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1: High Efficiency Speaker Asylum, RE: SOTA 7 - 8 inch (0.00)
Posted by Bill Fitzmaurice on 2024-02-28, 08:03:15 (73.186.230.3)
I can't see why those would sound thin, being they have very good characteristics in the 200-800Hz range. If they have any shortcomings they'd be apparent on an RTA. Without seeing one an objective as .......
2: High Efficiency Speaker Asylum, RE: reference frequency calculator (0.00)
Posted by Bill Fitzmaurice on 2024-02-23, 11:13:40 (73.186.230.3)
I don't see the need for that. You get far more information using speaker modeling software. .......
3: High Efficiency Speaker Asylum, RE: Are there present standards for that segment, not home audio? (0.00)
Posted by Bill Fitzmaurice on 2024-02-18, 09:39:48 (73.186.230.3)
Not really. You see a lot more information, like polar response, because many pros want it, while most average consumers don't know what it means anyway. Interestingly the higher the price the more da .......
4: High Efficiency Speaker Asylum, RE: I am puzzled by some JBL. Tech sheets list measured at 15 feet (0.00)
Posted by Bill Fitzmaurice on 2024-02-18, 08:36:19 (73.186.230.3)
The key word is vintage. Before the 1970s, and in some cases even more recently, many manufacturers went by their own rules. EV, for instance, measured sensitivity at 4 feet. As for JBL, there was a p .......
5: High Efficiency Speaker Asylum, RE: "around 125dB" (0.00)
Posted by Bill Fitzmaurice on 2024-01-29, 08:07:27 (73.186.230.3)
I've been in bands since 1965, worked the FOH at a major concert venue where 110dB was the average for three years. My hearing tests fine, with an upper limit of 12kHz, which is normal for my age. I s .......
6: High Efficiency Speaker Asylum, RE: "around 125dB" (0.00)
Posted by Bill Fitzmaurice on 2024-01-29, 05:23:54 (73.186.230.3)
"It is my understanding that at 125db you will suffer immediate permanent hearing loss." It wouldn't be pleasant, and with extended exposure it would cause injury, but it wouldn't be immediate. One wo .......
7: High Efficiency Speaker Asylum, RE: Offset Driver in Hornresp; am I modeling this correctly? (0.00)
Posted by Bill Fitzmaurice on 2024-01-21, 06:20:11 (73.186.230.3)
It looks about right. The notch is where the input to the throat on the left and right sides are 180 degrees out of phase. So long as it occurs above the intended passband it doesn't matter. I use dri .......
8: High Efficiency Speaker Asylum, RE: ok, I guess I'll stick to the 2220h. Sim says I can get around 125dB before xmax (0.00)
Posted by Bill Fitzmaurice on 2024-01-14, 14:53:40 (73.186.230.3)
115dB is sufficient in a home setting. As for folds over 90 degrees, it doesn't matter with a sub. Reflectors aren't even necessary so long as the bend to bend distance is less than 1/4 wavelength. Fo .......
9: High Efficiency Speaker Asylum, RE: thanks. Looks like i need to study some more. I can see the possibilities (0.00)
Posted by Bill Fitzmaurice on 2024-01-13, 19:03:30 (73.186.230.3)
The 3015LF is a great subwoofer driver, for pro-sound folded horns. IMO and IME it makes no sense for use in the home. .......
10: High Efficiency Speaker Asylum, RE: I haven't looked at this stuff in years, I'm re-learning a lot (0.00)
Posted by Bill Fitzmaurice on 2024-01-09, 05:18:26 (73.186.230.3)
If you must go with a straight horn (and there's no justification for it) stand it up on end on legs. Your sim is too flat. With perfectly acceptable ripple it could go much lower. As for sitting back .......
11: High Efficiency Speaker Asylum, RE: Thanks! Might be a comfortable compromise (0.00)
Posted by Bill Fitzmaurice on 2024-01-06, 09:54:33 (73.186.230.3)
Reaching 40Hz with a folded horn isn't at all difficult. For one thing assuming it's going into a typical living room you can model in 1/8 space. In most cases you're going to be less than 1/2 wavelen .......
12: High Efficiency Speaker Asylum, RE: Puzzled by your two examples vs desired output range (0.00)
Posted by Bill Fitzmaurice on 2023-12-31, 14:06:55 (73.186.230.3)
HornResp does give an impedance curve, and just about anything else you could want. I never warmed up to AkAbak, so I can't say how they compare, but HornResp is very,very good. On the subject of the .......
13: High Efficiency Speaker Asylum, RE: Hornresp 1st pass - comments/critiques welcome. 40hz "L" horn (0.00)
Posted by Bill Fitzmaurice on 2023-12-30, 18:55:03 (73.186.230.3)
When using HornResp start with the Design Wizard > Hypex With Driver. That will give you the maximally flat alignment, and it will also be the largest possible box. Then you tweak the various paramete .......
14: High Efficiency Speaker Asylum, RE: Puzzled by your two examples vs desired output range (0.00)
Posted by Bill Fitzmaurice on 2023-12-30, 13:23:31 (73.186.230.3)
All horns are bandpass. One doesn't necessarily try to incorporate the high frequency knee into the design rather than use a crossover, but you can if you wish. HornResp makes it easy, as you can use .......
15: High Efficiency Speaker Asylum, RE: Is there anything in production similar to a JBL 2220 for horn loading? (0.00)
Posted by Bill Fitzmaurice on 2023-12-29, 04:56:27 (73.186.230.3)
Use this: http://www.loudspeakerdatabase.com/ .......
16: High Efficiency Speaker Asylum, RE: Peavey SP1 and SP2 Project Ideas..UPDATE, Plus these new weird things..? (0.00)
Posted by Bill Fitzmaurice on 2023-10-15, 06:02:02 (73.186.230.3)
If it has a twelve and fifteen sharing the same rear chamber air space it means the designer didn't know what he was doing. You might be able to salvage it by loading it with a pair of twelves, but it .......
17: High Efficiency Speaker Asylum, RE: Peavey SP1 and SP2 Project Ideas..UPDATE, Plus these new weird things..? (0.00)
Posted by Bill Fitzmaurice on 2023-10-14, 13:10:12 (73.186.230.3)
That software will tell you exactly what the response is, but it takes time to learn how to use it. If your shop has echo problems I'd be using a line array, either SLA Pro or TLAH Pro, depending on t .......
18: High Efficiency Speaker Asylum, RE: Peavey SP1 and SP2 Project Ideas..UPDATE, Plus these new weird things..? (0.00)
Posted by Bill Fitzmaurice on 2023-10-14, 03:55:38 (73.186.230.3)
You won't find any information about those Peaveys, but they're basically a dual woofer version of the JBL 4560A, which you can find. To determine suitable woofers you'd reverse engineer them with Hor .......
19: High Efficiency Speaker Asylum, RE: Built-in woofers... (0.00)
Posted by Bill Fitzmaurice on 2023-10-05, 11:40:57 (73.186.230.3)
Those rear chamber calculations don't work, because they don't consider what's actually happening. The mass of the air in the horn and front chamber adds to the Mms of the driver, which pushes the dri .......
20: High Efficiency Speaker Asylum, RE: Hey Bill F. High pass filter questions (0.00)
Posted by Bill Fitzmaurice on 2023-09-23, 08:21:08 (73.186.230.3)
It depends on the sub. The only way to be sure if it needs it is via software modeling to see the excursion at full power, ignoring below 20Hz, as there's not enough content down there to cause a prob .......
21: High Efficiency Speaker Asylum, RE: Would a 2/3 scale Belle w. Delta 10A have a usable top end past 1KHz? (0.00)
Posted by Bill Fitzmaurice on 2023-08-19, 11:41:34 (73.186.230.3)
Even a KHorn woofer is good to 400Hz, and it doesn't have rounded pathways. My DR250 woofer response is usable to 2kHz. I don't see 1kHz being a problem for you. .......
22: High Efficiency Speaker Asylum, RE: Any 15 with 96db for a f3 of 50 hz in a sealed box (0.00)
Posted by Bill Fitzmaurice on 2023-08-05, 04:57:20 (73.186.230.3)
That's pretty good, Fred. I wouldn't have thought of it, as it needs a 35 cu ft box for maximally flat response. .......
23: High Efficiency Speaker Asylum, RE: How about a 12? (0.00)
Posted by Bill Fitzmaurice on 2023-08-04, 18:05:36 (73.186.230.3)
The best f3 you'll get with the FW305 in a sealed box is 75Hz, with broadband sensitivity of 93dB. .......
24: High Efficiency Speaker Asylum, Altec 515B (0.00)
Posted by Bill Fitzmaurice on 2023-08-04, 11:37:17 (73.186.230.3)
No matter what size sealed box you put it in an Altec 515B f3 will never go lower than 115Hz. With a Qes of 0.18 you couldn't find a driver less suited to a sealed box or IB than the 515B if you tried .......
25: High Efficiency Speaker Asylum, RE: Any 15 with 96db for a f3 of 50 hz in a sealed box (0.00)
Posted by Bill Fitzmaurice on 2023-08-04, 09:08:59 (73.186.230.3)
I'm confident the answer is no. You can get that ported, but not sealed. .......
26: High Efficiency Speaker Asylum, RE: OB is very much a fringe niche. (0.00)
Posted by Bill Fitzmaurice on 2023-07-10, 11:08:48 (73.186.230.3)
No matter the shape any baffle that allows the front and rear waves to meet (without one or the other first having a 180 degree phase shift, for instance with bass reflex) will give the same result. : .......
27: High Efficiency Speaker Asylum, RE: The D130 (0.00)
Posted by Bill Fitzmaurice on 2023-07-10, 05:57:10 (73.186.230.3)
Thee D130 had very high sensitivity, due to it's low 0.25 Qes. That low Qes also choked off the low frequency response, as seen in the freddyi charts. Doubling the box size and driver count and reflex .......
28: High Efficiency Speaker Asylum, RE: a baffle needs to be 130" in length (0.00)
Posted by Bill Fitzmaurice on 2023-07-09, 12:13:20 (73.186.230.3)
The front and rear waves from the driver cancel each other below the frequency where the front and rear of the cone are separated by less than one-half wavelength. One-half wavelength at 40Hz is 14 fe .......
29: High Efficiency Speaker Asylum, RE: OB is very much a fringe niche. (0.00)
Posted by Bill Fitzmaurice on 2023-07-09, 05:15:33 (73.186.230.3)
Fringe for sure. OB appeals to counter-culture types, as in 'Boxes? Boxes??? We don't need no stinking boxes!' But if you're going to go low and loud you do need boxes. Even better, horns. ::: TOPIC: .......
30: High Efficiency Speaker Asylum, RE: Oh NO! (0.00)
Posted by Bill Fitzmaurice on 2023-06-16, 10:53:06 (73.186.230.3)
Probably. Go high enough and they'll be 0dB. .......
31: High Efficiency Speaker Asylum, RE: So does the reduced mass of air for a given volume (fewer molecules of air per cubic in/ft/meter)... (0.00)
Posted by Bill Fitzmaurice on 2023-06-16, 04:47:27 (73.186.230.3)
Air density determines the impedance load presented by the air. The higher impedance of denser air creates a more efficient energy transfer. It's the same thing that makes horns work. The higher air l .......
32: High Efficiency Speaker Asylum, RE: in a word: acceleration. (0.00)
Posted by Bill Fitzmaurice on 2023-06-12, 08:06:11 (73.186.230.3)
A diaphragm accelerates as fast as it needs to for the required excursion and frequency. In your example of 1mm in 1 millisecond vs. the same driver that moves 1mm in 10 microseconds they would not re .......
33: High Efficiency Speaker Asylum, in a word: acceleration. (0.00)
Posted by Bill Fitzmaurice on 2023-06-10, 08:03:45 (73.186.230.3)
Acceleration is a red herring. Yes, logically a lower mass diaphragm is more easily accelerated than one with more mass. That would be a concern if the electromotive force of a voice coil or electrost .......
34: High Efficiency Speaker Asylum, RE: What makes a driver High Efficiency? (0.00)
Posted by Bill Fitzmaurice on 2023-06-07, 13:29:06 (73.186.230.3)
Read my post again: "where they differ is mainly in the midrange, where subs don't operate." As for a Bryston or Powersoft not equaling or bettering a good tube amp, show us the evidence. That means m .......
35: High Efficiency Speaker Asylum, RE: What makes a driver High Efficiency? (0.00)
Posted by Bill Fitzmaurice on 2023-05-31, 07:49:53 (73.186.230.3)
>You can hear that different amp topologies You shouldn't, since where they differ is mainly in the midrange, where subs don't operate. SS where more power was needed and tubes where it wasn't was a c .......
36: High Efficiency Speaker Asylum, RE: All Done by Magnets! (0.00)
Posted by Bill Fitzmaurice on 2023-05-29, 11:46:44 (73.186.230.3)
Splitting hairs is what transducer engineers and loudspeaker designers do. It's how we make our living. Current is moot. What causes a cone to move is voltage. Unless you have a transconductance ampli .......
37: High Efficiency Speaker Asylum, RE: Harry Olson's analysis (0.00)
Posted by Bill Fitzmaurice on 2023-05-29, 08:34:36 (73.186.230.3)
Why horns have higher sensitivity, and why direct radiators have lower sensitivity, is simple: impedance. For efficient energy transfer you need a low impedance source and a high impedance load. That' .......
38: High Efficiency Speaker Asylum, RE: All Done by Magnets! (0.00)
Posted by Bill Fitzmaurice on 2023-05-29, 08:10:11 (73.186.230.3)
Current doesn't affect excursion. Voltage swing does. With a given voltage swing the cone/coil of a higher sensitivity driver will move further than a lower sensitivity driver. By the same token a low .......
39: High Efficiency Speaker Asylum, RE: All Done by Magnets! (0.00)
Posted by Bill Fitzmaurice on 2023-05-29, 05:18:12 (73.186.230.3)
The further the coil, and therefore the cone, moves the louder the sound. The faster it moves the higher the frequency. Neither has much to do with driver sensitivity. The strength of the magnet and t .......
40: High Efficiency Speaker Asylum, RE: I could simply match the drivers, no? (0.00)
Posted by Bill Fitzmaurice on 2023-05-28, 19:14:56 (73.186.230.3)
They are there for that purpose, though I would say -6dB is inadequate. Without seeing measured response it's only an educated guess. .......
41: High Efficiency Speaker Asylum, RE: I could simply match the drivers, no? (0.00)
Posted by Bill Fitzmaurice on 2023-05-28, 12:26:20 (73.186.230.3)
You're looking at two entirely different concerns. Crossover components are chosen to deliver the desired crossover frequency and slope with the specific impedance of the drivers being used. That has .......
42: High Efficiency Speaker Asylum, RE: I could simply match the drivers, no? (0.00)
Posted by Bill Fitzmaurice on 2023-05-28, 05:04:14 (73.186.230.3)
No. No matter which driver you use horn loading makes it more sensitive than the direct radiating woofer. The only way to level match them is via reduction of the input voltage to the HF driver, by ei .......
43: High Efficiency Speaker Asylum, RE: What makes a driver High Efficiency? (0.00)
Posted by Bill Fitzmaurice on 2023-05-27, 19:11:04 (73.186.230.3)
High sensitivity (high efficiency is the wrong term, but I doubt the forum wants to change the name) comes from a combination of factors, including high magnet strength and low moving mass. There are .......
44: High Efficiency Speaker Asylum, RE: "padded the level of the ... horns"? (0.00)
Posted by Bill Fitzmaurice on 2023-05-27, 19:04:46 (73.186.230.3)
LPad. .......
45: High Efficiency Speaker Asylum, RE: "padded the level of the ... horns"? (0.00)
Posted by Bill Fitzmaurice on 2023-05-27, 12:52:23 (73.186.230.3)
Even that is probably a bit hot. Being 16 ohms lowers their 2.83v sensitivity by 3dB, but that's still 11dB higher than the woofers. .......
46: High Efficiency Speaker Asylum, RE: "padded the level of the ... horns"? (0.00)
Posted by Bill Fitzmaurice on 2023-05-27, 04:57:25 (73.186.230.3)
Yes. The usual method is with an LPad. If you don't do that the HF horns will be some 10dB louder than the woofers, even after taking into account their higher impedance. .......
47: High Efficiency Speaker Asylum, RE: Determining overall speaker sensitivity (0.00)
Posted by Bill Fitzmaurice on 2023-05-26, 14:40:46 (73.186.230.3)
97dB.This assumes that you've padded the level of the HF horns to match the woofers, which is SOP. .......
48: High Efficiency Speaker Asylum, RE: follow up q (0.00)
Posted by Bill Fitzmaurice on 2023-05-21, 09:42:29 (73.186.230.3)
It's from EV, on the data sheet. They long used weird methods. After 1mW/30 feet they went to 50w/4 feet. They didn't go to 1w/1m until the 1990s. .......
49: High Efficiency Speaker Asylum, RE: EV Aristocrats / Seeking sensitivity info (0.00)
Posted by Bill Fitzmaurice on 2023-05-20, 12:16:19 (73.186.230.3)
To go from the old style RTMA sensitivity rating of 46.5dB 1mW/30 feet add 49dB, for a 1W/1M sensitivity of 95.5dB. .......
50: High Efficiency Speaker Asylum, RE: Masochists ? (0.00)
Posted by Bill Fitzmaurice on 2023-05-19, 14:46:32 (73.186.230.3)
Altecs were my favorite back in the day. I preferred them over JBL and EV. By the same token while I loved my BMW 2002 in 1972 I wouldn't want one today over my 328iX GT. They both have 2000cc engines .......
51: High Efficiency Speaker Asylum, RE: Masochists ? (0.00)
Posted by Bill Fitzmaurice on 2023-05-19, 12:59:59 (73.186.230.3)
The improvement also shows that the needs when the VOTT was invented aren't the same as those today. It was very much an empirical seat of the pants design, made to sound as good as possible with the .......
52: High Efficiency Speaker Asylum, RE: VOTT No bass, no treble (0.00)
Posted by Bill Fitzmaurice on 2023-05-18, 18:51:50 (73.186.230.3)
100 to 5kHz. This is an SPL plot of an A7, 1988 version. .......
53: High Efficiency Speaker Asylum, RE: Raw Tannoy drivers (0.00)
Posted by Bill Fitzmaurice on 2023-05-12, 13:00:28 (73.186.230.3)
JBL and EV also dropped out of the raw driver market some 20 years ago. They still sell a few, but not many. .......
54: High Efficiency Speaker Asylum, RE: Speakers Etc. Compression Tweeters....... (0.00)
Posted by Bill Fitzmaurice on 2023-05-09, 18:36:19 (73.186.230.3)
Which particular drivers? There are dozens of drivers that use a 1 3/8" screw mount. .......
55: High Efficiency Speaker Asylum, RE: 1st order crossover and horns? (0.00)
Posted by Bill Fitzmaurice on 2023-04-22, 05:50:08 (73.186.230.3)
Horns act as direct radiators at both ends of their passbands. In the lows where insufficient horn length and/or mouth area doesn't support horn loading, in the highs where the throat size is too larg .......
56: High Efficiency Speaker Asylum, RE: model the crossover (0.00)
Posted by Bill Fitzmaurice on 2023-04-21, 09:44:17 (73.186.230.3)
I use XSim, which works nicely. But you need the FRD and ZMA files, which requires testing gear if it's not published. .......
57: High Efficiency Speaker Asylum, RE: 1st order crossover and horns? (0.00)
Posted by Bill Fitzmaurice on 2023-04-21, 04:51:09 (73.186.230.3)
I don't see a 1st order making things any better. If anything it would be worse. .......
58: High Efficiency Speaker Asylum, RE: E-V CM 12-2 driver, rear view. (0.00)
Posted by Bill Fitzmaurice on 2023-04-11, 14:07:51 (73.186.230.3)
That magnet is pretty small, so Qes can't be very low. That means Mms would have to be low, therefore Fs high, for high sensitivity. Since it wasn't intended to do much below 100Hz that makes sense. I .......
59: High Efficiency Speaker Asylum, RE: Has anyone used this E-V CM12-2 12" coax in a hifi system? (0.00)
Posted by Bill Fitzmaurice on 2023-04-11, 08:53:19 (73.186.230.3)
It doesn't seem that they sold the raw driver. Odd that the data sheet doesn't even list the drivers used. .......
60: High Efficiency Speaker Asylum, RE: Has anyone used this E-V CM12-2 12" coax in a hifi system? (0.00)
Posted by Bill Fitzmaurice on 2023-04-11, 04:55:47 (73.186.230.3)
Since it's a floor monitor for live sound it probably doesn't have specs that allow it to go low, as you don't want that from a floor wedge. .......
61: High Efficiency Speaker Asylum, RE: Help with identifying horn sub (0.00)
Posted by Bill Fitzmaurice on 2023-03-29, 14:02:21 (73.186.230.3)
By the original definition a subwoofer plays below the range of a woofer. If this is an HD15 it's absolutely not a sub, it's a band pass woofer. .......
62: High Efficiency Speaker Asylum, RE: Help with identifying horn sub (0.00)
Posted by Bill Fitzmaurice on 2023-03-26, 05:29:19 (73.186.230.3)
Judging by the dimensions I doubt that they're subs. .......
