|
Search of High Efficiency Speaker Asylum Enter your search criteria. Click here for tips on using our search |
For Sale Ads |
1: Re: Any experience with horn-loading a bass port? (8.41)
Posted by Bill Fitzmaurice on 2006-03-30, 12:56:16 (68.237.139.201)
Like any horn if it isn't long enough and doesn't have enough mouth area for the intended passband then it's not going to do much for you. I use a quasi-horn-loaded port on a couple of my designs, but .......
2: RE: "half horn" BVR - Stubby horn port reflex boxes (8.41)
Posted by Bill Fitzmaurice on 2016-08-21, 07:06:27 (71.168.98.162)
That's a classic case of alignment mis-identification. Tapering a port tapered doesn't make it a horn, it just makes it a tapered port. It will work somewhat better than a straight port, but only in t .......
3: RE: looks like Roy Delgado read your article (7.76)
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 .......
4: Boundary effects work both ways. (6.01)
Posted by Bill Fitzmaurice on 2003-11-18, 06:05:13 (152.163.252.5)
If the horn is firing away from the wall when the distance from the mouth to the wall and back again equals 1/2 wavelength you'll have a cancellation node; this is called Allison effect. Thus if you p .......
5: RE: Hornresp now handles tapped horn (5.53)
Posted by Bill Fitzmaurice on 2007-06-16, 07:38:15 (70.20.37.2)
Doing a tapped horn you just do a backhorn and leave both the front and rear chamber values at zero. It can get cranky about the number and type of segments, though, so follow the instructions. My Omn .......
6: You won't know 'til he shows us pics (5.35)
Posted by Bill Fitzmaurice on 2005-05-06, 05:59:42 (70.109.184.198)
The impedance curve shows a resonance at around 35Hz which is the fc of the horn and a resonance around 15Hz which is likely the system fb. If that's the case it's not reactance annuled. The upper res .......
7: The rear chamber is too small. (5.23)
Posted by Bill Fitzmaurice on 2003-11-27, 16:37:46 (205.188.208.9)
I'd try a 60 liter chamber, tuned to 70 Hz. That will give you a nice response spike around 75 Hz or so to bring the port SPL up to where the horn SPL is, and if you do have your port rear facing you' .......
8: Re: Nice pix (5.19)
Posted by Bill Fitzmaurice on 2005-05-08, 17:38:07 (70.109.174.179)
Yes, nice. Now that I can see the design it's quite different from that where I found it impossible to throat load reflex ports. In your case you have 'tapped' the horn by having signal enter it at tw .......
9: Re: James Novak - full technique described? (5.15)
Posted by Bill Fitzmaurice on 2003-05-09, 14:51:13 (205.188.208.9)
What heppened to it? I for one use it. You can tune the chamber one octave below the Fh as Novak suggests for SPL from the port the same as that of the horn and no dip or you can tune lower for less S .......
10: Re: Paging Bill F ;) (4.86)
Posted by Bill Fitzmaurice on 2006-10-29, 14:51:57 (68.237.143.112)
"Then what I am building resembles what you did in Speaker Builder years ago, when you had front-loaded horns with ports entering the throat." Perhaps, but that's nothing like Tom's tapped horn. Look .......
11: Re: I'd run a horn from 30 Hz to 220 Hz (4.65)
Posted by Bill Fitzmaurice on 2003-05-15, 05:11:51 (205.188.208.9)
If you can't go with a corner horn I'd still go folded. Delay problems are not a big deal- you do need to time align, but that can be accomplished very easily with placement, and electronics are not r .......
12: RE: Is it a good idea to use 4 fullrange divers for higher sensitivity (4.44)
Posted by Bill Fitzmaurice on 2008-08-06, 07:09:49 (70.16.200.195)
'Is it gona lose the fullrange advantages much (image soundstage tone)?' IME there is some loss of imaging with an array, but that's more than made up for by the effortless response. An array sounds .......
13: Re: prior art (4.23)
Posted by Bill Fitzmaurice on 2005-05-11, 10:32:52 (70.109.174.179)
'A problem with using a vented system combined with any significant acoustic loading is that the box / port resonance you are depending on is too greatly damped as soon as any significant acoustic res .......
14: Re: BP4 and BP6 - are they competitive with horns as subs in certain applications? <nt> (4.04)
Posted by Bill Fitzmaurice on 2002-11-04, 13:54:38 (205.188.208.104)
I’d only use this config if you needed a high efficiency narrow bandwidth sub- perhaps to cover only the bottommost octave in adjunct with an existing system that won’t cover down there.. All my ho .......
15: RE: anyone here got a ballpark hornresp approximation of the new Jubilee ? (3.93)
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 .......
16: Re: Horn drivers: 12" vs 18" (3.92)
Posted by Bill Fitzmaurice on 2004-02-05, 08:09:35 (205.188.208.9)
Walt, if there is one advantage to the larger driver it does lie in the reduced excursion required of it to reach a certain SPL, not in the ease with which it can go to xmax. It's actually easier for .......
