Can someone help me model a horn for a driver in my basement? - diyAudio
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Old 23rd January 2011, 11:36 PM   #1
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Default Can someone help me model a horn for a driver in my basement?

I have two drivers in my basement, and I'd like to use one or the other in a horn sub. My computer (sadly) can't run HornResp, and Akabak seems to be quite beyond me. Any suggestions?
1. Audiopulse Epic 12
DISCONTINUED Audiopulse EPD412 EPIC 12" DVC Subwoofer 4 Ohm | Parts-Express.com
2. Stryke (Acoustic Elegance) SB-12

Fs:21hz
Qts: 0.557
Vas: 160 liters
Vd: 742 cc
Bl: 10.2
Sensitivity: 89dB @ 2.83v
Nominal impedance: 6 ohms
Xmax:14mm (1-way)
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Old 25th January 2011, 03:19 AM   #2
tb46 is offline tb46  United States
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Hi,

There is not enough data for the AES SB-12 in your post. The Qts looks on the high side for a horn, and the Bl is on the low side. I took a look at the EPIC, it is not only discontinued, its T/S Parameters do not calculate correctly in Hornresp, anyway I build you a model for a 300 Liter tapped horn, maybe that'll get us started:

Regards,
Attached Images
File Type: jpg EPIC_12_in_Input_SPL_small.jpg (84.1 KB, 184 views)
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Last edited by tb46; 25th January 2011 at 03:27 AM.
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Old 25th January 2011, 08:02 AM   #3
GM is online now GM  United States
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WinISD driver file: Stryke Audio SAL-SB12.wdr

GM
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File Type: gif WinISD SAL-SB12 driver file.gif (14.2 KB, 173 views)
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Old 28th January 2011, 09:38 PM   #4
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Just being practical: For the amount of effort it takes to actually fabricate a decent horn, I wouldn't waste time working with an inferior horn/driver combination. That being said, I'll take GM's data and see what I can come up with.
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Old 28th January 2011, 10:05 PM   #5
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Default pics and ideas

Here's what I came up with without going overboard on time:
Attached Images
File Type: png schematic.PNG (16.6 KB, 132 views)
File Type: png SPL response.PNG (24.4 KB, 131 views)
File Type: png impulse resp.PNG (16.2 KB, 130 views)
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Old 28th January 2011, 10:08 PM   #6
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The horn was designed to be corner loaded. My experience with Hornresp is that it's very conservative. I have no trouble getting into the first octave, though Hornresp suggests the roll off is 35hz. YMMV.
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Old 28th January 2011, 10:14 PM   #7
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Ooops, forgot the most important:
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Old 29th January 2011, 06:41 PM   #8
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Quote:
Originally Posted by tb46 View Post
Hi,

There is not enough data for the AES SB-12 in your post. The Qts looks on the high side for a horn, and the Bl is on the low side. I took a look at the EPIC, it is not only discontinued, its T/S Parameters do not calculate correctly in Hornresp, anyway I build you a model for a 300 Liter tapped horn, maybe that'll get us started:

Regards,
Hmm. Thanks for the thoughts - I've seen some fairly similar drivers used in horns, but I guess these aren't so usable.

Plan B is just to build some enormous ported boxes. 20hz, here I come!
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Old 29th January 2011, 11:42 PM   #9
tb46 is offline tb46  United States
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Hi,

For your plan B you are looking at: BR - 117 ltr.net - 2 ports 4"Dia.x 20"long - for the EPD412, but it will not give you the same impact as a tapped horn (which is 2.5 times as large); and the volume is larger than Vas, which some people recommend against (impulse response looks fine in Hornresp though).

Regards,
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Old 29th January 2011, 11:45 PM   #10
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Quote:
Originally Posted by Spasticteapot View Post
Hmm. Thanks for the thoughts - I've seen some fairly similar drivers used in horns, but I guess these aren't so usable.

Plan B is just to build some enormous ported boxes. 20hz, here I come!
They're not horrible, just not the best. If you're in the mood to experiment, then build yourself a horn and have fun. If you want to play it safe, build some bass reflex boxes. Heck, what fun is it to play it safe? It is a lot of work to build a good folded horn, but you certainly have something to be proud of afterwards.

Did you say you have two of those subs? A pair of 12" drivers in a folded horn generally model better than one. Do you want me to continue with the modeling?

John
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