63: High Efficiency Speaker Asylum, RE: Turmeric brands (0.00)
Posted by Bill Fitzmaurice on 2023-03-26, 05:26:11 (73.186.230.3)
I take a 500mg capsule with every meal. It's more effective if taken with black pepper, which is OK with me as I have black pepper as part of most meals. If you don't have black pepper as a regular pa .......
64: High Efficiency Speaker Asylum, RE: Think bit more info for focused answers (0.00)
Posted by Bill Fitzmaurice on 2023-03-24, 12:21:12 (73.186.230.3)
The cause for the screeching mids and highs shows up on the data sheet charts. Whether it's a back loaded horn, bass reflex or sealed box you have to combine the result up to roughly 200Hz from modeli .......
65: High Efficiency Speaker Asylum, RE: Why I'm Seldom Here. (0.00)
Posted by Bill Fitzmaurice on 2023-03-24, 08:55:06 (73.186.230.3)
You can get ground turmeric in just about any grocery store, but it's not something you want to eat as part of every meal, unless you're into Indian food. Capsules are a lot more user friendly. ::: TO .......
66: High Efficiency Speaker Asylum, RE: Why I'm Seldom Here. (0.00)
Posted by Bill Fitzmaurice on 2023-03-24, 08:52:13 (73.186.230.3)
Your doctor may or may not be aware of its benefits. It's a supplement, not a drug. Drug companies inundate doctors with sales pitches, it's what resulted in the opioid crisis. Supplement makers don't .......
67: High Efficiency Speaker Asylum, RE: Why I'm Seldom Here. (0.00)
Posted by Bill Fitzmaurice on 2023-03-24, 04:50:36 (73.186.230.3)
It may not help you, but turmeric has significantly reduced my back pain for the last twelve years. Before taking it I had periodic bouts of sciatica, I haven't had one since. I used to take Vicodin f .......
68: High Efficiency Speaker Asylum, RE: Think bit more info for focused answers (0.00)
Posted by Bill Fitzmaurice on 2023-03-22, 10:34:09 (73.186.230.3)
Why model it? Because if you know what you're doing you don't have to hear a speaker to know how it will sound. The same people who don't believe in modeling tend to not believe in the worth of measur .......
69: High Efficiency Speaker Asylum, RE: Lowther pma6 in folded horns (0.00)
Posted by Bill Fitzmaurice on 2023-03-21, 18:59:55 (73.186.230.3)
I've been using HornResp for at least 15 years now, and it just gets better and better. McBean adds a new revision at least once a month. It's not just for horns. It has features that make it worthwhi .......
70: High Efficiency Speaker Asylum, RE: Lowther pma6 in folded horns (0.00)
Posted by Bill Fitzmaurice on 2023-03-21, 14:55:51 (73.186.230.3)
"Magic's just science that we don't understand yet." Arthur C. Clarke. .......
71: High Efficiency Speaker Asylum, RE: Lowther pma6 in folded horns (0.00)
Posted by Bill Fitzmaurice on 2023-03-21, 04:42:43 (73.186.230.3)
The only way to predict how any driver will work in a given enclosure is via speaker modeling software. Where horns are concerned that's HornResp. .......
72: High Efficiency Speaker Asylum, RE: Midrange horn wings or baffle question (0.00)
Posted by Bill Fitzmaurice on 2023-03-21, 04:38:47 (73.186.230.3)
Lifting speakers off the floor by less than at least a foot has no effect on the low frequency response. It does improve the intelligibility of the mids, which can give the psycho-acoustic impression .......
73: High Efficiency Speaker Asylum, RE: Midrange horn wings or baffle question (0.00)
Posted by Bill Fitzmaurice on 2023-03-19, 06:02:51 (73.186.230.3)
Coupling with the floor is a matter of distance. Where the radiating plane is less than a quarter wavelength distant you get full coupling. Where bass horns are concerned it would be rare for them to .......
74: High Efficiency Speaker Asylum, RE: No Rez? No. (0.00)
Posted by Bill Fitzmaurice on 2023-03-18, 08:47:48 (73.186.230.3)
It has a heavy layer that doesn't do anything for a well constructed cabinet. The foam layer is OK, but no better than any other brand of foam. If it didn't cost four times what other materials do I'd .......
75: High Efficiency Speaker Asylum, RE: Damping material for Altec 817A horn (0.00)
Posted by Bill Fitzmaurice on 2023-03-14, 10:31:14 (73.186.230.3)
Fiberglass, specifically Type 700 rigid boards, is the most effective damping material. Fiberglass insulation should not be used, as it falls apart. .......
76: High Efficiency Speaker Asylum, RE: Damping material for Altec 817A horn (0.00)
Posted by Bill Fitzmaurice on 2023-03-14, 10:29:08 (73.186.230.3)
Foam is the least effective, being of the lowest density. Also note that pyramid foam consists of air in between the peaks, so it's effective thickness is much less than it appears to be. Then comes c .......
77: High Efficiency Speaker Asylum, RE: Damping material for Altec 817A horn (0.00)
Posted by Bill Fitzmaurice on 2023-03-14, 08:00:09 (73.186.230.3)
Fully lining the cab is standard procedure. Any internal reflections back to the cone will cause peaks and valleys in the response, although you may prefer the sound with said peaks and valleys. ::: T .......
78: High Efficiency Speaker Asylum, RE: Midrange horn wings or baffle question (0.00)
Posted by Bill Fitzmaurice on 2023-03-13, 14:27:46 (73.186.230.3)
I was never a Reagan fan, but I always trust (my ears) but verify (with measurements). .......
79: High Efficiency Speaker Asylum, RE: Midrange horn wings or baffle question (0.00)
Posted by Bill Fitzmaurice on 2023-03-13, 12:32:04 (73.186.230.3)
Getting the baffle step down low doesn't matter all that much. So long as the radiating plane is less than 1/2 wavelength from the wall behind the speaker you get quarter-space loading anyway, which a .......
80: High Efficiency Speaker Asylum, RE: Midrange horn wings or baffle question (0.00)
Posted by Bill Fitzmaurice on 2023-03-13, 12:29:11 (73.186.230.3)
I think you missed the point. Tales abound of those who've read response way below what it should have been, only to discover they were reading HVAC equipment. I was perplexed when I started taking RT .......
81: High Efficiency Speaker Asylum, RE: Midrange horn wings or baffle question (0.00)
Posted by Bill Fitzmaurice on 2023-03-13, 09:12:03 (73.186.230.3)
As pictured the wings on the LF box would lower the baffle step frequency, but only to 250Hz or so. .......
82: High Efficiency Speaker Asylum, RE: Did I not disconnect the first driver to test it? (0.00)
Posted by Bill Fitzmaurice on 2023-03-11, 11:43:20 (73.186.230.3)
Not disconnecting it probably explains the erroneous reading. .......
83: High Efficiency Speaker Asylum, RE: Just as a point of interest (0.00)
Posted by Bill Fitzmaurice on 2023-03-11, 09:54:34 (73.186.230.3)
I'm confused. Did you not disconnect the first driver to test it? .......
84: High Efficiency Speaker Asylum, RE: Not a recone (0.00)
Posted by Bill Fitzmaurice on 2023-03-10, 09:12:57 (73.186.230.3)
If it's not a recone then it's mis-marked. Or your meter is NFG. .......
85: High Efficiency Speaker Asylum, RE: My JBL 2226J measures 8 Ohms across the terminals (0.00)
Posted by Bill Fitzmaurice on 2023-03-10, 08:39:28 (73.186.230.3)
DCR of the 2226J is 12 ohms. If you're reading 8 ohms it must have been re-coned to a 2226H. That should read 6 ohms, so it may have been done with an aftermarket coil. .......
86: High Efficiency Speaker Asylum, RE: Midrange horn wings or baffle question (0.00)
Posted by Bill Fitzmaurice on 2023-03-09, 10:56:56 (73.186.230.3)
Tom, according to the EDS data sheets the T35,T350 and 8HD were diffraction horns that always should have been vertically aligned. It's long been a puzzlement why Paul Klipsch mounted them horizontall .......
87: High Efficiency Speaker Asylum, RE: Midrange horn wings or baffle question (0.00)
Posted by Bill Fitzmaurice on 2023-03-09, 04:43:01 (73.186.230.3)
At and above the frequency where the baffle is one wavelength in dimension all of the energy is directed forward. Below that frequency it wraps around the horn. This occurs on both the horizontal and .......
88: High Efficiency Speaker Asylum, RE: Midrange horn wings or baffle question (0.00)
Posted by Bill Fitzmaurice on 2023-03-08, 05:31:37 (73.186.230.3)
A baffle one wavelength in dimension at the crossover frequency will improve response. A wavelength at 500Hz is 2.25 feet, so that's practical. At 50Hz a wavelength is 22.5 feet, so that's not. ::: T .......
89: High Efficiency Speaker Asylum, RE: At times I wonder if we would had gotten a Khorn if software existed (0.00)
Posted by Bill Fitzmaurice on 2023-02-07, 14:02:41 (73.186.230.3)
With software he wouldn't have needed the 'rubber throat', knowing without having to experiment what size throat would give the best result. .......
90: High Efficiency Speaker Asylum, RE: Interesting creation Altec folded horn bass with horn tweeter, comments? (0.00)
Posted by Bill Fitzmaurice on 2023-02-06, 19:20:44 (73.186.230.3)
I can't tell for sure from the picture but I don't think it opens up that dead area to the front chamber. It doesn't seem to be the case comparing it to this picture by Volvotreter. .......
91: High Efficiency Speaker Asylum, RE: The Curse of CCA (copper clad aluminium). I took an oath! (0.00)
Posted by Bill Fitzmaurice on 2023-02-06, 12:17:00 (73.186.230.3)
It's not what you make it out of, it's how you make it that counts. Even pure aluminum is used in some very high end drivers, like JBL. .......
92: High Efficiency Speaker Asylum, RE: Interesting creation Altec folded horn bass with horn tweeter, comments? (0.00)
Posted by Bill Fitzmaurice on 2023-02-06, 09:46:50 (73.186.230.3)
The extension to the horn length and mouth area provided by the cabinet would allow an 811 to go to 500Hz, if not lower. .......
93: High Efficiency Speaker Asylum, RE: Kind of a cheap knockoff of a Hartsfield.* (0.00)
Posted by Bill Fitzmaurice on 2023-02-04, 12:59:04 (73.186.230.3)
The KHorn pre-dated the Hartsfield by six years. Where knocking off is concerned JBL was just different enough to avoid prior art problems. .......
94: High Efficiency Speaker Asylum, RE: Somehow the Khorn 3d folding has always been hard to visualize (0.00)
Posted by Bill Fitzmaurice on 2023-02-04, 12:47:13 (73.186.230.3)
It's hard to visualize for sure. '2d' is usually a constant width horn, so a simple side view tells you all you need to know. The issue with constant width horns is resonance coloration when the width .......
95: High Efficiency Speaker Asylum, RE: Do you feel that the additions hurt design? (0.00)
Posted by Bill Fitzmaurice on 2023-02-04, 10:38:24 (73.186.230.3)
They have no sonic effect, probably serve as braces. .......
96: High Efficiency Speaker Asylum, RE: On the tweeter horn extension another question (0.00)
Posted by Bill Fitzmaurice on 2023-02-04, 08:35:48 (73.186.230.3)
That contouring wouldn't make much, if any, difference. Looks like cork to me. .......
97: High Efficiency Speaker Asylum, RE: Interesting creation Altec folded horn bass with horn tweeter, comments? (0.00)
Posted by Bill Fitzmaurice on 2023-02-04, 05:58:21 (73.186.230.3)
It's an Altec loaded KHorn with an 811B sectoral horn on top rather than Klipsch/EV horns. The extension of the HF horn will have a slight effect at the lower end of its passband, but its purpose is m .......
98: High Efficiency Speaker Asylum, RE: Altec Model 14 2k crossover designed by Richard C. (0.00)
Posted by Bill Fitzmaurice on 2023-01-27, 09:26:32 (73.186.230.3)
Regarding air versus solid cored, tests were done some 20 years ago to find the coil with the lowest THD etc. It was the Madisound Sledgehammer, solid core. Going from 0.1 to 0.3 ohms wouldn't be audi .......
99: High Efficiency Speaker Asylum, RE: two?! (0.00)
Posted by Bill Fitzmaurice on 2023-01-24, 12:08:28 (73.186.230.3)
You can't smooth room modes and boundary cancellations with one sub. .......
100: High Efficiency Speaker Asylum, RE: Altec Model 14 2k crossover designed by Richard C. (0.00)
Posted by Bill Fitzmaurice on 2023-01-21, 06:10:07 (73.186.230.3)
I always keep the DCR at 5% or less of the driver nominal impedance. With larger value air cores that can get expensive. Use them if you wish, but the prejudice against solid core isn't justified. The .......
101: High Efficiency Speaker Asylum, RE: In my 20's I could hear the ultrasonic burglar alarm where I worked... (0.00)
Posted by Bill Fitzmaurice on 2023-01-16, 08:52:16 (73.186.230.3)
Piezo horns constantly playing alternating high-frequency tones at 16-18.5 kHz are common in the UK. They're called teenager repellents. .......
102: High Efficiency Speaker Asylum, RE: Variable tweeter attenuator? (0.00)
Posted by Bill Fitzmaurice on 2023-01-16, 05:31:14 (73.186.230.3)
I'm not aware of any. It has to be an LPad, which keeps a constant load impedance seen by the crossover high pass, other wise the transfer function will be AFU. Stepped attentuators exist for line lev .......
103: High Efficiency Speaker Asylum, RE: Ping tomservo regarding US patent US4845759A (0.00)
Posted by Bill Fitzmaurice on 2023-01-11, 04:53:11 (73.186.230.3)
They don't have more output than the sum of their individual outputs. Where a source is more than three wavelengths in dimension it operates in the near field, so the SPL reduction with doubling of di .......
104: High Efficiency Speaker Asylum, RE: Ping tomservo regarding US patent US4845759A (0.00)
Posted by Bill Fitzmaurice on 2023-01-10, 11:11:59 (73.186.230.3)
I'm not speaking for Tom, but what you describe isn't a point source, it's a line source. .......
105: High Efficiency Speaker Asylum, RE: "operate on the quantum mechanical level" (0.00)
Posted by Bill Fitzmaurice on 2023-01-07, 11:36:32 (73.186.230.3)
The first time I saw the description of what Bybees supposedly do I thought it was a joke. I still do. .......
106: High Efficiency Speaker Asylum, RE: Home EQ Wizard.... (0.00)
Posted by Bill Fitzmaurice on 2022-12-22, 08:39:56 (73.186.230.3)
https://www.hometheatershack.com/threads/room-eq-wizard-rew-information-index-links-guides-technical-articles-please-read.11707/ .......
107: High Efficiency Speaker Asylum, RE:Because they like the sound, (0.00)
Posted by Bill Fitzmaurice on 2022-12-22, 05:01:37 (73.186.230.3)
If all I wanted was to equal EVM15L performance I'd use a new Delta Pro 15 for the same price. But that's moot, because the OP stated that he only wanted to go down to 80Hz. That being the case I'd us .......
108: High Efficiency Speaker Asylum, RE: They do look like Fisher speakers nt (0.00)
Posted by Bill Fitzmaurice on 2022-12-05, 19:02:59 (73.186.230.3)
The 6B being a 2x12 was larger than the competing 1x10s or 1z12s, but still considerably smaller than, say, any of the Patrician versions. .......
109: High Efficiency Speaker Asylum, RE: Dayton Audio DC300-8 might work (0.00)
Posted by Bill Fitzmaurice on 2022-12-03, 14:25:48 (73.186.230.3)
As would I, which takes us back to learning how to use modeling software. On the subject of the death of acoustic suspension, I was touring in '73, had left my stereo with my girlfriend in Boston, .......
110: High Efficiency Speaker Asylum, RE: Dayton Audio DC300-8 might work (0.00)
Posted by Bill Fitzmaurice on 2022-12-03, 09:31:27 (73.186.230.3)
Price isn't the issue with high Qes drivers. If anything high Qes tends to be most common in the lower price range. It's the combination of high Qes, an inexpensive driver trait, with high Xmax, an ex .......
111: High Efficiency Speaker Asylum, RE: Dayton Audio DC300-8 might work (0.00)
Posted by Bill Fitzmaurice on 2022-12-03, 05:42:44 (73.186.230.3)
The Qes/Qts are too low, Vas too small and xmax too short for acoustic suspension. .......
112: High Efficiency Speaker Asylum, RE: Electro voice driver question (0.00)
Posted by Bill Fitzmaurice on 2022-12-02, 14:02:40 (73.186.230.3)
If the original woofers weren't EV there's no reason to want to replace them with EV. If EV ever made an acoustic suspension woofer I'm not aware of it. It just wasn't their thing. Back in '69 you did .......
113: High Efficiency Speaker Asylum, RE: Electro voice driver question (0.00)
Posted by Bill Fitzmaurice on 2022-12-02, 12:01:11 (73.186.230.3)
Wolverines and SP12s have too low Qes and too high Fs for an acoustic suspension cab. .......
114: High Efficiency Speaker Asylum, RE: Electro voice driver question (0.00)
Posted by Bill Fitzmaurice on 2022-12-01, 12:22:38 (73.186.230.3)
Still no way of knowing. Stamped frame alnico drivers of that era all looked pretty much the same. .......
115: High Efficiency Speaker Asylum, RE: Electro voice driver question (0.00)
Posted by Bill Fitzmaurice on 2022-12-01, 10:28:05 (73.186.230.3)
That could be just about anything, maybe CTS, maybe Utah, maybe Jensen. What it probably is not would be EV. .......
116: High Efficiency Speaker Asylum, RE: Electro voice driver question - crossover (0.00)
Posted by Bill Fitzmaurice on 2022-11-30, 09:24:38 (73.186.230.3)
The engineering data sheet says it's an 8 ohm speaker, so the woofers must be 4 ohm. The padding resistor would be to tame the midrange driver, as the acoustic suspension woofers would have low sensit .......
117: High Efficiency Speaker Asylum, RE: Electro voice driver question (0.00)
Posted by Bill Fitzmaurice on 2022-11-30, 05:06:52 (73.186.230.3)
If one of them is a passive it's because somebody replaced the original driver with a passive. The data sheet is quite clear that it uses two twelve inch woofers. Stuffing is a must. Fiberglass insula .......
118: High Efficiency Speaker Asylum, RE: Electro voice driver question (0.00)
Posted by Bill Fitzmaurice on 2022-11-29, 18:56:17 (73.186.230.3)
The EV engineering data sheet doesn't say what drivers were used. Replacing them would be a matter of using speaker modeling software,like WinISD,to find a good match for the cabinet dimensions. You'd .......
119: High Efficiency Speaker Asylum, RE:It is inside professional stage monitors. (0.00)
Posted by Bill Fitzmaurice on 2022-11-29, 09:50:35 (73.186.230.3)
That would be an appropriate use, where the listening position is so close that you really benefit from the coincident LF and HF sources. Bass response isn't required, nor even desired from a stage we .......
120: High Efficiency Speaker Asylum, RE: The Cat loved it ,,,, (0.00)
Posted by Bill Fitzmaurice on 2022-11-26, 08:44:41 (73.186.230.3)
I'm not sure he can read English either. For sure he's never read 'How to Win Friends and Influence People'. :) .......
121: High Efficiency Speaker Asylum, RE: When is a Horn Not a Horn? (0.00)
Posted by Bill Fitzmaurice on 2022-11-25, 06:09:19 (73.186.230.3)
> He aims the compression driver straight up by placing it on top of the speaker cab and he removes the horn - is that ingenious? No, it's not. What it shows is that he doesn't know what he's doing. H .......
122: High Efficiency Speaker Asylum, RE: Voice of Lancelot ( VOL ) speakers ,,,,,,,,, (0.00)
Posted by Bill Fitzmaurice on 2022-11-24, 08:18:58 (73.186.230.3)
To quote George Augsperger, "There are a hundred ways to build a bass reflex loudspeaker. This is one of them." .......
123: High Efficiency Speaker Asylum, RE: I don't think modeling would tell the whole story on this odd driver (0.00)
Posted by Bill Fitzmaurice on 2022-11-23, 05:12:37 (73.186.230.3)
The horn will have minimal effect on the cone radiation below the frequency where its diameter is one wavelength. That appears to be roughly ten inches, which is one wavelength at 1350Hz. ::: TOPIC:: .......
124: High Efficiency Speaker Asylum, RE: Has someone used this RCF speaker in a project? (0.00)
Posted by Bill Fitzmaurice on 2022-11-20, 08:29:01 (73.186.230.3)
Model it in your favorite box program, like WinISD. Then you'll know from an objective standpoint what it will do, rather than relying on someone's subjective opinion. .......
125: High Efficiency Speaker Asylum, RE: I guess this makes a woofer with back chamber UNtrue? NT (0.00)
Posted by Bill Fitzmaurice on 2022-11-07, 10:22:32 (73.186.230.3)
What happens with a horn that doesn't happen with a direct radiator is that the air mass within the horn lowers the effective driver resonant frequency, in a similar fashion to a dual chamber band pas .......
