Re: How do you design a horn for a compresion driver? - Jmmlc

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Re: How do you design a horn for a compresion driver?

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Posted by Jmmlc on February 24, 2005 at 01:59:47

In Reply to: How do you design a horn for a compresion driver? posted by Roger Hill on February 22, 2005 at 10:11:14:

Hello,

To begin to design compression driver + horn using Hornresp you could start from the T/S parameters of a small electrodynamical loudspeakers (not a compression driver) like the Focal 5V 323 by example if you want to design a low-mid compresssion driver:

SD = 87
CMS = 5.10E-04
MMD = 4.03
RE = 6.60
BL = 8.64
RMS = 0.95
LE = 0.50
ES = 2.83

Then you can design the compression chamber itself (taking in account the area of the diaphragm and its distance to the phase plug)
VTC = 25
ATC = 87
Then you have to calculate the throat area you need according to the compression ratio that will depend on the ratio between the active area of the diaphragm and the active area of the slots of the phase plug.

By example for a compression ratio around 10 in this example you can take
S1 = 9

Then you can design a horn:

S1 = 9
S2 = 6455.26
EXP = 300
F12 = 60

Finally you can design the rear chamber:
VRC = 2
LRC = 4
FR = 40
TAL = 0

then calculate... and optimize to your taste.

Well this is a first approximation, others software can give additionnal precision and can take more parameters (shape of the suspension gap...) like AKABAK

Also it exist finite elements software than are used by few manufacturers

Also even if the T/S parametres of that small loudspeaker can be helpfull to begin in designing a compression driver, a true compression driver will have different BL, CMS...

Best regards from Paris,

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Follow Ups Full Thread

Topic - How do you design a horn for a compresion driver? - Roger Hill 10:11:14 02/22/05 (18)

Re: How do you design a horn for a compresion driver? - Jmmlc 01:59:47 02/24/05 (1)

Thank you............... - Roger Hill 05:45:33 02/24/05 (0)

Re: How do you design a horn for a compresion driver? - John Sheerin 19:09:22 02/22/05 (10)

I still don't understand............... - Roger Hill 16:54:20 02/23/05 (0)

LeCleach - Torana 00:23:51 02/23/05 (8)

Re: LeCleach - Jmmlc 09:35:31 02/23/05 (1)

Re: LeCleach - Torana 10:36:50 02/27/05 (0)

Re: LeCleach - John Sheerin 08:30:44 02/23/05 (0)

Re: LeCleach - JLH 04:58:38 02/23/05 (4)

Re: LeCleach - Torana 10:36:44 02/27/05 (0)

Resonance of BMS 4590? - Rapid 07:53:52 02/24/05 (2)

Looks like it to me. - JLH 10:58:22 02/24/05 (1)

Oops... - Rapid 14:20:08 02/24/05 (0)

or even a compression driver? - Roger Hill 16:39:51 02/22/05 (4)

Re: or even a compression driver? - Paul Eizik 17:09:56 02/23/05 (3)

also,.......... - Roger Hill 05:55:53 02/24/05 (0)

Thanks, - Roger Hill 05:53:49 02/24/05 (0)

Wise words Paul. - JLH 04:50:48 02/24/05 (0)

Follow Ups

Re: How do you design a horn for a compresion driver? - Jmmlc 01:59:47 02/24/05 (1)

Thank you............... - Roger Hill 05:45:33 02/24/05 (0)

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