ahead Mike - Give us your technical evaluation. If you can. Wayne .......
487: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-06, 00:01:03 (63.52.131.14)
John - Exactly when - "after 1979" - do you think the laws of physics changed to make several radiating planar diaphragms act as a single, unified "point source?" And when - "after 1979" - do you beli .......
488: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-05, 17:47:03 (63.52.131.14)
You two are a gas! You defend your position that the device sums true, but then argue about what caused the anomaly I've referred to. Of course it's the geometry. When you've got two point sources th .......
489: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-05, 17:09:41 (63.52.131.14)
Hello John! You wrote: >> Nobody ever said that the TD-1 was horn loaded down to 80Hz. Where did this figure come from? >> That is something you incorrectly inferred. I've not mentioned this number, s .......
490: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-05, 16:59:24 (63.52.131.14)
Hello again Mark! I maintain the position that the Unity horn is not acting as an acoustic transformer for each of its drivers. I use similarly-shaped, large format conical horns as wideband devices t .......
491: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-05, 16:55:31 (63.52.131.14)
Mike - I don't appreciate your tone, and find your opportunistic position is disgusting. You know, the point you always drove into the ground with me and my designs, was my choice to push the upper li .......
492: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-05, 16:49:15 (63.52.131.14)
John - That was extremely rude. For you to call me a fraud, and then to have admitted that what I've said about frequency anomalies in this device is true, is absolutely inconceivable. Your words: >> .......
493: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-05, 16:28:43 (63.52.131.14)
Hello again Tom! Listen - I've read your work. Much of it is interesting. But I maintain the position that the Unity horn is not acting as an acoustic transformer for each of its drivers. I use simila .......
494: High Efficiency Speaker Asylum, Re: quarter wave resonance? (0.00)
Posted by Wayne Parham on 2002-07-05, 16:16:14 (63.52.131.14)
Hello again Mark! You wrote: >> The efficiency of the system is a function of the drive unit >> parameters and the spacial angle of the conical horn. Of course. But it is mostly set by the dimensions .......
495: High Efficiency Speaker Asylum, Re: JBL 2 way advice (0.00)
Posted by Wayne Parham on 2002-07-05, 15:47:39 (63.52.131.14)
Hi Vince and Freddy! I use the JBL 2426 or Eminence PSD2002 on an H290 horn flare in several models of π Speakers . The crossover I recommend is described in my crossover document , which is avail .......
496: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-05, 11:38:48 (63.52.129.65)
Hi John! You wrote: >> I am sorry you are having trouble accepting that the Unity acts as a point source. Not even a single driver acts as a point source; There is parallax across the diaphragm and wi .......
497: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-05, 11:23:20 (63.52.129.65)
Hi Dan! You wrote: >> Well, I know what horn theory says, but I also have had a chance >> to listen to some of these units (TD-1s) and it does work. Also, >> measurements don't lie - I'm sure Tom and .......
498: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-05, 11:10:52 (63.52.129.65)
Tom - You go throug a long diatribe that still misses the fundamental point. Phase is moving as frequency changes; The position of your drivers is fixed. Therefore, no "fix" of phase is possible. The .......
499: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-05, 01:34:40 (63.52.128.254)
Hi Dan! You wrote: >> I think the claim as listed is quite clear. It does not say >> sections ; it says segments . The language used in patents >> is quite precise, and you should not read any more in .......
500: High Efficiency Speaker Asylum, Re: From Wayne Parham - Re: Patentable claim (0.00)
Posted by Wayne Parham on 2002-07-04, 17:49:49 (63.52.131.91)
Hi Tom! You wrote: >> Not having heard one, that would seem to be a remarkable call to make. So, are you moving the discussion into the realm of the subjective, where we discuss what we think we hear .......
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