126: High Efficiency Speaker Asylum, RE: I guess this makes a woofer with back chamber UNtrue? NT (0.00)
Posted by Bill Fitzmaurice on 2022-10-30, 08:04:41 (73.186.230.3)
:) .......
127: High Efficiency Speaker Asylum, RE: "Polite" speakers (0.00)
Posted by Bill Fitzmaurice on 2022-10-27, 14:49:31 (73.186.230.3)
It bears seeing again from time to time. .......
128: High Efficiency Speaker Asylum, RE: 511b Horns in front of kick drums?. What is that about? (0.00)
Posted by Bill Fitzmaurice on 2022-10-02, 11:22:37 (73.186.230.3)
Ludwig 'Lips and Mouths' kit. .......
129: High Efficiency Speaker Asylum, RE: "Polite" speakers (0.00)
Posted by Bill Fitzmaurice on 2022-09-24, 05:21:20 (73.186.230.3)
He uses silver because his customers think it will make a difference and are willing to pay the price for it. Clearly you have drunk the Kool-aid, and since you'd rather argue than learn I won't respo .......
130: High Efficiency Speaker Asylum, RE: "Polite" speakers (0.00)
Posted by Bill Fitzmaurice on 2022-09-23, 09:58:04 (73.186.230.3)
Audio magazines and websites exist for the purpose of making money, which comes from advertising. Wire manufacturers and sellers are major advertisers, so they're not going to bite the hand that feeds .......
131: High Efficiency Speaker Asylum, RE: "Polite" speakers (0.00)
Posted by Bill Fitzmaurice on 2022-09-23, 07:15:19 (73.186.230.3)
I'm an acoustical engineer, of course I've tried silver wire, along with Litz wire and any number of other configurations. There are three factors that influence how wire works: resistance, inductance .......
132: High Efficiency Speaker Asylum, RE: "Polite" speakers (0.00)
Posted by Bill Fitzmaurice on 2022-09-22, 13:13:40 (73.186.230.3)
I can't comment on polite versus rude speakers, but without question horns have far lower distortion than direct radiators. That's the result of both lower excursion from the driver and less power fro .......
133: High Efficiency Speaker Asylum, RE: Tannoy 385 efficiency (0.00)
Posted by Bill Fitzmaurice on 2022-09-19, 13:38:56 (73.186.230.3)
There's only one way to find out. .......
134: High Efficiency Speaker Asylum, RE: Tannoy 385 efficiency (0.00)
Posted by Bill Fitzmaurice on 2022-09-19, 12:03:31 (73.186.230.3)
Unless there's seriously wrong with a given amp there should be very little difference in response with different amps when played at the same level. Damping factor isn't a consideration. .......
135: High Efficiency Speaker Asylum, RE: Cabinet Plans For RCA LC1 Drivers (0.00)
Posted by Bill Fitzmaurice on 2022-09-07, 04:51:51 (73.186.230.3)
Since the LC1 pre-date T/S specs by decades the original cab would have been a seat of the pants design. It would be best to measure their specs and use speaker modeling software to come up with an op .......
136: High Efficiency Speaker Asylum, RE: Not quite clear on some of your details (0.00)
Posted by Bill Fitzmaurice on 2022-08-22, 10:28:50 (73.186.230.3)
It may look that way, but the size of the box is rather large, which impacts the tuning frequency to the same degree that the total port area does. Judging by the age of the design I doubt Fs is lower .......
137: High Efficiency Speaker Asylum, RE: Not quite clear on some of your details (0.00)
Posted by Bill Fitzmaurice on 2022-08-20, 19:34:26 (73.186.230.3)
The nominal velocity of a 2x2 inch versus four 1x1 inch square ports will be the same. .......
138: High Efficiency Speaker Asylum, RE: Sorry when you referenced area ,I was reading volume (0.00)
Posted by Bill Fitzmaurice on 2022-08-20, 14:12:39 (73.186.230.3)
The mach value is determined by area...repeat, area...so it doesn't matter if it's one port or a dozen, port speed will be relatively constant with constant total area. Relatively, because there's a r .......
139: High Efficiency Speaker Asylum, RE: ".... one port of equal area" bit unclear as with two ports the length is doubled (0.00)
Posted by Bill Fitzmaurice on 2022-08-19, 19:13:28 (73.186.230.3)
As an example five 4 square inch ports is the same as one 20 square inch port or twenty 1 inch square ports. Judging by the OP's picture it appears that they used five smaller area ports rather than o .......
140: High Efficiency Speaker Asylum, RE: 5 ports??? What is the tuning frequency? (0.00)
Posted by Bill Fitzmaurice on 2022-08-19, 10:45:47 (73.186.230.3)
The same as it would be with one port of equal area. .......
141: High Efficiency Speaker Asylum, RE: Coral bx-710 8 ohm cabinet but 16 ohm horn? (0.00)
Posted by Bill Fitzmaurice on 2022-08-17, 19:40:07 (73.186.230.3)
For sure I'd replace those NPEs with polys. .......
142: High Efficiency Speaker Asylum, RE: Coral bx-710 8 ohm cabinet but 16 ohm horn? (0.00)
Posted by Bill Fitzmaurice on 2022-08-17, 19:39:27 (73.186.230.3)
Don't worry. Altecs among others used 16 ohm drivers crossed over at 500 Hz. .......
143: High Efficiency Speaker Asylum, RE: Coral bx-710 8 ohm cabinet but 16 ohm horn? (0.00)
Posted by Bill Fitzmaurice on 2022-08-17, 13:00:58 (73.186.230.3)
Many speakers used 16 ohm HF horns along with 8 ohm woofers, to reduce the sensitivity in the highs. Using them on 8 ohm tube amp taps generally doesn't cause a problem. .......
144: High Efficiency Speaker Asylum, RE: Altec A7's for home use (0.00)
Posted by Bill Fitzmaurice on 2022-08-01, 19:52:07 (73.186.230.3)
Those are reproductions, possibly by the same person who did these: .......
145: High Efficiency Speaker Asylum, RE: JBL E 145 (0.00)
Posted by Bill Fitzmaurice on 2022-07-24, 05:24:44 (73.186.230.3)
Ampeg used a number of musical instrument drivers, including CTS, Jensen, Utah and Altec. The B-15 sounded better than most because it had a much better tone control section. I played B-15s side by si .......
146: High Efficiency Speaker Asylum, RE: Not exactly (0.00)
Posted by Bill Fitzmaurice on 2022-07-21, 10:46:55 (73.186.230.3)
That's not even close to the E 145, primarily due to the much higher Qes and much lower Vas. Not that that's a bad thing, it isn't, but still...It is close to the Eminence Kappalite 3015LF, which I ha .......
147: High Efficiency Speaker Asylum, RE: JBL E 145 (0.00)
Posted by Bill Fitzmaurice on 2022-07-21, 08:44:54 (73.186.230.3)
It wasn't a guitar speaker, that would have been the E130. The E145 was an electric bass speaker. While probably the best electric bass speaker of its day that day was 40 years ago. The Eminence Kappa .......
148: High Efficiency Speaker Asylum, RE: Cube Nenuphar Speakers (0.00)
Posted by Bill Fitzmaurice on 2022-07-18, 19:06:42 (73.186.230.3)
Slightly boomy in the midbass, a bit weak off-axis in the lower midrange and highs. A 30 degree plot would help, as the usual criteria for good off-axis response is no more than -6dB from axial at 30 .......
149: High Efficiency Speaker Asylum, RE: knows what he's talking about (0.00)
Posted by Bill Fitzmaurice on 2022-07-18, 10:54:33 (73.186.230.3)
I'm not alone by any means, you've got a firm grasp on reality too, and there are others. But we're greatly outnumbered. .......
150: High Efficiency Speaker Asylum, RE:Because they like the sound, (0.00)
Posted by Bill Fitzmaurice on 2022-07-17, 05:15:56 (73.186.230.3)
I care what you think, as yours is a voice of reason. There's too little of that these days. .......
151: High Efficiency Speaker Asylum, RE: Cube Nenuphar Speakers (0.00)
Posted by Bill Fitzmaurice on 2022-07-17, 05:10:34 (73.186.230.3)
Acoustics, the science concerned with the production, control, transmission, reception, and effects of sound. The term is derived from the Greek akoustos, meaning "heard." The more you post the more o .......
152: High Efficiency Speaker Asylum, RE: Cube Nenuphar Speakers (0.00)
Posted by Bill Fitzmaurice on 2022-07-16, 08:49:53 (73.186.230.3)
I have no conclusions, since they do not have reliable data posted. But as for your understanding what you're hearing, more often than not people do not. One learns this when one studies acoustical en .......
153: High Efficiency Speaker Asylum, RE: Cube Nenuphar Speakers (0.00)
Posted by Bill Fitzmaurice on 2022-07-16, 07:50:45 (73.186.230.3)
No one can listen to a speaker and from that draw charts. However, one trained in the science of audio reproduction can look at the charts and know how it will sound. The science always works, whether .......
154: High Efficiency Speaker Asylum, RE:Because they like the sound, (0.00)
Posted by Bill Fitzmaurice on 2022-07-15, 11:06:06 (73.186.230.3)
Intentionally or not you did just that when you described me as objective, and yourself as subjective. I'm both objective and subjective. If you're going to be successful as a speaker designer, which .......
155: High Efficiency Speaker Asylum, RE:Because they like the sound, (0.00)
Posted by Bill Fitzmaurice on 2022-07-15, 09:39:26 (73.186.230.3)
Having compared the 3015 side by side to the 2226, 421 and EVM 15L it doesn't give up a thing to any of them. That's with my ears as well as my instruments. It's always amusing when those who don't .......
156: High Efficiency Speaker Asylum, RE:Because they like the sound, (0.00)
Posted by Bill Fitzmaurice on 2022-07-15, 05:05:29 (73.186.230.3)
Because they like the sound isn't a good reason to spend six times what they need to. If one believes that more expensive always means better then fine, spend away. If one believes that fifty year old .......
157: High Efficiency Speaker Asylum, RE: Too much Nostalgia methinks, and not real performance. (0.00)
Posted by Bill Fitzmaurice on 2022-07-12, 07:35:53 (73.186.230.3)
+1. Now if I could only find a Studebaker for my daily drive. .......
158: High Efficiency Speaker Asylum, RE: Ultimate 15 inch driver build. (0.00)
Posted by Bill Fitzmaurice on 2022-07-10, 19:07:33 (73.186.230.3)
"You can get Pro drivers with Neo magnets today for much less $$ that will outperform them in the right horn or custom bass reflex box." Amen to that, especially when modern drivers have Vas a third t .......
159: High Efficiency Speaker Asylum, RE: Cube Nenuphar Speakers (0.00)
Posted by Bill Fitzmaurice on 2022-07-04, 19:05:17 (73.186.230.3)
I'm an acoustical engineer. I expect to see engineering data on a $1500 speaker, let alone a $15k speaker. They show none, just advertising piffle. .......
160: High Efficiency Speaker Asylum, RE: Loudspeaker Database (0.00)
Posted by Bill Fitzmaurice on 2022-07-04, 12:39:20 (73.186.230.3)
It's a very good resource, if you know how to software model drivers in an enclosure. Otherwise not so much, and you won't find vintage drivers on it. .......
161: High Efficiency Speaker Asylum, RE: Cube Nenuphar Speakers (0.00)
Posted by Bill Fitzmaurice on 2022-06-27, 10:42:22 (73.186.230.3)
Company websites and reviews that don't contain verifiable measurements aren't worth the pixels they appear in, even at reasonable prices. Would you buy a $150k car without even knowing how many horse .......
162: High Efficiency Speaker Asylum, Sigh... "the replacement for displacement is a horn" Paul Klipsch.~nT (0.00)
Posted by Bill Fitzmaurice on 2022-06-26, 09:41:04 (73.186.230.3)
NT. .......
163: High Efficiency Speaker Asylum, RE: Cube Nenuphar Speakers (0.00)
Posted by Bill Fitzmaurice on 2022-06-24, 12:04:37 (73.186.230.3)
IMO the Cube webpage could have been created by P.T. Barnum. .......
164: High Efficiency Speaker Asylum, RE: No Truth. Only Fanatical Religious fervor.. in Audio Weenie Land (0.00)
Posted by Bill Fitzmaurice on 2022-06-01, 09:29:40 (73.186.230.3)
They can't forget what they never learned. .......
165: High Efficiency Speaker Asylum, RE: Identification Of Constant Directivity (CD) Horns ? (0.00)
Posted by Bill Fitzmaurice on 2022-05-29, 14:44:12 (73.186.230.3)
CD horns tend to have a rapid vertical flare near the throat, transitioning to a less rapid horizontal flare. Since all horns are band pass most will tend to sound better with HF EQ boost. ::: TOPIC:: .......
166: High Efficiency Speaker Asylum, RE: spell Hofmann's name correctly (0.00)
Posted by Bill Fitzmaurice on 2022-05-27, 07:02:36 (73.186.230.3)
Tony never made a big deal about the misspelling of his name, which he knew was because of the fame of that other Hoffman, Dustin. It's difficult to separate the contributions to the art made by Hofma .......
167: High Efficiency Speaker Asylum, RE: Break in time (0.00)
Posted by Bill Fitzmaurice on 2022-05-26, 10:59:20 (73.186.230.3)
For sure, but don't try telling that to those who insist that 'I know what I'm hearing'. .......
168: High Efficiency Speaker Asylum, RE: Break in time (0.00)
Posted by Bill Fitzmaurice on 2022-05-26, 06:31:55 (73.186.230.3)
2 hours might be OK, I always used overnight just to be sure. One quirk is that after a driver sits unused for a while it will stiffen up. However, it only takes a short while to loosen again. After b .......
169: High Efficiency Speaker Asylum, RE: Break in time (0.00)
Posted by Bill Fitzmaurice on 2022-05-26, 04:56:25 (73.186.230.3)
I break in woofers overnight, using a sine wave somewhat lower than Fs just sufficient to bring the excursion close to xmax. This has never failed to bring Fs down to spec. If Fs is good the rest will .......
170: High Efficiency Speaker Asylum, RE: No Truth. Only Fanatical Religious fervor.. in Audio Weenie Land (0.00)
Posted by Bill Fitzmaurice on 2022-05-25, 19:29:00 (73.186.230.3)
The science always works, whether you understand it or not. .......
171: High Efficiency Speaker Asylum, RE: But is that break-in measureable? (0.00)
Posted by Bill Fitzmaurice on 2022-05-23, 07:50:30 (73.186.230.3)
It can be measured. Fs, Qms and Vas will change, due to the softening of the suspension via flexing. It changes the most with woofers, since they have the most excursion, the least with tweeters as th .......
172: High Efficiency Speaker Asylum, RE: Compression Driver Diaphragm Break In ? (0.00)
Posted by Bill Fitzmaurice on 2022-05-22, 05:39:13 (73.186.230.3)
All drivers break in, just as all shoes break in, and for the same reason. How much break in occurs varies from quite a lot with some woofers to imperceptible with high frequency drivers. .......
173: High Efficiency Speaker Asylum, RE: Hornresp (0.00)
Posted by Bill Fitzmaurice on 2022-05-14, 10:26:55 (73.186.230.3)
I'm sure that Danley would have wanted to use HornResp in its current form even 20 years ago. As I understand it he used AkAbak with the first generation of tapped horns. HornResp at that time lacked .......
174: High Efficiency Speaker Asylum, RE: LA Scala with an Altec 515 (0.00)
Posted by Bill Fitzmaurice on 2022-05-13, 19:40:48 (73.186.230.3)
Model it with HornResp. The days of having to actually put a driver into a horn to know how it will function ended with the invention of AkAbak over 20 years ago. AkAbak isn't the most user friendly s .......
175: High Efficiency Speaker Asylum, RE: Listed as 96db everywhere. (0.00)
Posted by Bill Fitzmaurice on 2022-05-12, 18:49:36 (73.186.230.3)
Google 'gain structure'. The position of a volume control has only a cursory relationship with the power being put out. .......
176: High Efficiency Speaker Asylum, RE: Heretic (0.00)
Posted by Bill Fitzmaurice on 2022-05-11, 13:58:39 (73.186.230.3)
I didn't say it couldn't be good, but as George Augsperger often said there are a hundred ways to make a vented loudspeaker, this is one of them. .......
177: High Efficiency Speaker Asylum, RE: Heretic (0.00)
Posted by Bill Fitzmaurice on 2022-05-11, 12:27:48 (73.186.230.3)
It's a coaxial driver in a bass reflex cab. That's hardly groundbreaking technology. .......
178: High Efficiency Speaker Asylum, RE: New Heretic Speaker Company (0.00)
Posted by Bill Fitzmaurice on 2022-05-09, 12:31:14 (73.186.230.3)
Meh... .......
179: High Efficiency Speaker Asylum, RE: Hoffman's law. (0.00)
Posted by Bill Fitzmaurice on 2022-05-05, 07:53:16 (73.186.230.3)
It's never negotiated, routinely ignored. If it was negotiable it would be called Hoffman's Suggestion. .......
180: High Efficiency Speaker Asylum, RE: Listed as 96db everywhere. (0.00)
Posted by Bill Fitzmaurice on 2022-05-04, 19:39:42 (73.186.230.3)
Model it. In an optimally flat alignment sensitivity is 94.5dB/1w, F3 is 50Hz, and this is a state of the art driver the likes of which didn't exist when the OPs speaker was made. .......
181: High Efficiency Speaker Asylum, RE: Listed as 96db everywhere. (0.00)
Posted by Bill Fitzmaurice on 2022-05-04, 12:45:31 (73.186.230.3)
A twelve inch driver with nominal 96dB/w sensitivity is going to have too low a Qes to deliver that 96dB at 50Hz. .......
182: High Efficiency Speaker Asylum, RE: Listed as 96db everywhere. (0.00)
Posted by Bill Fitzmaurice on 2022-05-04, 10:09:55 (73.186.230.3)
What you posted makes no mention of 1m/1W, only output. With 20 watts 96dB works, because it's not horn loaded, it's a direct radiator. Chances are the places that list it as 1m/1W assumed that was th .......
183: High Efficiency Speaker Asylum, RE: Listed as 96db everywhere. (0.00)
Posted by Bill Fitzmaurice on 2022-05-04, 05:00:53 (73.186.230.3)
That may be, but they're not 96dB/W sensitive. More likely with their rated input of 20W they have 96dB output. That translates to 83dB sensitivity, which is a realistic figure. .......
184: High Efficiency Speaker Asylum, RE: optimistically quoted at 96 dB. (0.00)
Posted by Bill Fitzmaurice on 2022-05-03, 07:06:53 (73.186.230.3)
If they're direct radiators the only way they have 96dB/w sensitivity is if they are weak in the low end. Hoffman's Iron Law isn't negotiable. .......
185: High Efficiency Speaker Asylum, RE: Can I hurt the speakers at low volumes? (0.00)
Posted by Bill Fitzmaurice on 2022-05-02, 04:39:46 (73.186.230.3)
A high sensitivity speaker only needs a few watts, but there's no reason not to use a high power amp, so long as it has a volume control. .......
186: High Efficiency Speaker Asylum, RE: Can I hurt the speakers at low volumes? (0.00)
Posted by Bill Fitzmaurice on 2022-05-01, 19:00:31 (73.186.230.3)
What makes you think that? .......
187: High Efficiency Speaker Asylum, RE: These Audio Centron Speakers just LOOK like they will Kick Ass (0.00)
Posted by Bill Fitzmaurice on 2022-04-29, 09:24:27 (73.186.230.3)
Looks can be deceiving. They were price point speakers, for those who couldn't afford JBL or EV. And like most lower tier PA speakers they were intended to go loud at a low price, with sound quality b .......
188: High Efficiency Speaker Asylum, RE: I would avoid DSP (0.00)
Posted by Bill Fitzmaurice on 2022-04-28, 04:58:30 (73.186.230.3)
You can't. The use of DSP in the studio has been SOP for going on 30 years. If it was the evil that oddiophools make it out to be that wouldn't be the case. As for 'cheap MiniDSP', they have fidelity .......
189: High Efficiency Speaker Asylum, RE: Dont quite understand the design of speakers you are working with (0.00)
Posted by Bill Fitzmaurice on 2022-04-27, 04:55:17 (73.186.230.3)
Phase response does constantly shift throughout the audio spectrum, but you can't hear it. You can only hear the results of phase interactions between two or more sources. This does get a bit tricky, .......
190: High Efficiency Speaker Asylum, RE: Dont quite understand the design of speakers you are working with (0.00)
Posted by Bill Fitzmaurice on 2022-04-26, 19:18:42 (73.186.230.3)
Everything creates phase shift, even plain wire. It's of no consequence, since you can't hear it unless you have two drivers that are at or close to 180 degrees apart, which, BTW, is exactly what resu .......
191: High Efficiency Speaker Asylum, RE: sticks a driver in the box, (0.00)
Posted by Bill Fitzmaurice on 2022-04-26, 05:08:37 (73.186.230.3)
Now that you mention it...the main difference between a $1k speaker and a $10k speaker is $9k. .......
