horn subwoofer design help

mhtplsh · 22nd September 2007, 06:21 AM

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?

Amit_112dB · 22nd September 2007, 02:03 PM

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???

mhtplsh · 22nd September 2007, 06:05 PM

I forget to attach the picture.

Amit_112dB · 24th September 2007, 11:03 AM

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

hm · 27th September 2007, 07:14 AM

Hello,

what´s about this smaller BL solution:

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

made for 6,5-8"

Brett · 27th September 2007, 07:30 AM

Download Hornresp and model whatever you want to do. Reasonably deep bass in room from a horn requires a lot of space.

hm · 27th September 2007, 07:43 AM

Hi,
I use AJ horn until 2004

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

http://www.hm-moreart.de/61.htm

Amit_112dB · 28th September 2007, 03:45 AM

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

Scottmoose · 30th September 2007, 10:09 AM

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.

22nd September 2007, 06:21 AM	#1
mhtplsh diyAudio Member Join Date: Aug 2007	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?

27th September 2007, 07:43 AM	#7
hm diyAudio Member Join Date: Feb 2004 Location: near Hamburg Germany	Hi, I use AJ horn until 2004 do you read: http://www.hm-moreart.de/13.htm http://www.hm-moreart.de/61.htm __________________ http://www.hm-moreart.de

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22nd September 2007, 02:03 PM	#2
Amit_112dB diyAudio Member Join Date: Jul 2007	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???

24th September 2007, 11:03 AM	#4
Amit_112dB diyAudio Member Join Date: Jul 2007	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

27th September 2007, 07:30 AM	#6
Brett diyAudio Member Join Date: Jan 2002	Download Hornresp and model whatever you want to do. Reasonably deep bass in room from a horn requires a lot of space.

30th September 2007, 10:09 AM	#9
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	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.