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Old 22nd September 2007, 06:21 AM   #1
mhtplsh is offline mhtplsh  India
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Default horn subwoofer design help

I saw this subwoofer on www.cowanaudio.com.
William Cowan hv used two 10" subwoofers.
I hv some question about this design.
The area of cutout in the plywood on which the driver is fitted is to be included in the sd or not?
If i use single 8" or 10" speaker, can i reduce width i.e. 560 mm by half or not?
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Old 22nd September 2007, 02:03 PM   #2
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hey are you taking about the Unity Horn Speakers there ot the tapped ??
BTW where di u manage to get a driver for horn enclosure in pune???
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Old 22nd September 2007, 06:05 PM   #3
mhtplsh is offline mhtplsh  India
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I forget to attach the picture.
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Old 24th September 2007, 11:03 AM   #4
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Hey hi, 8" and 10" drivers would have a diffrent piston area
piston area is directly proportional to the mouth area
an aproximation of Sd(pistion area)would be
8" = 64
10"= 100
so if you use 8inch instead of 10inch u can reduce mouth to 0.64 of orignal length
for exact calculation use piston area mentioned in the driver datasheet
Sd (8inch driver) / (mouth area on 8inch) = Sd (10inch driver) / (mouth area on 10inch)
i think this should work
also the length of the horn would reduce a little, there is another calculation for that.. but that would be a minor issue u can use the same length if u want thats gonna giv u a better spl

any suggestions guyz



PS : i also reside in pune btw, can u tell me any shops here where i can buy nice drivers
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Old 27th September 2007, 07:14 AM   #5
hm is offline hm  Europe
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Hello,

whats about this smaller BL solution:

The ALPHORN, 135 L, 3,1 m, 27 Hz -6 dB

made for 6,5-8"
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Old 27th September 2007, 07:30 AM   #6
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Download Hornresp and model whatever you want to do. Reasonably deep bass in room from a horn requires a lot of space.
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Old 27th September 2007, 07:43 AM   #7
hm is offline hm  Europe
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Hi,
I use AJ horn until 2004

do you read:
http://www.hm-moreart.de/13.htm

http://www.hm-moreart.de/61.htm
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Old 28th September 2007, 03:45 AM   #8
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Quote:
Originally posted by Amit_112dB
Hey hi, 8" and 10" drivers would have a diffrent piston area
piston area is directly proportional to the mouth area
so if you use 8inch instead of 10inch u can reduce mouth to 0.64 of orignal length
i am sorry i was wrong here, i had a talk with martin MJ king(www.quarter-wave.com)
Sd or speaker diameter has nothing to do with the mouth size
8inch and 10inch drivers will have same mouth size
mouth size is only related to lowest freq. produced nothing to do with Sd
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Old 30th September 2007, 10:09 AM   #9
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True. Note too that most domestic horns are trunkated, with a reduced mouth CSA, and rely on QW action and / or corner / rear-wall loading, so you can go lower for a given mouth size (as per Will's linked to above). If possible, I'd always front-load, like that one, or a TD style tapped cabinet. Naturally tight passband & excellent driver control.
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