192: High Efficiency Speaker Asylum, RE: Which is better digital eq or notch filter passive x-over? (0.00)
Posted by Bill Fitzmaurice on 2022-04-25, 08:13:36 (73.186.230.3)
IMO those who claim to have Golden Ears have nothing in between them. .......
193: High Efficiency Speaker Asylum, RE: A/B comparison with a true horn system, (0.00)
Posted by Bill Fitzmaurice on 2022-04-18, 04:58:53 (73.186.230.3)
It is a true horn system. The large format HF horn allows a lower than usual crossover from the LF horn, explaining the better midbass. .......
194: High Efficiency Speaker Asylum, RE: opinions: patio outdoor speaker (0.00)
Posted by Bill Fitzmaurice on 2022-04-06, 09:10:49 (73.186.230.3)
It appears OK for outdoor use, but by no means is it high efficiency. .......
195: High Efficiency Speaker Asylum, RE: Klipsch Heritage Considered? (0.00)
Posted by Bill Fitzmaurice on 2022-03-27, 14:55:55 (73.186.230.3)
4 ohms may be tube friendly, depending on the amp output transformer rating, but I'd be going with a much smaller cab if a sub is handling the lows. That also opens up the possibility of something tha .......
196: High Efficiency Speaker Asylum, RE: Klipsch Heritage Considered? (0.00)
Posted by Bill Fitzmaurice on 2022-03-27, 06:03:19 (73.186.230.3)
While the Forte IV sounds good it still can't get around Hoffman's Iron Law. Its 94dB sensitivity is better than average, but still doesn't qualify it for membership in the high efficiency club. ::: T .......
197: High Efficiency Speaker Asylum, RE: Looking for a Friend - Good Looking Speakers for 300b SET Amps ......... (0.00)
Posted by Bill Fitzmaurice on 2022-03-25, 09:42:28 (73.186.230.3)
100dB sensitivity, full range, not too big = Not going to happen. Not even Chuck Norris can break Hoffman's Iron Law. And if it's a direct radiator that claims any higher than 94dB sensitivity it can' .......
198: High Efficiency Speaker Asylum, Is that really you? (0.00)
Posted by Bill Fitzmaurice on 2022-03-14, 12:39:37 (73.186.230.3)
This doesn't sound like you. Was your account hacked? .......
199: High Efficiency Speaker Asylum, JBL Pro quality (0.00)
Posted by Bill Fitzmaurice on 2022-03-06, 06:07:27 (73.186.230.3)
There's nothing wrong with JBL Pro quality. If there was they wouldn't have retained their dominant pro-sound market share. What changed after Harmon took over is that JBL Pro and JBL consumer became .......
200: High Efficiency Speaker Asylum, RE: 26X18X13 room and one would not need DSP. (0.00)
Posted by Bill Fitzmaurice on 2022-02-15, 04:59:34 (73.186.230.3)
Only if it's anechoic. .......
201: High Efficiency Speaker Asylum, RE: Understanding Speaker Sensitivity (0.00)
Posted by Bill Fitzmaurice on 2022-02-14, 18:39:40 (73.186.230.3)
There's a fundamental flaw in that treatise: Speakers are never measured with a 1 watt input. Speakers don't have constant impedance, it's different at every frequency, so power is also different at e .......
202: High Efficiency Speaker Asylum, RE: "...except maybe between midrange and tweeters." (0.00)
Posted by Bill Fitzmaurice on 2022-02-12, 05:58:48 (73.186.230.3)
I use front loaded folded horns up to 1.2kHz with no issues at all, and even to 2kHz for pro-sound, where DSP is SOP. To successfully do so requires that the bends are rounded, as well as having no pa .......
203: High Efficiency Speaker Asylum, RE: Not bad mouthing op amps... (0.00)
Posted by Bill Fitzmaurice on 2022-02-11, 05:08:23 (73.186.230.3)
Google 'MiniDSP'. Test gear isn't necessarily expensive. My primary testing software is HolmImpulse freeware. The only other piece of kit required is a USB test mic, like this: https://www.parts-expre .......
204: High Efficiency Speaker Asylum, RE: "Most people that bad mouth op amps... (0.00)
Posted by Bill Fitzmaurice on 2022-02-10, 18:55:48 (73.186.230.3)
The first stage of amplification is even more important than the mastering, as any issues there will be issues in the final result. One thing you can be assured of with respect to those who whine so m .......
205: High Efficiency Speaker Asylum, RE: "Most people that bad mouth op amps... (0.00)
Posted by Bill Fitzmaurice on 2022-02-10, 13:52:27 (73.186.230.3)
...have never measured them or listened to the good ones that have been implemented well by their designers." They also would have a hard time reconciling their prejudice against op-amps and digital p .......
206: High Efficiency Speaker Asylum, RE: Exactly... (0.00)
Posted by Bill Fitzmaurice on 2022-02-07, 14:51:06 (73.186.230.3)
My hearing is fine. What I haven't lost is my ability to think. Science always works, whether you understand it or not. .......
207: High Efficiency Speaker Asylum, Re: I can't explain it. (0.00)
Posted by Bill Fitzmaurice on 2022-02-07, 10:41:15 (73.186.230.3)
I wouldn't say newer is necessarily any better than older, or that older is necessarily any better than newer. But it's well documented that if you expect that something will be either better or worse .......
208: High Efficiency Speaker Asylum, Re: I can't explain it. (0.00)
Posted by Bill Fitzmaurice on 2022-02-07, 09:23:12 (73.186.230.3)
I can. It's called confirmation bias. .......
209: High Efficiency Speaker Asylum, RE: without op amps full stop? (0.00)
Posted by Bill Fitzmaurice on 2022-02-07, 08:03:01 (73.186.230.3)
If you think DSP and op-amps are a problem consider that what you're listening to is produced with a prodigious amount of both. The same applies to digital music. Analog recording went out before the .......
210: High Efficiency Speaker Asylum, 2225 vs 2226 efficiency (0.00)
Posted by Bill Fitzmaurice on 2022-02-01, 05:12:09 (73.186.230.3)
The 2225H and 2226H response and sensitivity are almost identical. The 2226 sensitivity is slightly better, by about 1dB, which can be seen on a chart but can't be heard. The main difference between t .......
211: High Efficiency Speaker Asylum, RE: Square Trade theater tear-outs (0.00)
Posted by Bill Fitzmaurice on 2022-01-30, 13:13:00 (73.186.230.3)
A system that large that still needs subs for home theater isn't all that practical. They still need subs for theatrical installations as well, which explains why they're being retired from that servi .......
212: High Efficiency Speaker Asylum, RE: Altec Valencia sensitivity Q (0.00)
Posted by Bill Fitzmaurice on 2022-01-28, 13:42:15 (73.186.230.3)
Altec specs were pretty honest. The 416-8B woofer models at 97dB with an F3 of 40Hz in an 11 cu ft VB with 25Hz tuning. Spec fudging was rare back when the Valencia was produced, because back then th .......
213: High Efficiency Speaker Asylum, RE: A7 Impedance sweep (0.00)
Posted by Bill Fitzmaurice on 2022-01-12, 19:55:36 (73.186.230.3)
You can get a reasonably accurate predicted Z plot in HornResp for the woofer, but not for the full speaker. To do that you'd need the plot for the woofer, the plot for the HF driver/horn, then you'd .......
214: High Efficiency Speaker Asylum, RE: SICA 15 S 3 PL looks best (0.00)
Posted by Bill Fitzmaurice on 2022-01-11, 13:59:12 (73.186.230.3)
I'd say 18Sound 15W700, BMS 15S330, FaitalPRO 15FX560,15FH500, 15FH530, B&C 15PZB100, Beyma 15WR400 just to name a few are all as good as or better than the SICA. .......
215: High Efficiency Speaker Asylum, RE: TAD TL-1601B Measurements (0.00)
Posted by Bill Fitzmaurice on 2022-01-11, 08:03:00 (73.186.230.3)
The program allows you to limit the size range. I came up with 33 fifteen inch drivers. 35-900 isn't at all difficult to realize. .......
216: High Efficiency Speaker Asylum, RE: TAD TL-1601B Measurements (0.00)
Posted by Bill Fitzmaurice on 2022-01-11, 06:47:46 (73.186.230.3)
There are many woofers that equal or better the TL-1601B specs. Use this to find them. .......
217: High Efficiency Speaker Asylum, RE:superiority of 2inch drivers (0.00)
Posted by Bill Fitzmaurice on 2022-01-11, 04:59:10 (73.186.230.3)
2" drivers by and large have lower Fs and higher Vd than smaller diaphragms, so they tend to work better to lower frequencies. As always there's no such thing as a free lunch. What's given up in this .......
218: High Efficiency Speaker Asylum, RE: -3db @18 Hz?. Doesn't horn physics get in the way here? NO (0.00)
Posted by Bill Fitzmaurice on 2022-01-08, 05:52:44 (73.186.230.3)
DSP isn't exactly a secret, it's been SOP in pro-sound since the EAW KF850. The physics dictate that at 18Hz, and likely to 30Hz, this box is operating as a bass reflex, with sensitivity well below wh .......
219: High Efficiency Speaker Asylum, RE: Are the majority of efficient speakers horn loaded (0.00)
Posted by Bill Fitzmaurice on 2021-12-14, 05:17:15 (73.186.230.3)
If you want high sensitivity with good low frequency extension the only way to get it is with either horn loading or a lot of drivers. My sub is horn loaded. It's big, but because subs can be placed w .......
220: High Efficiency Speaker Asylum, RE: Sensitivity / Efficiency and Sound quality Q (0.00)
Posted by Bill Fitzmaurice on 2021-12-13, 17:34:08 (73.186.230.3)
High sensitivity tends to have lower distortion, especially when high sensitivity is achieved with horn loading. This deals specifically with modulation distortion, but harmonic distortion is also gre .......
221: High Efficiency Speaker Asylum, RE: I don't want or care about 18Hz (0.00)
Posted by Bill Fitzmaurice on 2021-11-30, 19:08:15 (73.186.230.3)
If you're getting out of the LaScalas what they're capable of no direct radiator sub will keep up, unless it's so large that it might as well be a horn. .......
222: High Efficiency Speaker Asylum, RE: I don't want or care about 18Hz (0.00)
Posted by Bill Fitzmaurice on 2021-11-30, 12:28:08 (73.186.230.3)
IMO if you don't extend response by an octave subs aren't worth having, and if you've got high sensitivity mains you need high sensitivity subs, which brings us back to horn loaded. It's not that I'm .......
223: High Efficiency Speaker Asylum, RE: I don't want or care about 18Hz (0.00)
Posted by Bill Fitzmaurice on 2021-11-29, 11:06:52 (73.186.230.3)
I like the 25Hz I get out of my horn, when it's there, which is seldom. Movie directors went LFE crazy after it became widely available, but they've backed off on the really low stuff since realizing .......
224: High Efficiency Speaker Asylum, RE: review, but not from PWK (0.00)
Posted by Bill Fitzmaurice on 2021-11-29, 05:08:08 (73.186.230.3)
The only way PWK could review it is through a psychic. If he did he'd be totally honest about it, including if DSP was involved. Bose,OTOH...back when there were dedicated Bose listening rooms set up .......
225: High Efficiency Speaker Asylum, RE: looks like Roy Delgado read your article (0.00)
Posted by Bill Fitzmaurice on 2021-11-29, 05:01:33 (73.186.230.3)
Or he didn't read it and went back over ground already trodden. I've found that the main benefit to venting the rear chamber into the horn throat is a reduction in chuffing of the port output, in the .......
226: High Efficiency Speaker Asylum, RE: -3db @18 Hz?. Doesn't horn physics get in the way here? NT (0.00)
Posted by Bill Fitzmaurice on 2021-11-28, 09:25:00 (73.186.230.3)
I wrote about that configuration in a 50Hz horn, but never used it for sub bass horns. In that application I found that a sealed rear chamber works just as well, so the added complexity of venting the .......
227: High Efficiency Speaker Asylum, RE: How do you deal with noisy mains and high sensitivity system? (0.00)
Posted by Bill Fitzmaurice on 2021-11-22, 04:57:03 (73.186.230.3)
Look at causes other than the power. The best method of 'power conditioning' is to transformer isolate the device from the AC line, rectify the isolated AC to DC, filter the ripple from the DC and the .......
228: High Efficiency Speaker Asylum, RE: Has anyone tried the Decware DFR-8 Full Range driver ? (0.00)
Posted by Bill Fitzmaurice on 2021-11-12, 08:26:26 (73.186.230.3)
Just as with any speaker enclosure you can't pop in any random driver, you must software model the enclosure with the intended driver to see if it's compatible. In this case you'd use HornResp for mod .......
229: High Efficiency Speaker Asylum, IMHO your in the personal taste dept and suggestions are just that, suggestions. (0.00)
Posted by Bill Fitzmaurice on 2021-11-11, 10:35:43 (73.186.230.3)
Agreed, Dave. Uber priced caps aren't as silly as uber priced wire, but they're a close second. .......
230: High Efficiency Speaker Asylum, RE: SAP Quartette impedence? (0.00)
Posted by Bill Fitzmaurice on 2021-11-01, 04:55:46 (73.186.230.3)
If by lower part you mean the lower frequency range that's where current demand is highest, so that's where being sure the load impedance isn't too low for the amp capacity is critical. .......
231: High Efficiency Speaker Asylum, RE: SAP Quartette impedence? (0.00)
Posted by Bill Fitzmaurice on 2021-10-31, 10:10:56 (73.186.230.3)
That's possible. Bizarre, but possible. However, before making any assumptions I'd do an impedance sweep to be sure. .......
232: High Efficiency Speaker Asylum, RE: SAP Quartette impedence? (0.00)
Posted by Bill Fitzmaurice on 2021-10-30, 19:04:31 (73.186.230.3)
3.7 ohms DCR would be a nominal 4 ohm impedance. .......
233: High Efficiency Speaker Asylum, RE: SAP Quartette impedence? (0.00)
Posted by Bill Fitzmaurice on 2021-10-30, 05:06:45 (73.186.230.3)
Measure it with a DMM. DCR will read in the vicinity of 0.7 x Z. .......
234: High Efficiency Speaker Asylum, RE: JBL 2446 (0.00)
Posted by Bill Fitzmaurice on 2021-10-29, 08:18:02 (73.186.230.3)
It depends on the horn used with it. If the horn throat constricts that opening it's a front chamber, if not it's part of the throat. .......
235: High Efficiency Speaker Asylum, RE: If it's were 12 feet long, it would NOT need EQ Boost. (0.00)
Posted by Bill Fitzmaurice on 2021-10-26, 08:43:27 (73.186.230.3)
You can trade off broadband sensitivity to get flatter response to lower frequencies. I do that with my Table Tuba and Tuba HT designs. I don't with my pro-sound subs, where extension is secondary to .......
236: High Efficiency Speaker Asylum, RE: If it's were 12 feet long, it would NOT need EQ Boost. (0.00)
Posted by Bill Fitzmaurice on 2021-10-25, 19:32:43 (73.186.230.3)
Not necessarily. To have flat or even close to flat response to the Fc as defined by the path length requires sufficient mouth area. .......
237: High Efficiency Speaker Asylum, RE: I don't have a Sine Wave Generator (0.00)
Posted by Bill Fitzmaurice on 2021-10-21, 08:05:35 (73.186.230.3)
You can download a sine wave generator as a standalone or as part of a program as a computer program or app, many are available as freeware. But where doing an RTA is concerned you want pink noise any .......
238: High Efficiency Speaker Asylum, RE: Too Much Choice? (0.00)
Posted by Bill Fitzmaurice on 2021-10-21, 04:53:56 (73.186.230.3)
It may be too much if you don't understand the advantages and disadvantages to the various options. One would hope that if someone was going to spend more on speakers than most people do on their cars .......
239: High Efficiency Speaker Asylum, RE: What Is The Easiest Way To Measure It ? (0.00)
Posted by Bill Fitzmaurice on 2021-10-19, 13:00:34 (73.186.230.3)
Which iPhone? Aren't they up to #12? I guarantee they don't all have the same mic or frequency response. .......
240: High Efficiency Speaker Asylum, RE: What Is The Easiest Way To Measure It ? (0.00)
Posted by Bill Fitzmaurice on 2021-10-19, 10:43:13 (73.186.230.3)
Any analyzer not calibrated for a specific phone model won't work. .......
241: High Efficiency Speaker Asylum, RE: Questions About Bi Amping With Electronic Crossover (0.00)
Posted by Bill Fitzmaurice on 2021-10-18, 11:12:46 (73.186.230.3)
Whoever told you that should be ignored in the future. Active and passive crossovers are inherently different. For instance, actives don't use inductors, so what applies to the one doesn't necessaril .......
242: High Efficiency Speaker Asylum, RE: Questions About Bi Amping With Electronic Crossover (0.00)
Posted by Bill Fitzmaurice on 2021-10-18, 08:02:50 (73.186.230.3)
The summed response of filters at the crossover frequency is determined by the filter Q, not the filter slope. There can be a major dip at the crossover frequency with 2nd order/2nd order passives, as .......
243: High Efficiency Speaker Asylum, RE: bill fitzmaurice web site? (0.00)
Posted by Bill Fitzmaurice on 2021-10-11, 04:48:58 (73.186.230.3)
Why? If you go to billfitzmaurice.com, .net or .info you'll end up in the same place. .......
244: High Efficiency Speaker Asylum, RE: bill fitzmaurice web site? (0.00)
Posted by Bill Fitzmaurice on 2021-10-07, 12:00:57 (73.186.230.3)
It does that because all traffic to the .com and .net addresses is redirected to the .info address. .......
245: High Efficiency Speaker Asylum, RE: bill fitzmaurice web site? (0.00)
Posted by Bill Fitzmaurice on 2021-10-07, 10:00:36 (73.186.230.3)
It's at the same www.billfitzmaurice.com address it's been at for the last seventeen years. You can go there, or billfitzmaurice.net, or direct to billfitzmaurice.info. .......
246: High Efficiency Speaker Asylum, RE: What Kind Of Enclosure Is This ? (0.00)
Posted by Bill Fitzmaurice on 2021-09-28, 10:20:35 (73.186.230.3)
They're not 114dB/w sensitive. Scoops have broadband sensitivity the same as the driver has in a direct radiating alignment. The horn boosts sensitivity in the lows only, usually to no more than that .......
247: High Efficiency Speaker Asylum, RE: What Kind Of Enclosure Is This ? (0.00)
Posted by Bill Fitzmaurice on 2021-09-28, 10:08:21 (73.186.230.3)
It's probably a scoop. They were popular when drivers lacked the xmax to go really loud at low frequencies. They suffered from the fatal flaw of the front and rear wave meeting 180 degrees apart, caus .......
248: High Efficiency Speaker Asylum, RE: Very unfortunate we can't still ask Terry. (0.00)
Posted by Bill Fitzmaurice on 2021-09-25, 08:40:33 (73.186.230.3)
There's no need to ask Terry, it's a very easy process to reverse engineer the design using the right speaker modeling sofetware, like HornResp. All one needs is the full set of cab dimensions, and th .......
249: High Efficiency Speaker Asylum, RE: Altec Lansing 417-8H (0.00)
Posted by Bill Fitzmaurice on 2021-09-24, 05:02:30 (73.186.230.3)
It's maximally flat in 3 cu ft with a 32Hz Fb, but f3 is only 80Hz. That's not unusual for drivers of that vintage. The D130 was no better. 6 cu ft with a 40Hz Fb works reasonably well. 20 cu ft is na .......
250: High Efficiency Speaker Asylum, RE: I would simply buy an Air wound Coil. (0.00)
Posted by Bill Fitzmaurice on 2021-09-23, 19:00:02 (73.186.230.3)
Air core isn't obvious to me. I only use them with values so small that solid core isn't an option. .......
251: High Efficiency Speaker Asylum, RE: Altec Lansing 417-8H (0.00)
Posted by Bill Fitzmaurice on 2021-09-23, 09:01:49 (73.186.230.3)
I used 417-8H as well, in my bass cabs and in the JBL4560 inspired horn loaded PA cabs I designed and built in 1969. With their long xmax the 417s didn't have the compressed sweetness that Greenbacks .......
252: High Efficiency Speaker Asylum, RE: Altec Lansing 421A (0.00)
Posted by Bill Fitzmaurice on 2021-09-23, 07:28:33 (73.186.230.3)
I'm well aware of the 421A, I bought one in 1970. It was not an electric guitar speaker. The Jensen P8R that's the subject here is. That's why it's been used by Fender since the 1960s. Don't believe m .......
253: High Efficiency Speaker Asylum, RE: I would simply buy an Air wound Coil. (0.00)
Posted by Bill Fitzmaurice on 2021-09-23, 07:03:34 (73.186.230.3)
Saturation tends to be a non-issue. When it does happen it's usually because the coil wire gauge is too small, which not only leads to saturation but also high DCR. I size my inductors appropriately, .......
