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RE: How do I guess at compression ratio and rear chamber volume for lower mid horn?

Posted by PK (A) on August 28, 2010 at 01:57:20

In Reply to: RE: How do I guess at compression ratio and rear chamber volume for lower mid horn? posted by b. on August 27, 2010 at 18:43:28:

Hi b,

I would use a larger throat than 49 cm2. Actually, I would use one quite close to the SD of the driver in order to avoid the sound bouncing back and forth between the cone and the baclside of the throat. I know that John Hasquin (JLH) is using the Faital with a 4" throat (81 cm2) in a 142 Hz tractrix horn with great success, so this is what I would use in your case.

Like djk recommends, you can use HornResp to get the back chamber right. The rule of thump is to use a size of a back chamber that - on the given horn, and with the given driver - results in an impedance peak just below the desired Fc (in your case around 245 Hz or so).

However, you may find that this compo will be excellent in the 200-1500 Hz range. So I will encourage you to make a back chamber slightly bigger than you may need it and then just fill it up until you reach the dsired peak.

Best regards
Peter

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