17: Re: prior art (3.87)
Posted by Bill Fitzmaurice on 2005-05-09, 19:10:28 (70.109.174.179)
If memory serves the first time I injected a port output partway down the horn was in my MiniSnail, published in both Speaker Builder and my book 'Loudspeakers for Musicians'(1999), but I've used the .......
18: Re: Phase (3.80)
Posted by Bill Fitzmaurice on 2005-05-13, 05:52:23 (70.109.137.253)
It's an impedance chart that tells you what's going on. The vented rear chamber isn't really an extension of the horn. What happens is that there is a total system resonance, that resonance being cont .......
19: RE: Conceptual idea behind Karlson (3.79)
Posted by Bill Fitzmaurice on 2007-09-11, 15:22:27 (70.16.220.102)
"Consider me clueless." So was Karlson. It's a series tuned dual chamber reflex. But, since it predated both T/S and the entire notion of bandpass boxes by decades, based on the elliptical shape of th .......
20: RE: anyone here got a ballpark hornresp approximation of the new Jubilee ? (3.77)
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 .......
21: RE: one of the biggest leaps in bass horn tech - another patent (3.75)
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 .......
22: By and large it doesn't work on sub horns. (3.74)
Posted by Bill Fitzmaurice on 2004-05-23, 07:15:04 (64.12.116.9)
You can vent the rear chamber quite effectively with short mid-bass horns; the proceedure is similar to the pre-T/S method of tuning VBs. First you measure the box Fs(h), which is the horn/driver reso .......
23: Re: No stuffing below 100Hz (3.70)
Posted by Bill Fitzmaurice on 2005-11-21, 07:18:37 (70.109.186.4)
Direct radiators are a different animal. With those you're going to get Doppler distortion. Doppler creates harmonics of the original signal, and as such are midbass and higher and need to be damped s .......
24: Re: Bass guitar boxes - Road Warrior, downsized Karlson - what's cool? (3.52)
Posted by Bill Fitzmaurice on 2002-10-27, 07:11:24 (205.188.208.104)
If you want a bass/key/PA cabinet that gets phenomenal output from a very small package (20 inches cubed) and micro-bucks ($150 max) DR10a is it. It’s only drawback is that it is so low to the ground .......
25: All except the Vas. (3.45)
Posted by Bill Fitzmaurice on 2004-02-03, 17:09:52 (205.188.208.9)
It may work OK, perhaps even better than the original, but alteration of the port size/air mass, possibly by ducting alone, would be a must. Model the rear chamber on WinISD to see what works best for .......
26: RE: TQWP "reflectors"? (3.44)
Posted by Bill Fitzmaurice on 2010-02-17, 16:53:29 (70.16.207.103)
They're used to extend the bandwidth of the output of a horn, but in a TQWP the only output you want from the terminus is near the pipe frequency, much like the only output you want from the port of a .......
27: RE: VOTT Cabinet Efficiency Increase (3.42)
Posted by Bill Fitzmaurice on 2007-08-31, 08:43:28 (70.16.197.242)
"See a few pro woofers rated at 103 db without horn loading." Sure, at 2kHz. You can't go by the raw SPL rating, you must look at the SPL chart on the manufacturer data sheet. OTOH, there are quite a .......
28: Go for it. (3.39)
Posted by Bill Fitzmaurice on 2003-04-17, 04:37:55 (152.163.188.5)
You actually should be able to make a fairly good prediction of how they'll work. Use the McBean program for the horn, leaving out the rear chamber volume information, to see what the horn will do. Ig .......
29: RE: horn loading (3.27)
Posted by Bill Fitzmaurice on 2008-07-24, 06:00:13 (71.161.101.204)
" the system resonance of a t/l is about half an octave lower then the free air resonance of the driver used" Fp is not restricted to a specific frequency for a specific driver. "a ported box where bo .......
30: RE: horn loading (2.97)
Posted by Bill Fitzmaurice on 2008-07-22, 10:29:10 (71.161.101.204)
"But doesn't the rear loading of the driver change its frequency response which is then amplified via the front horn" No more so than with a reflex box on the rear wave. " sound that emerged from the .......
31: Re: What type of applicatrion? (2.91)
Posted by Bill Fitzmaurice on 2004-03-17, 07:51:45 (152.163.252.5)
While the JBLs are fine drivers, they were designed for musical instrument use, electric guitar in particular. As such in a vented box they aren't much good below 100 Hz, and they won't even go that l .......
32: Re: throat distortion an air displacement issue? Zene / iron (2.80)
Posted by Bill Fitzmaurice on 2006-07-21, 06:39:38 (64.222.180.120)
You're right, my wording was confusing, a smaller throat doesn't change the size of the front chamber, it just makes it seem that way. Think of it as a 4th order dual-chamber reflex, with the throat o .......
Found total of 32 records, Query: port +horn, Author: bill fitzmaurice in High Efficiency Speaker Asylum, Time: 0 sec.