254: High Efficiency Speaker Asylum, RE: Altec Lansing 421A (0.00)
Posted by Bill Fitzmaurice on 2021-09-23, 05:06:01 (73.186.230.3)
Altec never made a driver for electric guitar. Drivers used in VOT, like the 418-8H, were often used for electric bass, but the specs for electric bass and electric guitar are totally different. The J .......
255: High Efficiency Speaker Asylum, RE: Jensen P8R ìn Karlsen 12 (0.00)
Posted by Bill Fitzmaurice on 2021-09-22, 12:54:51 (73.186.230.3)
Loaded in a Karlson or any other box I don't see this musical instrument driver being much good for anything other than musical instruments, specifically electric guitar. .......
256: High Efficiency Speaker Asylum, RE: Substituting Lowther driver (0.00)
Posted by Bill Fitzmaurice on 2021-09-20, 04:47:50 (73.186.230.3)
Do not go just by the sensitivity rating. Higher sensitivity is accompanied by reduced low frequency response. You have to look at the low frequency SPL charts for each as measured in the cabinet or c .......
257: High Efficiency Speaker Asylum, RE: I would simply buy an Air wound Coil. (0.00)
Posted by Bill Fitzmaurice on 2021-09-19, 08:40:04 (73.186.230.3)
I don't run simulations, I measure my coils. High DCR coils and the high insertion losses they result in aren't conducive to high sensitivity. Using a high DCR coil to balance out response is voodoo e .......
258: High Efficiency Speaker Asylum, RE: one of the biggest leaps in bass horn tech (0.00)
Posted by Bill Fitzmaurice on 2021-09-06, 08:46:05 (73.186.230.3)
Get back to us when you have a measured SPL chart. Without actual numbers all that remains is advertising. .......
259: High Efficiency Speaker Asylum, RE: one of the biggest leaps in bass horn tech - another patent (0.00)
Posted by Bill Fitzmaurice on 2021-09-03, 09:31:36 (73.186.230.3)
That's very similar to the Novak design, the main difference being that the ports vent into the horn further down instead of at the throat. It operates on the same principle, that a tapered pipe works .......
260: High Efficiency Speaker Asylum, RE: one of the biggest leaps in bass horn tech (0.00)
Posted by Bill Fitzmaurice on 2021-09-02, 19:21:38 (73.186.230.3)
As noted in a post below it's not new technology. It was patented by James Novak in 1959. how 'staggering' the performance is remains to be seen if and when Klipsch publishes SPL charts. .......
261: High Efficiency Speaker Asylum, RE: anyone here got a ballpark hornresp approximation of the new Jubilee ? (0.00)
Posted by Bill Fitzmaurice on 2021-09-02, 04:50:24 (73.186.230.3)
The Snail was a design literally from the last century, I haven't looked at it for close to 20 years and don't remember what I did, only that I came up with something better. My Jack series speakers l .......
262: High Efficiency Speaker Asylum, RE: anyone here got a ballpark hornresp approximation of the new Jubilee ? (0.00)
Posted by Bill Fitzmaurice on 2021-09-01, 19:32:08 (73.186.230.3)
There's not enough detail in the patent to know the dimensions, driver and so forth, but the concept is simple enough, that a tapered pipe works as a horn to one frequency and as a bass reflex ducted .......
263: High Efficiency Speaker Asylum, RE: anyone here got a ballpark hornresp approximation of the new Jubilee ? (0.00)
Posted by Bill Fitzmaurice on 2021-09-01, 11:16:16 (73.186.230.3)
Novak did patent it in the '50s. His art was for a midbass horn. Note the folded version, which shows frequency response of the horn, of the bass reflex, and of the two together. As I said before the .......
264: High Efficiency Speaker Asylum, RE: anyone here got a ballpark hornresp approximation of the new Jubilee ? (0.00)
Posted by Bill Fitzmaurice on 2021-09-01, 08:16:21 (73.186.230.3)
I can't tell from the picture exactly what the configuration is. However, I know from experience that venting a rear chamber into the throat with a bass horn doesn't work very well. Ive tried it, and .......
265: High Efficiency Speaker Asylum, RE: ZU (0.00)
Posted by Bill Fitzmaurice on 2021-08-27, 09:07:40 (73.186.230.3)
The KLH would certainly go lower, but at the expense of sensitivity. No one gets around Hoffman's (the H in KLH) Iron Law. .......
266: High Efficiency Speaker Asylum, RE: ZU you could make your own version but it woujld not have any resale value (0.00)
Posted by Bill Fitzmaurice on 2021-08-26, 06:10:53 (73.186.230.3)
Quite right, Fred. It's not exactly state of the art. The phase plug isn't a phase plug, it's a pole piece extension. Removing the dust cap allows a simpler crossover by reducing the high frequency ex .......
267: High Efficiency Speaker Asylum, RE: ZU (0.00)
Posted by Bill Fitzmaurice on 2021-08-24, 04:39:42 (73.186.230.3)
It's modified in that a pole piece extension was added. It looks cool, but has no effect. Their claimed sensitivity is at 1 watt, and since it's a 12 ohm speaker that's 3.46 volts. I don't see that as .......
268: High Efficiency Speaker Asylum, RE: ZU (0.00)
Posted by Bill Fitzmaurice on 2021-08-23, 19:50:54 (73.186.230.3)
Agreed. They use a modified Eminence B102 woofer, which has 94dB sensitivity and a 50Hz F3. It does reach 35Hz as Zu claims, but at -12dB. .......
269: High Efficiency Speaker Asylum, RE: Community M200 (0.00)
Posted by Bill Fitzmaurice on 2021-08-17, 10:32:59 (73.186.230.3)
The notch is probably due to the lack of a phase plug. Since it was intended to be used as a midrange driver Community probably didn't see the need to use one. .......
270: High Efficiency Speaker Asylum, RE: Esimating directivity effects in midbasshorn w. hornresp ? (0.00)
Posted by Bill Fitzmaurice on 2021-08-10, 19:26:28 (73.186.230.3)
The flare is inadequate. When the throat is larger than the cone there's no loading. By dint of working as a waveguide there will be some gain in the midbass, but none above that, where it will act as .......
271: High Efficiency Speaker Asylum, RE: Esimating directivity effects in midbasshorn w. hornresp ? (0.00)
Posted by Bill Fitzmaurice on 2021-08-10, 13:20:17 (73.186.230.3)
You can only get directivity in HornResp with a single segment horn and square mouth. I don't make any single segment horns with square mouths, so I've never compared a predicted versus measured resul .......
272: High Efficiency Speaker Asylum, RE: Re-thinking the building of a 350Hz tractrix horn (0.00)
Posted by Bill Fitzmaurice on 2021-08-07, 09:16:29 (73.186.230.3)
Other issues aside the 350-800Hz range should be avoided for crossing over, as that's where time and phase issues are most easily heard. .......
273: High Efficiency Speaker Asylum, RE: Hit or Miss (0.00)
Posted by Bill Fitzmaurice on 2021-08-06, 19:41:13 (73.186.230.3)
A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't. .......
274: High Efficiency Speaker Asylum, re: modern 8 inch drivers = T18 headbanger cornerhorn (0.00)
Posted by Bill Fitzmaurice on 2021-08-06, 05:45:58 (73.186.230.3)
Yeah, but rather than four T18 I'd have two Table Tuba. .......
275: High Efficiency Speaker Asylum, RE: Nostalgia is not a friend of better Audio performance, yet it persists. (0.00)
Posted by Bill Fitzmaurice on 2021-08-05, 15:04:40 (73.186.230.3)
A compression driver/horn is capable of far lower THD than a direct radiator, just as a horn loaded woofer or sub is capable of far lower THD than a direct radiator. But you don't need to use vintage .......
276: High Efficiency Speaker Asylum, Nostalgia is not a friend of better Audio performance, yet it persists. (0.00)
Posted by Bill Fitzmaurice on 2021-08-05, 05:39:48 (73.186.230.3)
Absolutely. A '55 Chevy is nice to look at, and a must for collectors. I wouldn't want one as a daily driver. .......
277: High Efficiency Speaker Asylum, RE: The 1972 JM-3 system (0.00)
Posted by Bill Fitzmaurice on 2021-08-04, 08:17:00 (73.186.230.3)
Too bad Meyer wasn't aware of the comb filtering that resulted from the side by side placement of the T350s, which was made worse by splaying them outward. Using clusters of boxes splayed outward exte .......
278: High Efficiency Speaker Asylum, RE: I take it that there is no Kappa 15C @ 8 ohms?. 2220 ran outta steam (0.00)
Posted by Bill Fitzmaurice on 2021-08-04, 07:55:33 (73.186.230.3)
The original D130 xmax was only 0.76mm, resulting in Vd of 65cc. That's why they used fifteens as midbasses back in the day. A typical modern day eight has a Vd of 100cc. .......
279: High Efficiency Speaker Asylum, RE: I take it that there is no Kappa 15C @ 8 ohms?. (0.00)
Posted by Bill Fitzmaurice on 2021-08-04, 04:50:40 (73.186.230.3)
The most telling spec is xmax. At 4mm the A version can take more than three times the power than the C version before running out of mechanical headroom. In a horn loaded enclosure used in the home t .......
280: High Efficiency Speaker Asylum, RE: I take it that there is no Kappa 15C @ 8 ohms?. (0.00)
Posted by Bill Fitzmaurice on 2021-08-03, 14:54:23 (73.186.230.3)
Never use a resistor. They're OK in tweeter and midrange applications, but not with woofers. When there's more than one impedance version Eminence labels 4 ohms as C, 8 ohms as A and 16 ohms as B. :: .......
281: High Efficiency Speaker Asylum, RE: OK... (0.00)
Posted by Bill Fitzmaurice on 2021-08-03, 10:31:43 (73.186.230.3)
I've always considered the term 'reactance annulling' as a three dollar word applied to a ten cent concept. As to what it is, when the combination of the driver Mms and the horn Mms result in the driv .......
282: High Efficiency Speaker Asylum, RE: OK... (0.00)
Posted by Bill Fitzmaurice on 2021-08-02, 12:54:21 (73.186.230.3)
"a folded horn (to minimize cabinet depth) which can reach 70Hz or a bit lower 2pi at greater than DR levels, "sound good" and somehow not be too big." That's not a very high bar to clear. My Small Ta .......
283: High Efficiency Speaker Asylum, RE: OK... (0.00)
Posted by Bill Fitzmaurice on 2021-08-02, 09:31:54 (73.186.230.3)
I recall lots of discussion about how to calculate the rear chamber volume and how it related to reactance annulling before HornResp did all the heavy lifting. The chamber size was usually too big bec .......
284: High Efficiency Speaker Asylum, RE: OK... (0.00)
Posted by Bill Fitzmaurice on 2021-08-01, 19:33:59 (73.186.230.3)
They act as manifolds, and they act as reflective boundaries. With no reflector when the distance from bend to bend is 1/4 wavelength you'll get a cancellation, as the reflected wave back into the hor .......
285: High Efficiency Speaker Asylum, RE: OK... (0.00)
Posted by Bill Fitzmaurice on 2021-08-01, 10:34:43 (73.186.230.3)
'Olson was well aware of the significance of the chambers created in the folding of a horn. He pictured the volume of these chambers, as well as the area of the aperture feeding into the next section, .......
286: High Efficiency Speaker Asylum, RE: OK... (0.00)
Posted by Bill Fitzmaurice on 2021-07-31, 14:47:17 (73.186.230.3)
HornResp can model the throat size for maximum sensitivity or maximum band width or anything in between. As for the Klipsch rubber throat, he was following Olson's example of using a short rapid flare .......
287: High Efficiency Speaker Asylum, RE: So I'm a fooking idiot... (0.00)
Posted by Bill Fitzmaurice on 2021-07-31, 06:29:10 (73.186.230.3)
I can't see using an EVM 15-L for a bass horn. The 'L' stands for lead, as in lead guitar, as opposed to 'B' for bass guitar. It's not about the high frequency response of the two, it's about the lows .......
288: High Efficiency Speaker Asylum, RE: Ah, must be the same for the k120... (0.00)
Posted by Bill Fitzmaurice on 2021-07-30, 14:32:49 (73.186.230.3)
Once again, there is no set amount of gain you get from horn loading. It depends on the driver specs and the horn specs. The average is between 6 and 10 dB. You also can't assume that the listed drive .......
289: High Efficiency Speaker Asylum, RE: Sorry Claud... (0.00)
Posted by Bill Fitzmaurice on 2021-07-30, 13:01:19 (73.186.230.3)
Horn loading doesn't always add 10dB, that depends on the driver specs and horn configuration. Model a 2220 in HornResp and you'll see it's capable of 107dB when horn loaded. .......
290: High Efficiency Speaker Asylum, RE: Sorry Claud... (0.00)
Posted by Bill Fitzmaurice on 2021-07-30, 10:27:27 (73.186.230.3)
"Maybe I would give your posts more cred. if you would stop claiming that a horn loaded 98.1 dB 15 in. cone driver suddenly becomes 108dB" If you aren't aware that horn loading a 98.1dB 15 inch cone d .......
291: High Efficiency Speaker Asylum, RE: I would simply buy an Air wound Coil. (0.00)
Posted by Bill Fitzmaurice on 2021-07-28, 09:22:49 (73.186.230.3)
An affordable 7mH air core coil is only 18 gauge, giving a 1.6 ohm DCR. That's totally unsuited for a crossover. A 15 gauge 7mH air core coil has 1 ohm DCR, which is marginal with an 8 ohm load, way t .......
292: High Efficiency Speaker Asylum, RE: Damage on Iron Core of Inductor... (0.00)
Posted by Bill Fitzmaurice on 2021-07-26, 12:52:28 (73.186.230.3)
The crack doesn't affect the mass of the coil, so it won't change its value. Id put a bead of silicone sealant on it to insure it won't get worse. Where DCR is concerned I always keep it at 5% or less .......
293: High Efficiency Speaker Asylum, RE: did the craze of bullet phase nlugs & tweeters kill off the slot loaded tweeter? (0.00)
Posted by Bill Fitzmaurice on 2021-07-19, 20:01:52 (73.186.230.3)
If anything I'd say what killed it off is people buying with their eyes. The slot tweeter is a variation of the classic diffraction horn, and like the diffraction horn the uninformed masses don't unde .......
294: High Efficiency Speaker Asylum, RE: Super Heresy 1.0 (0.00)
Posted by Bill Fitzmaurice on 2021-06-25, 19:26:28 (73.186.230.3)
No worries, thanks. .......
295: High Efficiency Speaker Asylum, RE: 4ohm (or lower) usually works best with SS.. (0.00)
Posted by Bill Fitzmaurice on 2021-06-25, 05:01:59 (73.186.230.3)
I'm afraid you've got that backwards. SS amps have a minimum impedance load, tube amps have a maximum impedance load. You should not use SS with a load lower than the minimum load rating for the amp, .......
296: High Efficiency Speaker Asylum, RE: Super Heresy 1.0 (0.00)
Posted by Bill Fitzmaurice on 2021-06-24, 19:00:49 (73.186.230.3)
I appreciate the invite, but I'm not in need of new speakers, and of course if I was I'd design it. .......
297: High Efficiency Speaker Asylum, RE: jump to Klipsch (0.00)
Posted by Bill Fitzmaurice on 2021-06-24, 04:54:12 (73.186.230.3)
Unless it's a Heritage model, like a Cornwall or LaScala, even a Heresy, a jump to Klipsch doesn't mean an increase in sensitivity over any other brand using the same size driver in the same size encl .......
298: High Efficiency Speaker Asylum, RE: High Sensitivity Bookshelf Speakers sub £300? (0.00)
Posted by Bill Fitzmaurice on 2021-06-23, 14:45:51 (73.186.230.3)
Google 'Hoffman's Iron Law'. To summarize it states that where sensitivity, small size and low frequency extension is concerned you may have two of those factors, any two, but you can't have all three .......
299: High Efficiency Speaker Asylum, RE: Upcoming PA system project! Help needed (0.00)
Posted by Bill Fitzmaurice on 2021-06-12, 15:28:31 (73.186.230.3)
You can ask on my forum owners/builders of my gear what might work for you within your budget. Some are located in Belgium. However, be forewarned that renters seldom know what they're doing, and even .......
300: High Efficiency Speaker Asylum, RE: Reviewers either don't know or don't care (0.00)
Posted by Bill Fitzmaurice on 2021-06-10, 08:42:48 (73.186.230.3)
What's more significant than the output, which must be analog, is the input. If that's digital, and the amp is digital, and the source is digital, it keeps the signal in the digital domain until it ge .......
301: High Efficiency Speaker Asylum, RE: Reviewers either don't know or don't care (0.00)
Posted by Bill Fitzmaurice on 2021-06-10, 05:06:59 (73.186.230.3)
IME it's usually that they don't know. .......
302: High Efficiency Speaker Asylum, RE: Proper arrangement of drivers (0.00)
Posted by Bill Fitzmaurice on 2021-05-27, 19:37:35 (73.186.230.3)
You didn't say they were horns. The CTC spacing requirement applies to direct radiating drivers. In the case of horns they should be placed as tight as possible, vertically stacked, the exception bein .......
303: High Efficiency Speaker Asylum, RE: Proper arrangement of drivers (0.00)
Posted by Bill Fitzmaurice on 2021-05-25, 08:20:16 (73.186.230.3)
The center to center distance between drivers should be no more than one wavelength at the frequency where they crossover to each other. That makes it impractical to place them in separate boxes. ::: .......
304: High Efficiency Speaker Asylum, RE: And the Group Delay (0.00)
Posted by Bill Fitzmaurice on 2021-05-22, 07:23:43 (73.186.230.3)
I've never heard group delay. IME if a speaker has enough group delay to be heard it's so flawed in other respects as to be unlistenable. That includes extreme examples, like this: .......
305: High Efficiency Speaker Asylum, RE: Mid-bass Hornresp (V51.30) simulations (0.00)
Posted by Bill Fitzmaurice on 2021-05-19, 14:31:32 (73.186.230.3)
The results are exactly what one should expect. The longer path and larger mouth of the second extends response a little lower, while the smaller mouth extends response a little higher. .......
306: High Efficiency Speaker Asylum, RE: edgar article on reactance annuling (0.00)
Posted by Bill Fitzmaurice on 2021-05-17, 19:14:59 (73.186.230.3)
Reactance annulling is a three dollar word that describes a simple process. When the air mass of the horn is added to the driver Mms the operational driver resonance is pushed lower than the driver Fs .......
307: High Efficiency Speaker Asylum, RE: That's quite a frequency plot and specs for the Hyperion... (0.00)
Posted by Bill Fitzmaurice on 2021-05-17, 09:06:04 (73.186.230.3)
My assumption is that's with the on-board DSP correction engaged. Not that there's anything wrong with that, I can't imagine not using DSP, but it won't be a hit with the minimalists. .......
308: High Efficiency Speaker Asylum, RE: The Spatial Audio X3 OB speaker is 97 db efficient (0.00)
Posted by Bill Fitzmaurice on 2021-04-30, 11:21:26 (73.186.230.3)
At what frequency? 1kHz, sure. 50Hz, no way. It's easy to claim 97dB sensitivity, but the proof lies in the measured SPL charts. .......
309: High Efficiency Speaker Asylum, RE: Lii Silver 10 Reference Speakers (0.00)
Posted by Bill Fitzmaurice on 2021-04-30, 09:28:04 (73.186.230.3)
You can have big bass with OB, provided you have sufficient driver displacement, power and EQ. High sensitivity is a different story. With high sensitivity you don't need massive driver displacement, .......
310: High Efficiency Speaker Asylum, RE: thank you! (0.00)
Posted by Bill Fitzmaurice on 2021-04-26, 07:02:03 (73.186.230.3)
You're welcome. It's useful to note that indoors reflections off the walls and ceiling alter the result, as they do with all speakers, and it's possible to get passable bass with the combination of pl .......
311: High Efficiency Speaker Asylum, RE: "drop like a stone"... (0.00)
Posted by Bill Fitzmaurice on 2021-04-25, 19:36:11 (73.186.230.3)
A 32 inch wavelength is 420Hz. Cancellation is moderate until the distance from the rear of the cone to the front of the cone is one wavelength. In this case perhaps 250Hz is where severe cancellation .......
312: High Efficiency Speaker Asylum, RE: And yet you generalize. (0.00)
Posted by Bill Fitzmaurice on 2021-04-25, 14:54:39 (73.186.230.3)
You asked about having a high sensitivity speaker that was small. That's only possible if it lacks low end. Search 'Hoffman's Iron Law'. You asked about a high sensitivity OB. The front and rear waves .......
313: High Efficiency Speaker Asylum, RE: "drop like a stone"... (0.00)
Posted by Bill Fitzmaurice on 2021-04-25, 14:49:16 (73.186.230.3)
In this case it's the result of the front and rear waves cancelling each other, with the scientific terminology being 'destructive interference'. .......
314: High Efficiency Speaker Asylum, RE: And yet you generalize. (0.00)
Posted by Bill Fitzmaurice on 2021-04-25, 12:49:45 (73.186.230.3)
What would I expect? For the response to drop like a stone below the frequency where the baffle is one wavelength across. I'll leave the math up to you. It's not going to even vaguely resemble the res .......
