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Throat size/VRC combinations for bass horns

Posted by PK (A) on December 28, 2003 at 06:39:46

I am trying to model a 55 Hz mid-bass horn to cover the frequency area between 60 and 180 Hz from were an Oris 150/AER combo will take over (A large mono sub horn will be used below 60 Hz).

The driver for the mid-bass horn is a 15” PD158 from Precision Devises (se T/S parameters below).

Now to the question: I am confused about which throat size/back chamber (VRC) combination I should use. Using McBeas HornsResp I get almost identical predicted responses from either (a) throat = 190 cm2 and VRC = 12 liter, or (b) throat = 300 cm2 and VRC = 25 liters.

1. Which throat size/VRC combo would be best, and
2. How would the two combinations differ soundwize?

The horn will be a 180 cm long, hyp/exp t = 0.6, quarter space, and the mouth will be about 6000 cm2 big.

T/S parameters for PD158:

Fs= 39.85 Hz
Qts= 0.205
Qes= 0.215
Mms= 107.905 grams
BL= 27.35
Qms= 6.935
Cms= 148μM/N

Thanks!

Regards
Peter K.

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