315: High Efficiency Speaker Asylum, RE: Lii Silver 10 Reference Speakers (0.00)
Posted by Bill Fitzmaurice on 2021-04-25, 11:29:54 (73.186.230.3)
My experience is limited to being a professional loudspeaker designer for the last forty years. ;) .......
316: High Efficiency Speaker Asylum, RE: Lii Silver 10 Reference Speakers (0.00)
Posted by Bill Fitzmaurice on 2021-04-25, 08:58:01 (73.186.230.3)
High sensitivity speakers aren't small, and open baffle speakers aren't high sensitivity. .......
317: High Efficiency Speaker Asylum, RE: E V (0.00)
Posted by Bill Fitzmaurice on 2021-04-25, 08:52:40 (73.186.230.3)
That doesn't look like a cover, that looks like the motor. It's an odd arrangement, if that's the motor the T35 must be mounted from the front somehow. .......
318: High Efficiency Speaker Asylum, RE: E V (0.00)
Posted by Bill Fitzmaurice on 2021-04-24, 19:48:42 (73.186.230.3)
They may have a label glued to the center of the covers. If you pry them off there's a screw beneath to remove the cover. .......
319: High Efficiency Speaker Asylum, RE: Jensen / Rola field coil drivers (0.00)
Posted by Bill Fitzmaurice on 2021-04-20, 10:32:41 (73.186.230.3)
BMW's planned obsolescence cycle is no worse than many and better than most. Even being an owner I have to look twice to tell if it's an E series from 2004, an F from 2013 or a G from 2021. The curren .......
320: High Efficiency Speaker Asylum, RE: Jensen / Rola field coil drivers (0.00)
Posted by Bill Fitzmaurice on 2021-04-20, 08:07:28 (73.186.230.3)
I don't have any personal experience driving a 1929 Ford Model A either, but nonetheless I'm quite sure I wouldn't want one other than perhaps as a collectors item. It sure wouldn't replace my BMW as .......
321: High Efficiency Speaker Asylum, RE: Jensen / Rola field coil drivers (0.00)
Posted by Bill Fitzmaurice on 2021-04-19, 15:23:57 (73.186.230.3)
Now you've done it. You can expect legions of Luddites at your door with torches, axes and pitchforks in hand. :) .......
322: High Efficiency Speaker Asylum, RE: Tri amped Sentry IV system now with measurements! (0.00)
Posted by Bill Fitzmaurice on 2021-04-15, 19:53:32 (73.186.230.3)
Change the resolution/smoothing to 1/6 octave. That's far more representative of what you can hear than higher resolution plots. .......
323: High Efficiency Speaker Asylum, RE: I can hear where 80 to 100hz sounds are located. (0.00)
Posted by Bill Fitzmaurice on 2021-04-06, 19:14:44 (73.186.230.3)
The reason JBL does that is because their subs are direct radiating, so they produce a lot of 2nd and 3rd harmonic content. .......
324: High Efficiency Speaker Asylum, RE: Can't "waveguides" also be "horns", and vice-versa ? (0.00)
Posted by Bill Fitzmaurice on 2021-04-03, 05:50:35 (73.186.230.3)
Thanks. Here's an example of wave guide marketeering, the Dayton H6512: https://www.parts-express.com/Dayton-Audio-H6512-6-1-2-x-12-Waveguide-1-3-8-18-TPI-270-318 Its description says 'A waveguide co .......
325: High Efficiency Speaker Asylum, RE: Can't "waveguides" also be "horns", and vice-versa ? (0.00)
Posted by Bill Fitzmaurice on 2021-04-02, 12:07:39 (73.186.230.3)
All horns are wave guides. Not all wave guides are horns. In order to have gain a horn throat must be less than a wavelength in dimension. You very much can have a horn that gives gain in the low end .......
326: High Efficiency Speaker Asylum, RE: Yep.... (0.00)
Posted by Bill Fitzmaurice on 2021-03-28, 10:37:22 (73.186.230.3)
That apparatus is used in front of a midrange or high frequency driver. It is not associated with transmission lines, rather it's referred to as a waveguide. It's called a K Slot for the association w .......
327: High Efficiency Speaker Asylum, RE: Terms and examples please (0.00)
Posted by Bill Fitzmaurice on 2021-03-28, 07:37:48 (73.186.230.3)
For there to be comb filtering there must be two distinct sources operating in the same pass band placed at least 1/2 wavelength apart. That's not the case with a TL. What is seen with the terminus ou .......
328: High Efficiency Speaker Asylum, RE: Yep.... (0.00)
Posted by Bill Fitzmaurice on 2021-03-28, 07:26:47 (73.186.230.3)
Yep, that's a K Slot, but it has nothing to do with a TL. .......
329: High Efficiency Speaker Asylum, RE: Terms and examples please (0.00)
Posted by Bill Fitzmaurice on 2021-03-28, 05:19:51 (73.186.230.3)
Stuffing a TL doesn't lower tuning or affect sensitivity, it suppresses harmonics of the quarter wavelength frequency. Stuffing a sealed cab lowers Q. Over-stuffing a ported cab will cause it to opera .......
330: High Efficiency Speaker Asylum, RE: Terms and examples please (0.00)
Posted by Bill Fitzmaurice on 2021-03-27, 20:21:18 (73.186.230.3)
I vaguely remember the El Pipo, but it was so forgettable that I didn't give it much notice when it came out, even though I was a contributing editor at AudioXpress at the time. I thought it odd that .......
331: High Efficiency Speaker Asylum, RE: Terms and examples please (0.00)
Posted by Bill Fitzmaurice on 2021-03-27, 14:13:13 (73.186.230.3)
The discharge end is called the terminus. I have no idea what you mean by the notch, or by 'de-comb'. A tube is not a good method of constructing a transmission line, which should be tapered for best .......
332: High Efficiency Speaker Asylum, RE: Terms and examples please (0.00)
Posted by Bill Fitzmaurice on 2021-03-27, 11:21:15 (73.186.230.3)
FWIW transmission line subs aren't high sensitivity or low distortion, and since the line has to be a quarter wavelength long they're not all that practical either. Horn load subs are also quarter wav .......
333: High Efficiency Speaker Asylum, RE: "The radiation pattern of the KHorn...is at least 180 degrees"--no. (0.00)
Posted by Bill Fitzmaurice on 2021-03-21, 07:39:38 (73.186.230.3)
I don't see any measurement conditions listed. The results anechoic will be quite different from in room, with the speaker placed in a corner. Where directivity is concerned that may only be measured .......
334: High Efficiency Speaker Asylum, RE: and yet.... (0.00)
Posted by Bill Fitzmaurice on 2021-03-12, 09:59:50 (71.169.142.68)
A tapped horn wouldn't have any more directivity than another format with the same radiating plane dimensions. Bass horns tend to have better low frequency directivity than direct radiators because th .......
335: High Efficiency Speaker Asylum, RE: No imaging below 450 HZ? Is Paul Klipsch correct? (0.00)
Posted by Bill Fitzmaurice on 2021-03-12, 07:30:31 (71.169.142.68)
My system has no problems with low frequency imaging. I can locate bass instruments or LF effects coming from the left, center or right, or from the surrounds. This is in spite of the fact that my sub .......
336: High Efficiency Speaker Asylum, RE: and yet.... (0.00)
Posted by Bill Fitzmaurice on 2021-03-11, 19:20:05 (71.161.206.187)
I can't see the charts, but he does mention using multiple subs. Whenever you increase the size of the radiating plane with multiple speakers you also lower the baffle step frequency, where radiation .......
337: High Efficiency Speaker Asylum, RE: and yet.... (0.00)
Posted by Bill Fitzmaurice on 2021-03-11, 19:14:45 (71.161.206.187)
Tapped horns have much higher THD than front loaded folded horns, so they're more easily locatable. That's on off the trade offs for their smaller size than front loaded folded horns of the same capab .......
338: High Efficiency Speaker Asylum, RE: I can hear where 80 to 100hz sounds are located. (0.00)
Posted by Bill Fitzmaurice on 2021-03-11, 19:11:09 (71.161.206.187)
Where the KHorn is concerned, and all folded horns for that matter, the bends in the horn are low pass filters, so they do reduce the above bandwidth harmonic content. But it's well designed, so it do .......
339: High Efficiency Speaker Asylum, RE: I can hear where 80 to 100hz sounds are located. (0.00)
Posted by Bill Fitzmaurice on 2021-03-11, 12:58:54 (71.161.206.187)
Crossovers aren't brickwall, and even if they were the speaker will create harmonics. As for the fundamentals versus harmonics loudness, read the linked document, especially with respect to Figure 1. .......
340: High Efficiency Speaker Asylum, I can hear where 80 to 100hz sounds are located. (0.00)
Posted by Bill Fitzmaurice on 2021-03-11, 05:06:11 (71.169.171.21)
It may seem that way, but what one can actually locate is the harmonics. Even at that when you're hearing the second and third harmonics, from 160 to 300Hz, those wavelengths are still too short for p .......
341: High Efficiency Speaker Asylum, RE: No imaging below 450 HZ? Is Paul Klipsch correct? (0.00)
Posted by Bill Fitzmaurice on 2021-03-09, 12:19:34 (72.71.226.102)
My profile was accurate when I initially filled it out. Not my fault the forum software doesn't update it. I guess that's to be expected when the forum software is almost as old as I am. (Searches for .......
342: High Efficiency Speaker Asylum, RE: No imaging below 450 HZ? Is Paul Klipsch correct? (0.00)
Posted by Bill Fitzmaurice on 2021-03-06, 19:18:27 (72.71.226.102)
Way back when, it must have been '71, I built a KHorn style corner horn loaded with two twelves, which I low passed, the drivers separately connected to the L and R, and a pair of 1x8 bookshelves that .......
343: High Efficiency Speaker Asylum, RE: This is not a difficult to prove false issue Easy to prove at home for anybody (0.00)
Posted by Bill Fitzmaurice on 2021-03-06, 10:55:11 (72.71.226.102)
Room modes have nothing to do with how reflected waves below 400Hz comprise a far higher percentage of what's heard than with higher frequencies. Above that the direct wave comprises more of what's he .......
344: High Efficiency Speaker Asylum, RE: Of course you can locate sound at 400 hz Fat in the zone for human hunters (0.00)
Posted by Bill Fitzmaurice on 2021-03-05, 19:21:11 (72.71.226.102)
Not difficult at all, if the speaker is outdoors. Indoors where you'd be hearing almost as much reflected sound as direct you'd be able to tell the general direction, but not with pinpoint accuracy by .......
345: High Efficiency Speaker Asylum, RE: T/S for Radio Shack 40-1286 (0.00)
Posted by Bill Fitzmaurice on 2021-03-05, 13:02:04 (72.71.226.102)
I wouldn't use them OB, unless you don't care that there's no bass, but with that high of a Qes they'd be good in an IB. Pretty terrible in any kind of smaller sealed or vented box. Even in 5 cu ft se .......
346: High Efficiency Speaker Asylum, RE: +1. Once again, the voice of reason. (0.00)
Posted by Bill Fitzmaurice on 2021-03-05, 09:52:49 (72.71.226.102)
Yeah, it's like asking 'can I put this Ford engine into this Chevy', but no matter how many times he's told it doesn't work that way he just doesn't get it. .......
347: High Efficiency Speaker Asylum, RE: No imaging below 450 HZ? Is Paul Klipsch correct? (0.00)
Posted by Bill Fitzmaurice on 2021-03-05, 05:23:11 (72.71.226.102)
Considering that Wilson died in 1977, before subwoofers had come into common usage, I doubt he'd ever heard or built a folded horn sub. The bass horns that existed within the time frame of his experie .......
348: High Efficiency Speaker Asylum, RE: No imaging below 450 HZ? Is Paul Klipsch correct? (0.00)
Posted by Bill Fitzmaurice on 2021-03-05, 05:09:34 (72.71.226.102)
That doesn't make any difference where the question is concerned. No speaker is going to have much in the way of imaging below 450Hz because the radiation pattern is too wide. You can't directionally .......
349: High Efficiency Speaker Asylum, RE: Would Parts Express .67 cu size sub cabinet would work with Realistic 8 inch full range speaker? (0.00)
Posted by Bill Fitzmaurice on 2021-03-05, 04:58:02 (72.71.226.102)
No one can tell you anything about driver/box compatibility without the driver Theile/Small specs. .......
350: High Efficiency Speaker Asylum, RE: No imaging below 450 HZ? Is Paul Klipsch correct? (0.00)
Posted by Bill Fitzmaurice on 2021-03-04, 15:05:13 (72.71.226.102)
And exactly what would be the difference between a mono and a stereo speaker? .......
351: High Efficiency Speaker Asylum, RE: No imaging below 450 HZ? Is Paul Klipsch correct? (0.00)
Posted by Bill Fitzmaurice on 2021-03-04, 08:39:36 (72.71.226.102)
Folded horns and wooden horns don't work well? Not in my experience, which includes listening to my wood folded horn subwoofer on average 12 hours a day for the last 15 years. That's because my living .......
352: High Efficiency Speaker Asylum, RE: The Klipschorn was designed as a mono speaker. (0.00)
Posted by Bill Fitzmaurice on 2021-03-03, 19:26:00 (72.71.226.102)
PK's setup in his Hope studio was a Heresy in the center, flanked by KHorns, or at least that's what he had when I was there circa 1974. He used a center speaker there because the KHorns were some 20 .......
353: High Efficiency Speaker Asylum, Is Paul Klipsch correct? Yes. (0.00)
Posted by Bill Fitzmaurice on 2021-03-03, 19:09:45 (72.71.226.102)
Imaging is related to the ability to directionally locate. That's made considerably more difficult if the speaker radiation pattern is wide. The radiation pattern of the KHorn, or for that matter just .......
354: High Efficiency Speaker Asylum, RE: I have a set of NOS Realistic 8 inch Full Range Drivers, will they fit in a Parts Express .56 cu speaker box? (0.00)
Posted by Bill Fitzmaurice on 2021-03-01, 04:52:43 (72.71.226.102)
Without the full set of T/S specs no one can say. .......
355: High Efficiency Speaker Asylum, RE: Should I be concerned regarding Misco / Oaktron 4.5 Full Range Speaker Drivers only going out to 18 hz? (0.00)
Posted by Bill Fitzmaurice on 2021-02-28, 05:25:52 (72.71.226.102)
Have you modeled these with speaker modeling software? I did,resulting in the reply below where I said I wouldn't use them. IMO you should have bought a complete kit. You can't toss any driver into an .......
356: High Efficiency Speaker Asylum, RE: So -- is this the Misco/Oaktron driver to which the OP refers? (0.00)
Posted by Bill Fitzmaurice on 2021-02-27, 15:13:11 (72.71.226.102)
$68 isn't exactly costly, and in quantity I don't see paying more than $50 for them. There are many drivers far more expensive. Not that I recommend spending more for a 4.5 inch, but you certainly can .......
357: High Efficiency Speaker Asylum, RE: Misco / Oakton 4.5 Full Range Driver Looks like Omega RS5 Driver, huh? (0.00)
Posted by Bill Fitzmaurice on 2021-02-27, 09:56:37 (72.71.226.102)
Are these written specs? Or measured SPL charts. The former are advertising, the latter are objective data. .......
358: High Efficiency Speaker Asylum, RE: A question on sensitivity AKA don't hurt my feelings : ) (0.00)
Posted by Bill Fitzmaurice on 2021-02-24, 18:42:47 (72.71.226.102)
All a more sensitive speaker does is to play louder at the same amp volume setting. If you can't get the volume you want from your amp a more sensitive speaker would help. By your description you don' .......
359: High Efficiency Speaker Asylum, RE: All Fouled Up..........or similar? (nt) (0.00)
Posted by Bill Fitzmaurice on 2021-02-22, 19:28:24 (71.168.119.217)
That would be the 'G' rated version. .......
360: High Efficiency Speaker Asylum, Running a 12 Ohm driver on an 8 Ohm crossover... (0.00)
Posted by Bill Fitzmaurice on 2021-02-22, 10:15:54 (71.168.119.217)
Running a 12 Ohm driver on an 8 Ohm crossover is going to lower the X-over frequency of the driver if it's a first order high pass, ie., just a capacitor. With s higher order filter the transfer funct .......
361: High Efficiency Speaker Asylum, RE: Electro-Voice Sentry IV-B crossover question (0.00)
Posted by Bill Fitzmaurice on 2021-02-22, 04:57:37 (71.168.119.217)
Crossovers are specific to the driver impedance, and if well designed they're specific to the drivers. .......
362: High Efficiency Speaker Asylum, RE: Edgar Horns (0.00)
Posted by Bill Fitzmaurice on 2021-02-20, 06:18:17 (71.168.119.217)
There is a another clue on the label, where the model says 'VP'. I bet that stands for Voigt Pipe. .......
363: High Efficiency Speaker Asylum, RE: Edgar Horns (0.00)
Posted by Bill Fitzmaurice on 2021-02-19, 11:44:04 (71.168.119.217)
Speaker Builder last published in 2000, and Bruce Edgar's last article was maybe in 1998. I don't recall seeing that design in Speaker Builder, and it doesn't appear to be a horn. It may be a transmis .......
364: High Efficiency Speaker Asylum, RE: Hempopotamus 8 inch Coaxial Speakers (0.00)
Posted by Bill Fitzmaurice on 2021-02-18, 19:09:54 (71.168.119.217)
The comments all apply to electric instrument speakers, which cannot be used as subs. .......
365: High Efficiency Speaker Asylum, RE: Indeed... (0.00)
Posted by Bill Fitzmaurice on 2021-02-07, 07:50:38 (71.161.199.7)
The K-120 isn't typical of electric guitar drivers. The 50Hz Fs, for instance, is half that of the average electric guitar driver. .......
366: High Efficiency Speaker Asylum, RE: Hempopotamus 8 inch Coaxial Speakers (0.00)
Posted by Bill Fitzmaurice on 2021-02-06, 19:22:35 (71.161.199.7)
The only Hempopotamus drivers I see there are for electric guitar. .......
367: High Efficiency Speaker Asylum, RE: Is it one on your wib site? (0.00)
Posted by Bill Fitzmaurice on 2021-01-26, 11:11:06 (71.161.199.7)
Mine is the Table Tuba. Most over the top HT guys build Tuba HTs, mainly because they don't think a horn loaded with an eight or ten will shake the walls, but I've yet to have a complaint a TT isn't e .......
368: High Efficiency Speaker Asylum, RE: Very interesting! (0.00)
Posted by Bill Fitzmaurice on 2021-01-26, 11:07:23 (71.161.199.7)
There wasn't that much thought put into it. I put it where it worked best and it just worked out that way. .......
369: High Efficiency Speaker Asylum, RE: It depends... (0.00)
Posted by Bill Fitzmaurice on 2021-01-26, 08:21:18 (71.161.199.7)
14 feet. I don't need to delay the sub signal. .......
370: High Efficiency Speaker Asylum, RE: It depends... (0.00)
Posted by Bill Fitzmaurice on 2021-01-26, 05:34:57 (71.161.199.7)
FWIW my sub is a foot behind me, my mains 12 feet in front of me. My crossover is 4th order at 100Hz. I can't localize the sub at any volume, cannot even tell that it's behind me. That's partly due to .......
371: High Efficiency Speaker Asylum, RE: Stephens Trusonic Help (0.00)
Posted by Bill Fitzmaurice on 2021-01-25, 11:11:15 (71.161.199.7)
There's no way of knowing without specs. You'd have to measure the specs to be sure. That's simple if you have the gear, not so much if you don't. .......
372: High Efficiency Speaker Asylum, RE: why an 8" driver for a 35Hz sub (0.00)
Posted by Bill Fitzmaurice on 2021-01-25, 06:14:24 (71.161.199.7)
That's my point too. The low frequency corner of a horn is determined by its length. The longer the horn the lower it goes. A smaller driver allows a horn to go lower from a given overall box size. Th .......
373: High Efficiency Speaker Asylum, RE: So worst case, at least with your horn subs, I could end up with peaks and dips... (0.00)
Posted by Bill Fitzmaurice on 2021-01-24, 16:58:59 (71.161.199.7)
The peaks and dips come from the combined response of the direct wave from the sub and the reflected waves from the room walls, floor and ceiling. By putting the sub very close to the LP you minimize .......
374: High Efficiency Speaker Asylum, why an 8" driver for a 35Hz sub (0.00)
Posted by Bill Fitzmaurice on 2021-01-24, 16:55:29 (71.161.199.7)
Why? Because that's all you need. A smaller driver allows a longer horn in a smaller box. .......
375: High Efficiency Speaker Asylum, RE: "room response issues" (0.00)
Posted by Bill Fitzmaurice on 2021-01-24, 12:12:48 (71.169.142.41)
Peak and dips, mainly dips, in response, which cannot be fixed with EQ. .......
376: High Efficiency Speaker Asylum, RE: As there is no 'sub-woofer' forum, might as well start here..... (0.00)
Posted by Bill Fitzmaurice on 2021-01-24, 10:21:00 (71.169.142.41)
In the vicinity of 100Hz, but it's not that simple. If play a 100Hz tone with high THD you'll hear the primary components of that THD, 200Hz and 300Hz, which will make the sub directionally locatable. .......
377: High Efficiency Speaker Asylum, RE: Start up of Pratt & Whitney R-2800 Double Wasp WW2 Hellcat engine (0.00)
Posted by Bill Fitzmaurice on 2021-01-22, 19:31:53 (71.169.142.41)
The difference in the sound would have been between air cooled radial engines and water cooled engines. The radials rattled, like the air cooled engines in VW bugs. But we, the British and the Germans .......
378: High Efficiency Speaker Asylum, RE: Stephens Trusonic Help (0.00)
Posted by Bill Fitzmaurice on 2021-01-20, 10:28:53 (71.169.142.41)
Stephens was taken over by Utah before T/S specs came into common usage. Utah later became Pyle, which today exists in name only. .......
379: High Efficiency Speaker Asylum, RE: Altec 902-8T measuring question (0.00)
Posted by Bill Fitzmaurice on 2021-01-10, 11:45:49 (71.169.142.41)
The difference in DCR is probably due to the drivers being from different production batches perhaps years apart, or one or both could have replacement voice coils/diaphragms. Their sensitivity won't .......
380: High Efficiency Speaker Asylum, RE: Altec 902-8T measuring question (0.00)
Posted by Bill Fitzmaurice on 2021-01-10, 10:14:22 (71.169.142.41)
Those values are high for a woofer, but not for a compression driver. Impedance matters more than DCR, that's what I'd be measuring with Dayton Audio DATS. .......
381: High Efficiency Speaker Asylum, Supravox 215-2000 (0.00)
Posted by Bill Fitzmaurice on 2021-01-05, 08:20:40 (71.161.206.57)
The specs aren't suitable for a 35Hz horn, and the price is ten times what one needs to spend. The OP is building a sub woofer, not a full range speaker. .......
382: High Efficiency Speaker Asylum, RE: Happy High Efficiency Holidays! (0.00)
Posted by Bill Fitzmaurice on 2020-12-28, 05:16:07 (71.161.206.163)
What picture? .......
383: High Efficiency Speaker Asylum, RE: 8 inch driver recommendation for 1/2 wavelength 35 Hz horn subwoofer? (0.00)
Posted by Bill Fitzmaurice on 2020-12-26, 14:51:08 (71.161.206.163)
Most auto sound woofers have specs best suited to small sealed boxes, so Q is usually too high and EBP too low for good results in a horn. .......
384: High Efficiency Speaker Asylum, RE: 8 inch driver recommendation for 1/2 wavelength 35 Hz horn subwoofer? (0.00)
Posted by Bill Fitzmaurice on 2020-12-26, 13:19:49 (71.161.206.163)
>"Getting the highest possible SPL from the shortest excursion" is easier said than done especially in Sub freqs It's not all that difficult. My Table Tuba, loaded with an eight, will deliver 125dB at .......
385: High Efficiency Speaker Asylum, RE: 8 inch driver recommendation for 1/2 wavelength 35 Hz horn subwoofer? (0.00)
Posted by Bill Fitzmaurice on 2020-12-26, 06:19:44 (71.161.206.163)
For the most part you can't detect distortion below 100Hz. That's because distortion occurs in the harmonics, so 60Hz distortion, for instance, is heard at 120,180,240,300Hz etc. That doesn't mean you .......
386: High Efficiency Speaker Asylum, RE: 8 inch driver recommendation for 1/2 wavelength 35 Hz horn subwoofer? (0.00)
Posted by Bill Fitzmaurice on 2020-12-24, 19:32:26 (71.161.206.163)
I use the Dayton DCS 205-4 in a number of my folded horn subs. Fs is lower than needed, but that's easily compensated for with a small rear chamber. Eights with Fs higher than 35Hz and xmax longer tha .......
387: High Efficiency Speaker Asylum, RE: Ellipticor Woofer 38WE/8582T00 (0.00)
Posted by Bill Fitzmaurice on 2020-12-23, 04:55:48 (71.181.91.36)
There is no best ten inch woofer, there's only woofers that have the correct specs as spelled out in the plans. For music only I recommend a Table Tuba, which will cover 30-100Hz. Be prepared to build .......
388: High Efficiency Speaker Asylum, RE: Ellipticor Woofer 38WE/8582T00 (0.00)
Posted by Bill Fitzmaurice on 2020-12-21, 07:35:17 (71.181.91.36)
If you're going to build a ten cubic foot box make it a folded horn loaded with a ten and you'll end up with higher sensitivity than a direct radiator, far lower THD, and a lot less expensive driver a .......
389: High Efficiency Speaker Asylum, RE: Ellipticor Woofer 38WE/8582T00 (0.00)
Posted by Bill Fitzmaurice on 2020-12-21, 04:55:17 (71.181.91.36)
There is an inevitable trade off between sensitivity and low frequency extension. If you want to run a direct radiator to even 30Hz with 95dB sensitivity it's simply not going to happen. No driver can .......
390: High Efficiency Speaker Asylum, RE: Ellipticor Woofer 38WE/8582T00 (0.00)
Posted by Bill Fitzmaurice on 2020-12-20, 06:39:41 (71.169.144.69)
Strictly speaking this isn't a particularly high sensitivity driver. It does reach 95dB above 100Hz, but in an optimal ported box F3 is only 70Hz, with F10 at 31Hz. This is what you can expect from an .......
391: High Efficiency Speaker Asylum, RE: "the less a transducer travels generating waveforms the 'faster' it is" (0.00)
Posted by Bill Fitzmaurice on 2020-12-18, 09:02:36 (71.255.115.173)
"When you play signal into the voice coil of the driver attached to the plastic horn isn't that what you are doing?" No, it isn't. A horn works just like the output transformer of a tube amp. It take .......
392: High Efficiency Speaker Asylum, RE: Speaker Recommendations for low-power amps ? (0.00)
Posted by Bill Fitzmaurice on 2020-12-14, 08:12:28 (71.255.115.173)
In short, yes, and not in the good way. Even if you discount the issue of room modes, which can only be addressed with multiple subs placed around the room, Allison Effect dictates that low frequency .......
393: High Efficiency Speaker Asylum, RE: Speaker Recommendations for low-power amps ? (0.00)
Posted by Bill Fitzmaurice on 2020-12-14, 05:13:08 (71.255.115.173)
The problem is that you can't get the subs and the mains to both give the best results when they share the same footprint. If you're good with that then set them up that way. That said, IME 99% of tho .......
394: High Efficiency Speaker Asylum, Re: Front horns are bells... (0.00)
Posted by Bill Fitzmaurice on 2020-12-11, 08:29:25 (71.161.202.207)
Horns are not bells. They look like bells, but they don't act like bells. Read Don's post again. Nowhere does he say that his plastic horns have a 'plastic horn' sound. He says the opposite. ::: TOPIC .......
395: High Efficiency Speaker Asylum, RE: Adding a digital component.. (0.00)
Posted by Bill Fitzmaurice on 2020-12-05, 14:31:48 (71.161.205.33)
I've never come across one myself. .......
396: High Efficiency Speaker Asylum, RE: Adding a digital component.. (0.00)
Posted by Bill Fitzmaurice on 2020-12-05, 13:05:54 (71.161.205.33)
My experience measuring my speakers is the same as Floyd Toole's with the speakers he's measured: I've never had a speaker that sounded good measure bad, and I've never had a speaker that measured bad .......
397: High Efficiency Speaker Asylum, RE: "the less a transducer travels generating waveforms the 'faster' it is" (0.00)
Posted by Bill Fitzmaurice on 2020-12-05, 09:33:50 (71.161.205.33)
There's no plastic sound, unless you hit it with a stick. Claims to the contrary are from those who listen with their eyes. You know...audiophiles. .......
398: High Efficiency Speaker Asylum, RE: Adding a digital component.. (0.00)
Posted by Bill Fitzmaurice on 2020-12-01, 13:14:01 (71.181.87.147)
You may have heard improvements, it may have been confirmation bias. That's why engineers don't go by what they hear alone, they measure the results. You may not be able to hear everything that can be .......
399: High Efficiency Speaker Asylum, RE: Adding a digital component.. (0.00)
Posted by Bill Fitzmaurice on 2020-11-30, 19:08:16 (71.181.87.147)
That's part of it. Can you hear it? It's like those who insist that tweeters with 40kHz response gives improved sound over those with 'only' 20kHz response. They think that they can hear the differenc .......
400: High Efficiency Speaker Asylum, RE: "the less a transducer travels generating waveforms the 'faster' it is" (0.00)
Posted by Bill Fitzmaurice on 2020-11-29, 13:44:37 (71.161.222.135)
Want to become an audiophile? Cut a half inch hole in your pants pocket. Walk downtown to the nearest toy store, buy a bag of marbles. Take the marbles out of the bag, put them in the pocket with the .......
401: High Efficiency Speaker Asylum, RE: Also such a thing as "line level' crossovers. (0.00)
Posted by Bill Fitzmaurice on 2020-11-29, 13:37:05 (71.161.222.135)
We were contemporaries, on the road at the same time, never met. The thing about being a touring musician is that if you're successful you don't get to see many acts, you're too busy working. I met do .......
402: High Efficiency Speaker Asylum, RE: Also such a thing as "line level' crossovers. (0.00)
Posted by Bill Fitzmaurice on 2020-11-29, 11:55:10 (71.161.222.135)
Karen Carpenter was a pretty good drummer as well. She never cared for fronting the band, always considering herself not a singer but rather a drummer who sang. .......
403: High Efficiency Speaker Asylum, RE: What do think about the Mini DSP 4 x 10 Hd (0.00)
Posted by Bill Fitzmaurice on 2020-11-29, 11:51:23 (71.161.222.135)
It appears to be fine, and has a good reputation. I don't have personal experience with it. It doesn't have the EQ etc that the DBX does. If you only have RCA connections that would take the DBX off t .......
404: High Efficiency Speaker Asylum, RE: Many thanks for keeping Bill distracted... (0.00)
Posted by Bill Fitzmaurice on 2020-11-29, 06:09:54 (71.161.222.135)
They're OK, but it's the spec versus sound thing. Modern op amps spec out far better, but they don't necessarily sound better. .......
405: High Efficiency Speaker Asylum, RE: Also such a thing as "line level' crossovers. (0.00)
Posted by Bill Fitzmaurice on 2020-11-28, 20:29:41 (71.161.222.135)
The main difference between line level passive crossovers versus electronic crossovers is very high insertion losses, which grow progressively worse with each additional filter order. They're better t .......
406: High Efficiency Speaker Asylum, RE: Many thanks for keeping Bill distracted... (0.00)
Posted by Bill Fitzmaurice on 2020-11-28, 20:03:36 (71.161.222.135)
Distracted no, I just know better than to try to convert a Luddite. BTW, how's the Flat Earth Society doing these days? Where electronic crossovers are concerned this ain't my first rodeo. I designed .......
407: High Efficiency Speaker Asylum, RE: That's a pretty bold statement... (0.00)
Posted by Bill Fitzmaurice on 2020-11-28, 20:01:01 (71.161.222.135)
I'd use a digital antenna for my local stations if that was an option, but when I say 'local' I mean Portland, Maine, 50 miles away, and Boston, 80 miles away, with plenty of mountains in between. Net .......
408: High Efficiency Speaker Asylum, RE: That's a pretty bold statement... (0.00)
Posted by Bill Fitzmaurice on 2020-11-28, 11:51:22 (71.161.222.135)
We're not totally off topic. I bet there are those who yearn for the days of black and white TV and rabbit ear antennas too. .......
409: High Efficiency Speaker Asylum, RE: That's a pretty bold statement... (0.00)
Posted by Bill Fitzmaurice on 2020-11-28, 10:16:26 (71.161.222.135)
I got my Sony, and a TCL for my daughter, because they're android. I didn't care for the Roku remote or the Amazon adware built into Firestick. This month I'm cutting the cable, the latest price incre .......
410: High Efficiency Speaker Asylum, RE: That's a pretty bold statement... (0.00)
Posted by Bill Fitzmaurice on 2020-11-27, 19:11:56 (71.161.222.135)
My Sony has YouTube as a built in app. Not YouTube TV, YouTube. Out of curiosity I opened it last week and found the resolution on the 55 inch screen 12 feet in front of me is far better than on my 17 .......
411: High Efficiency Speaker Asylum, RE: "the less a transducer travels generating waveforms the 'faster' it is" (0.00)
Posted by Bill Fitzmaurice on 2020-11-27, 15:19:55 (71.161.222.135)
Without measured data there's no telling what actually occurred. I suspect the actual content at 100Hz was considerably greater with the high Q driver, while the second and third harmonic content at 2 .......
412: High Efficiency Speaker Asylum, RE: I'm still waiting... (0.00)
Posted by Bill Fitzmaurice on 2020-11-27, 14:33:11 (71.161.222.135)
My AVR converts digital input to five channels of analog output, including a crossover between the sub and mains. .......
413: High Efficiency Speaker Asylum, RE: That's a pretty bold statement... (0.00)
Posted by Bill Fitzmaurice on 2020-11-27, 14:27:16 (71.161.222.135)
My first 42 inch LED TV was a bit of a disappointment as well with 480 content, because the screen was large enough to make the picture less distinct. DVDs looked good, but broadcast TV was only fair .......
414: High Efficiency Speaker Asylum, RE: That's a pretty bold statement... (0.00)
Posted by Bill Fitzmaurice on 2020-11-27, 13:07:22 (71.161.222.135)
A/D and D/A has been the norm in recording studios for going on thirty years now. Even if you're listening to wax if it was mastered after 1990 it was probably subjected to at least one A/D and then D .......
415: High Efficiency Speaker Asylum, RE: That's a pretty bold statement... (0.00)
Posted by Bill Fitzmaurice on 2020-11-27, 12:04:31 (71.161.222.135)
Saying you prefer analog electronics to listen to vinyl is like saying you prefer to watch vintage TV or movies on a CRT TV. .......
416: High Efficiency Speaker Asylum, RE: Adding a digital component.. (0.00)
Posted by Bill Fitzmaurice on 2020-11-27, 08:14:56 (71.161.222.135)
Seeing that a CD sample rate is 44.1kHz, so it's only good to 20kHz analog content, and that for an A/D sampling frequency of 48 kHz the measured frequency response will be better than ± 0.1 dB for th .......
417: High Efficiency Speaker Asylum, RE: "the less a transducer travels generating waveforms the 'faster' it is" (0.00)
Posted by Bill Fitzmaurice on 2020-11-27, 07:58:12 (71.161.222.135)
Low Q results in high sensitivity in the mids, and a high F3. Some may call the result fast, I'd call it thin. With high Q sensitivity is lost in the lows, while it's increased in the midbass. The usu .......
418: High Efficiency Speaker Asylum, RE: Adding a digital component.. (0.00)
Posted by Bill Fitzmaurice on 2020-11-26, 08:25:11 (71.161.210.233)
The PA2 has performance that would have required adding another digit to the price not so many years ago, and no matter how much you spend it's unattainable with analog. It's not far off from the DEQX .......
419: High Efficiency Speaker Asylum, RE: Active x-overs - Sublime Acoustics... (0.00)
Posted by Bill Fitzmaurice on 2020-11-25, 20:06:07 (71.161.210.233)
If I was to use an active crossover it would be digital, and it would incorporate a full function DSP. With all that it would still come in less expensive than the K231. For instance, the DBX PA2. ::: .......
420: High Efficiency Speaker Asylum, RE: Electrostats are slow (0.00)
Posted by Bill Fitzmaurice on 2020-11-25, 19:57:47 (71.161.210.233)
Lowthers aren't all that special. There are quite a few very low Qes low Mms high sensitivity drivers. While their Mms is low as far as the average cone driver is concerned it's high compared to the a .......
421: High Efficiency Speaker Asylum, I think they're referring to transient response (0.00)
Posted by Bill Fitzmaurice on 2020-11-25, 05:54:31 (71.161.210.233)
If that's what they're referring to then that's what they should say. Where transient response is concerned an electrostat tends to be better than a horn. It has less to do with the driver Mms than wi .......
422: High Efficiency Speaker Asylum, RE: "the less a transducer travels generating waveforms the 'faster' it is" (0.00)
Posted by Bill Fitzmaurice on 2020-11-24, 19:17:32 (71.161.210.233)
The further a membrane/cone travels the louder the speaker plays. The entire notion of fast and slow speakers is audiophile nonsense, with no basis in engineering fact. They use the terms to describe .......
423: High Efficiency Speaker Asylum, RE: Electrostats are slow (0.00)
Posted by Bill Fitzmaurice on 2020-11-24, 19:10:59 (71.161.210.233)
For sure. They're so slow that a song played in 'A' is heard in 'G'. .......
424: High Efficiency Speaker Asylum, RE: Speaker driver or speaker box? (0.00)
Posted by Bill Fitzmaurice on 2020-11-23, 06:13:12 (71.161.210.233)
As I recall it was a totally subjective listening test. That makes the conclusions drawn suspect. Watch this video starting at the 2:45 marker. .......
425: High Efficiency Speaker Asylum, RE: Bob Carver tweaked a SS amp to sound exacly like a CJ years ago... (0.00)
Posted by Bill Fitzmaurice on 2020-11-21, 06:33:31 (71.255.115.186)
Carver's concoction didn't duplicate tuba amp characteristics when said tube amp is pushed past its linear response capabilities. It's the same reason why a 50 watt 6L6 push-pull doesn't sound like a .......
426: High Efficiency Speaker Asylum, RE: on the other hand, HD levels of most loudspeakers is high (0.00)
Posted by Bill Fitzmaurice on 2020-11-20, 08:36:16 (71.255.115.186)
The THD may approach 100% at 30hz, but I wouldn't be running that speaker lower than 80Hz. .......
427: High Efficiency Speaker Asylum, RE: If it is high level HD..... (0.00)
Posted by Bill Fitzmaurice on 2020-11-20, 05:18:23 (71.255.115.186)
It's not high level THD, it's a combination of moderate THD plus compression. To some extent it can be duplicated electronically, that's what electric guitar modeling pre-amps and amps do. It can't be .......
428: High Efficiency Speaker Asylum, RE: Speaker Recommendations for low-power amps ? (0.00)
Posted by Bill Fitzmaurice on 2020-11-15, 13:14:34 (71.169.140.186)
There's a solution to WAF: Man Cave. Or divorce, but a Man Cave is less expensive. .......
429: High Efficiency Speaker Asylum, RE: Speaker Recommendations for low-power amps ? (0.00)
Posted by Bill Fitzmaurice on 2020-11-15, 06:01:19 (71.169.140.186)
Where this particular issue is concerned there's no need to compromise. Put the subs where they work best and the mains where they work best. Having that ability is one of the main reasons for placing .......
430: High Efficiency Speaker Asylum, RE: Speaker Recommendations for low-power amps ? (0.00)
Posted by Bill Fitzmaurice on 2020-11-13, 18:48:38 (71.161.205.180)
One problem solved, another created. Subs need to go where they work best, mains need to go where they work best. That's almost never within the same footprint, if only for the elimination of Allison .......
431: High Efficiency Speaker Asylum, RE: Speaker Recommendations for low-power amps ? (0.00)
Posted by Bill Fitzmaurice on 2020-11-13, 10:32:08 (71.161.205.180)
I don't recall seeing the OP state that he intends to use subs, nor is the Heresy a bookshelf speaker. .......
432: High Efficiency Speaker Asylum, RE: Speaker Recommendations for low-power amps ? (0.00)
Posted by Bill Fitzmaurice on 2020-11-13, 09:05:42 (71.161.205.180)
Small size and high sensitivity are pretty much mutually exclusive. Google 'Hoffman's Iron Law'. .......
433: High Efficiency Speaker Asylum, RE: Sweet center channel! (0.00)
Posted by Bill Fitzmaurice on 2020-11-09, 08:56:28 (71.161.203.83)
You'll find having the screen up above the center channel works much better, both visually and aurally. TVs never should have been placed low, but back when all we had was CRT high placement wasn't a .......
434: High Efficiency Speaker Asylum, RE: Gioia Speaker , its design and terminology (0.00)
Posted by Bill Fitzmaurice on 2020-11-09, 08:42:40 (71.161.203.83)
There's not enough detail in that picture to know what it is. Going to the maker website it seems that it's a variation of the classic Altec A7, a bass reflex loaded woofer with a short horn on the fr .......
435: High Efficiency Speaker Asylum, RE: Bassoon , psychoacoustic hearing and speaker idea (0.00)
Posted by Bill Fitzmaurice on 2020-11-09, 05:04:38 (71.161.203.83)
Google 'missing fundamental'. This phenomenon has been employed in electronic products since the days of Alexander Graham Bell, and in musical instruments since Joshua at the walls of Jericho. ::: TOP .......
436: High Efficiency Speaker Asylum, RE: Id swear it was a heresy (0.00)
Posted by Bill Fitzmaurice on 2020-10-29, 14:17:34 (72.71.249.27)
If you measured a Heresy in a corner it would behave like any direct radiating speaker does in 1/8th space. .......
437: High Efficiency Speaker Asylum, RE: Klipsch corner loading aes graphs ? (0.00)
Posted by Bill Fitzmaurice on 2020-10-29, 05:33:19 (72.71.249.27)
All of the Klipschorn measurements done by PK were corner loaded. Any speaker that's lifted off the floor will show reduced output where the distance to the floor is 1/4 wavelength, and there will be .......
438: High Efficiency Speaker Asylum, If you play ALL types of music, you need a pair of subwoofers. (0.00)
Posted by Bill Fitzmaurice on 2020-10-25, 18:44:31 (72.71.249.27)
This may be true if your mains lack the low frequency extension and output capability to deliver what you want, but by and large that wouldn't apply to a pair of Valencias. .......
439: High Efficiency Speaker Asylum, RE: Do I really need a Sub? (0.00)
Posted by Bill Fitzmaurice on 2020-10-23, 19:11:58 (72.71.249.27)
You shouldn't need a sub for music. You might for home theater. If that was the case it would take a pair of very large subs to add much to what the Valencia are capable of. .......
440: High Efficiency Speaker Asylum, RE: In audio, everything matters... (0.00)
Posted by Bill Fitzmaurice on 2020-10-12, 19:12:30 (72.71.249.27)
Where precision and low inductance is concerned the only way to get that is to make a fixed value LPad with high quality low inductance resistors. .......
441: High Efficiency Speaker Asylum, RE: converting round cabinet vent to a slot vent (0.00)
Posted by Bill Fitzmaurice on 2020-10-02, 12:42:48 (71.161.207.15)
Just about any and every speaker modeling software program will figure it out for you. I use WinISD 0.7 myself. .......
442: High Efficiency Speaker Asylum, RE: Who has experience with the C34 back loaded horn? I am considering building a pair. (0.00)
Posted by Bill Fitzmaurice on 2020-09-15, 12:45:32 (71.161.207.15)
You don't have to use that type of driver in a tapped horn. Danley does to make them as bulletproof as possible. One of the trade offs for the relatively small size of the tapped horn is higher excurs .......
443: High Efficiency Speaker Asylum, RE: Who has experience with the C34 back loaded horn? I am considering building a pair. (0.00)
Posted by Bill Fitzmaurice on 2020-09-15, 05:10:14 (71.161.207.15)
Back loaded horns have a major inherent flaw, a response dip where the front and rear waves meet 180 degrees apart. It's the major reason why they disappeared from the marketplace long ago,even in pro .......
444: High Efficiency Speaker Asylum, RE: Which are the most efficient speakers? (0.00)
Posted by Bill Fitzmaurice on 2020-09-03, 18:47:14 (71.161.207.15)
107dB sensitivity is 31% efficiency, so it's pretty good. 98dB sensitivity, which many consider to be high efficiency, is only 4%. .......
445: High Efficiency Speaker Asylum, Klipsch Jubilee or Danley. (0.00)
Posted by Bill Fitzmaurice on 2020-08-30, 10:39:48 (71.161.207.15)
They're not bad, but where manufactured speakers are concern Danley Sound Labs probably make the highest sensitivity. .......
446: High Efficiency Speaker Asylum, RE: Any opinions on the Wharfdale SI horn sub designs?. Bill?. (0.00)
Posted by Bill Fitzmaurice on 2020-08-23, 05:45:26 (71.161.207.15)
I bet when you pull the cover off they'll look like the JBL Keele W horn. It's been copied by dozens of companies. .......
447: High Efficiency Speaker Asylum, RE: Any opinions on the Wharfdale SI horn sub designs?. Bill?. (0.00)
Posted by Bill Fitzmaurice on 2020-08-22, 19:16:37 (71.161.207.15)
They appear to be W horns. Without seeing data that isn't shown on their website that's about all I can say, other than 101dB sensitivity isn't exactly impressive. .......
448: High Efficiency Speaker Asylum, RE: Better than the folded horns in my EdgarHorns... (0.00)
Posted by Bill Fitzmaurice on 2020-08-18, 07:22:25 (71.161.207.15)
My HT folded horn has a 14 foot path, with a 28Hz F3. Crossed at 80Hz to the mains there's no audible delay with respect to the mains. What's painfully obvious at 500Hz you can't hear at 80Hz. Where t .......
449: High Efficiency Speaker Asylum, RE: 3dB more than I would guess from the bass horn.... (0.00)
Posted by Bill Fitzmaurice on 2020-08-17, 11:01:59 (71.161.207.15)
There's an SPL chart on the review printed in French. Sensitivity is good, but as expected from a bass horn that's only some five feet long F3 is around 60Hz. .......
450: High Efficiency Speaker Asylum, RE: Vertical lines (0.00)
Posted by Bill Fitzmaurice on 2020-08-13, 19:29:19 (71.161.207.15)
I wrote for Speaker Builder and Audio xPress. I've lost track of how many articles I had published but I'm sure it was over thirty. .......
451: High Efficiency Speaker Asylum, Vertical lines (0.00)
Posted by Bill Fitzmaurice on 2020-08-11, 07:29:38 (71.161.207.15)
Vertical line sources aren't exactly new or unknown. Harry Olson was describing their benefits in the 1940s. .......
452: High Efficiency Speaker Asylum, Bose 901 (0.00)
Posted by Bill Fitzmaurice on 2020-08-06, 18:50:08 (71.161.207.15)
That's correct. The 901 had eight drivers facing the wall, with only one facing the room. That controlled the high frequency combing, but it also created other issues, like vague imaging. .......
453: High Efficiency Speaker Asylum, RE: Have you heard the Sweet Sixteen speakers? link (0.00)
Posted by Bill Fitzmaurice on 2020-08-05, 14:13:06 (71.161.207.15)
Comb filtering on a massive scale. .......
454: High Efficiency Speaker Asylum, RE: Oris horn colorations (0.00)
Posted by Bill Fitzmaurice on 2020-08-02, 05:54:00 (71.161.207.15)
Smooth that to 1/6 octave, which is as much resolution a you can hear, and it's not bad at all. If that was measured in room it's pretty good. .......
455: High Efficiency Speaker Asylum, RE: Upgrading inductor (0.00)
Posted by Bill Fitzmaurice on 2020-08-01, 05:36:11 (71.161.207.15)
It's not something I would do, as what it mainly results in is higher insertion loss. .......
456: High Efficiency Speaker Asylum, RE: Upgrading inductor (0.00)
Posted by Bill Fitzmaurice on 2020-07-31, 04:48:52 (71.161.207.15)
IME, which might be considered extensive, DCR is the only major factor where different inductors are concerned. To a far less extent capacitance would be as well, but lower DCR also tends to result in .......
457: High Efficiency Speaker Asylum, RE: You're probably right (0.00)
Posted by Bill Fitzmaurice on 2020-07-27, 12:39:56 (71.161.204.227)
Visually, maybe, but music is almost always dubbed in during post-production. Even if real they were probably never even plugged in, let alone used. .......
458: High Efficiency Speaker Asylum, RE: Any good sounding L-pads? (0.00)
Posted by Bill Fitzmaurice on 2020-07-17, 11:11:20 (71.161.204.227)
LPads are purely resistive, they don't audibly affect the sound. .......
459: High Efficiency Speaker Asylum, RE: Crossover Resistor Value (0.00)
Posted by Bill Fitzmaurice on 2020-07-16, 11:21:36 (71.161.204.227)
You should be using an LPad, not a pot. A pot cannot present the crossover with the load it should see to function correctly. .......
460: High Efficiency Speaker Asylum, RE: A Simple Question I don't Know The Answer To! (0.00)
Posted by Bill Fitzmaurice on 2020-07-06, 12:00:55 (71.161.202.62)
It may not cause any problem at all. However, tube amps in general don't care for running a higher impedance load than the tap rating, and aren't particularly bothered by running a lower impedance loa .......
461: High Efficiency Speaker Asylum, RE: Swear Bruce told me to put the wheels back on my Edgar Titan Horns... (0.00)
Posted by Bill Fitzmaurice on 2020-06-23, 12:46:28 (71.161.202.62)
As an engineer who does this for a living I know that anything that can be heard can be measured, but by no means can everything that can be measured also be heard. If there's an adage that applies it .......
462: High Efficiency Speaker Asylum, RE: If you're ever in Northern New Mexico.... (0.00)
Posted by Bill Fitzmaurice on 2020-06-22, 04:50:35 (71.161.202.62)
It's not like test equipment is expensive. I assume you have a PC, unless you use a phone to post. Software is free, HolmImpulse and REW being just two examples. All that leaves is a USB mic, like thi .......
463: High Efficiency Speaker Asylum, RE: Swear Bruce told me to put the wheels back on my Edgar Titan Horns... (0.00)
Posted by Bill Fitzmaurice on 2020-06-21, 18:53:52 (71.161.202.62)
That would only be a valid test if you were blindfolded while someone else lifted them and lowered them and you were unaware of when they were lifted and when they were not. But measurements don't lie .......
464: High Efficiency Speaker Asylum, RE: Can you explain to me... (0.00)
Posted by Bill Fitzmaurice on 2020-06-18, 10:56:13 (71.168.104.47)
Seeing a response chart with and without the pucks it would be very obvious what's happening, if anything. I've measured my speakers on the floor, on spikes and on foam blocks. There was no difference .......
465: High Efficiency Speaker Asylum, RE: Front horns: FR cone vs. comp driver (0.00)
Posted by Bill Fitzmaurice on 2020-06-17, 18:22:15 (71.168.104.47)
Not always. High Qes drivers don't have both rising response and a serious deficiency in response in the power region. Low Qes drivers do. .......
466: High Efficiency Speaker Asylum, RE: Oris horn colorations (0.00)
Posted by Bill Fitzmaurice on 2020-06-16, 18:41:37 (71.168.104.47)
If you can hear it you can measure it. What does your response look like? .......
467: High Efficiency Speaker Asylum, RE: Front horns: FR cone vs. comp driver (0.00)
Posted by Bill Fitzmaurice on 2020-06-11, 05:25:40 (71.168.104.47)
It goes more than a long way in explaining it. You don't even need to compare different horns to see the low pass effect when there is a throat chamber. Take a standard direct radiator, put a restrict .......
468: High Efficiency Speaker Asylum, RE: Front horns: FR cone vs. comp driver (0.00)
Posted by Bill Fitzmaurice on 2020-06-10, 09:48:42 (71.168.104.47)
Strictly speaking that's a waveguide, as the throat is larger than the cone. With a full range driver that's a good thing, as I previously posted below. .......
469: High Efficiency Speaker Asylum, RE: Front horns: FR cone vs. comp driver (0.00)
Posted by Bill Fitzmaurice on 2020-06-04, 19:20:10 (71.168.104.47)
That's an example of a horn that doesn't have a throat chamber, so there will be little to no bandpass effect. It will work best with a low Q driver, which at 0.27 the TB is. In a direct radiating ali .......
470: High Efficiency Speaker Asylum, RE: When does tweeter "waveguide" become horn bandpass device? (0.00)
Posted by Bill Fitzmaurice on 2020-06-03, 12:09:43 (71.168.104.47)
Any time you have a chamber between the diaphragm and horn throat that chamber is a low pass filter, making the horn a bandpass. One of the functions of horn phase plugs is to minimize the size of the .......
471: High Efficiency Speaker Asylum, RE: Front horns: FR cone vs. comp driver (0.00)
Posted by Bill Fitzmaurice on 2020-06-03, 08:10:44 (71.168.104.47)
The reason why you ran into this problem is that horns are bandpass devices. If you take a driver that has flat response in a direct radiating alignment and put it onto a horn there will be positive g .......
472: High Efficiency Speaker Asylum, RE: OPEN BAFFLE ARE NOT HIGH EFFICIENCY (0.00)
Posted by Bill Fitzmaurice on 2020-05-19, 09:29:48 (71.161.204.213)
That would be confirmed or refuted by seeing SPL charts. It's easy to claim high sensitivity, another to prove it. .......
473: High Efficiency Speaker Asylum, RE: OPEN BAFFLE ARE NOT HIGH EFFICIENCY (0.00)
Posted by Bill Fitzmaurice on 2020-05-16, 07:03:54 (71.161.204.213)
True, but you'll fight a losing battle trying to convince open baffle fans of it. .......
474: High Efficiency Speaker Asylum, RE: Western electric driver clones (0.00)
Posted by Bill Fitzmaurice on 2020-05-10, 05:47:15 (71.161.204.213)
Question: Would you rather drive a 1928 Ford or a 2020 Toyota? That's the comparison between old WE and modern drivers. It's true that a very long horn won't have reasonably flat response over a wide .......
475: High Efficiency Speaker Asylum, RE: Durable Drivers (0.00)
Posted by Bill Fitzmaurice on 2020-05-09, 05:52:50 (71.161.204.213)
Also, it's a really bad idea to use an email address as a username. Bots cruise the web looking for email addresses to bombard with spam. .......
476: High Efficiency Speaker Asylum, RE: Durable Drivers (0.00)
Posted by Bill Fitzmaurice on 2020-05-08, 19:14:17 (71.161.204.213)
You'll have much better luck starting a new thread in the regular speaker section instead of tagging onto a five year old thread totally unrelated to your question. .......
477: High Efficiency Speaker Asylum, RE: What is Mid-sized To You? (0.00)
Posted by Bill Fitzmaurice on 2020-04-30, 11:43:16 (71.161.204.213)
He must use a lot of pixie dust to overcome comb filtering with that tweeter array too. .......
478: High Efficiency Speaker Asylum, RE: Le Cleac'h spreadsheet (0.00)
Posted by Bill Fitzmaurice on 2020-04-23, 09:02:58 (71.161.204.213)
Jean-Michel himself recommended HornResp in 2007, and it's been vastly improved since then. .......
479: High Efficiency Speaker Asylum, RE: Acoustic Technologies Inbound (0.00)
Posted by Bill Fitzmaurice on 2020-04-23, 05:46:32 (71.161.204.213)
http://www.tb-speaker.com/en/products/w3-1335sb Put a $40 driver into a nice looking box and sell it for $1250. I love this country! .......
480: High Efficiency Speaker Asylum, RE: EV/JBL/KEF System Owned By Alfred F. Cox (Ampeg) (0.00)
Posted by Bill Fitzmaurice on 2020-04-11, 19:16:24 (71.161.204.213)
It's not much better, xmax is even shorter at 2.3mm, and the $4400 price is absurd. A horn loaded sub of only 18 cu ft will smoke either of them big time. .......
481: High Efficiency Speaker Asylum, RE: looks to me like there are issues with both MR and HF XOs (?) nt (0.00)
Posted by Bill Fitzmaurice on 2020-04-11, 19:10:43 (71.161.204.213)
If it's by design it's a bad design. There's no justification for it, or a logical reason for high distortion. I know what Paul Klipsch would have said about it. .......
482: High Efficiency Speaker Asylum, RE: EV/JBL/KEF System Owned By Alfred F. Cox (Ampeg) (0.00)
Posted by Bill Fitzmaurice on 2020-04-09, 20:03:32 (71.161.204.213)
It's been well documented many times that the EV 30 just wasn't a good driver. One shortcoming was the use of polystyrene foam for the cone, another was that the frame was far too weak to handle the w .......
483: High Efficiency Speaker Asylum, RE: EV/JBL/KEF System Owned By Alfred F. Cox (Ampeg) (0.00)
Posted by Bill Fitzmaurice on 2020-04-08, 08:46:28 (71.161.204.213)
I wouldn't get all that excited about that. The 30" EV woofer was the biggest failure they ever produced. .......
484: High Efficiency Speaker Asylum, RE: looks to me like there are issues with both MR and HF XOs (?) nt (0.00)
Posted by Bill Fitzmaurice on 2020-04-08, 06:10:09 (71.161.204.213)
I agree, the response dips show something isn't right. The distortion doesn't look good, but the response looks worse. .......
485: High Efficiency Speaker Asylum, RE: FH1 woofers (0.00)
Posted by Bill Fitzmaurice on 2020-03-28, 06:17:54 (71.161.204.213)
The only way to know is via modeling in HornResp, which requires the specs of the enclosure, and those of the K33 as well. But as far as 'detail' is concerned, that tends not to be a midbass trait. :: .......
486: High Efficiency Speaker Asylum, RE: Klipschorns and La Scala's MUST suck at voices because....Really this is a bi-amp question. ;) (0.00)
Posted by Bill Fitzmaurice on 2020-03-26, 09:25:46 (71.161.204.213)
If there are advantages to tubes, and that's highly debatable, they occur above the woofer pass band. The advantage to bi-amping is it allows use of a very low powered tube amp for the mids and highs, .......
487: High Efficiency Speaker Asylum, RE: Why ? (0.00)
Posted by Bill Fitzmaurice on 2020-03-18, 05:06:45 (71.161.204.213)
One can buy Wilsons that sound bad and look worse for a lot more, but the point is one can find speakers that sound very good for a lot less. .......
488: High Efficiency Speaker Asylum, RE: Nice Tannoy speakers in NYC (0.00)
Posted by Bill Fitzmaurice on 2020-03-17, 14:33:41 (71.161.204.213)
We have different definitions of 'poor man'. .......
489: High Efficiency Speaker Asylum, RE: --------- Some...Jbl 2220 (0.00)
Posted by Bill Fitzmaurice on 2020-03-16, 14:18:03 (71.161.204.213)
A7s are front loaded horns. The main difference between them and the 4560 is the size of the ported rear chamber. .......
490: High Efficiency Speaker Asylum, RE: --------- Some...Jbl woofers for 4560 cabinet (0.00)
Posted by Bill Fitzmaurice on 2020-03-16, 14:15:54 (71.161.204.213)
There's no direct correlation between the response of drivers in a closed box and in a horn, or even in a reflex box for that matter. .......
491: High Efficiency Speaker Asylum, RE: Jbl woofers for 4560 cabinet (0.00)
Posted by Bill Fitzmaurice on 2020-03-16, 10:34:24 (71.161.204.213)
Well, you can learn how to use software to choose the best driver for a particular job, or you can do what you're doing now, which is essentially the same as throwing darts...in the dark...while blind .......
492: High Efficiency Speaker Asylum, RE: Jbl woofers for 4560 cabinet (0.00)
Posted by Bill Fitzmaurice on 2020-03-15, 14:33:32 (71.161.204.213)
That's because JBL would have loaded it with whatever was its latest driver choice as the years went by. It will work totally different with a 130 versus 2227. Only by software modeling can you know w .......
493: High Efficiency Speaker Asylum, RE: Subwoofer for Klipschron AK6 1502 or 1802 (0.00)
Posted by Bill Fitzmaurice on 2020-03-14, 11:28:19 (71.161.204.213)
I wouldn't say nuts, but loading a horn with two woofers doesn't give you 6dB more sensitivity. Using two identical horns gives you 6dB more sensitivity, or using two woofers in a horn while doubling .......
494: High Efficiency Speaker Asylum, RE: Jbl woofers for 4560 cabinet (0.00)
Posted by Bill Fitzmaurice on 2020-03-14, 10:09:32 (71.161.204.213)
Considering that you're mainly dealing with vintage JBL drivers that are long out of production, or newer driver models that you can't get specs for nor buy, you're best off to use HornResp to model i .......
495: High Efficiency Speaker Asylum, RE: Seriously?! (0.00)
Posted by Bill Fitzmaurice on 2020-03-13, 12:56:39 (71.161.204.213)
Yep, and I explained there why a coaxial woofer wasn't a good candidate for horn loading. BMS 4590s are entirely different. .......
496: High Efficiency Speaker Asylum, RE: Seriously?! (0.00)
Posted by Bill Fitzmaurice on 2020-03-13, 08:49:32 (71.161.204.213)
I don't recall saying that. Coax woofers tend to not work well in straight horns, especially mine, as they have phase plugs. For information about room treatments and much, much more google 'Ethan Win .......
497: High Efficiency Speaker Asylum, RE: Seriously?! (0.00)
Posted by Bill Fitzmaurice on 2020-03-13, 06:37:14 (71.161.204.213)
One doesn't have to speculate. Model it in HornResp, which has efficiency percentage charting as well as SPL. When you do that you'll see that the highest efficiency of a reflex box is where the secon .......
498: High Efficiency Speaker Asylum, RE: Subwoofer for Klipschron AK6 (0.00)
Posted by Bill Fitzmaurice on 2020-03-09, 05:55:19 (71.161.204.213)
A Sonotube doesn't have 105dB/w sensitivity at 25Hz. .......
499: High Efficiency Speaker Asylum, RE: Midrange horn baffle and crossover (0.00)
Posted by Bill Fitzmaurice on 2020-02-27, 08:25:00 (71.161.204.213)
The effect on the tweeter will be significant, as the baffle is large compared to the wavelengths it produces. It's not so large compared to the wavelengths that the mid horn produces, so it's far les .......
500: High Efficiency Speaker Asylum, RE: Midrange horn baffle and crossover (0.00)
Posted by Bill Fitzmaurice on 2020-02-05, 05:39:56 (71.168.92.27)
There's no reason not to go to 400Hz with that horn, it has plenty of length and mouth area to go that low. You might get a bit better polar response in the low end with a baffle, but based on the EV .......
Found total of 500 records, Query: , Author: Bill Fitzmaurice in All Forums, Time: 2 sec.