Is my box creating a null?? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 4 Old 06-10-2011, 04:47 PM - Thread Starter
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I just completed a box with two custom built PSI 18's from 13av.2 motors. The box is 91" H x 24" W x 13" D. I have 110db+ from 10hz-55hz but then drop down to 80db from 55hz-90hz. Should I stuff the cab with polyfil to break up standing waves or come up with a different idea? Or could the subs be the problem and not the box?
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post #2 of 4 Old 06-10-2011, 04:58 PM
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Is the sub at the "end" of the enclosure. 91" puts the centre of the sub about 2m from the bottom. That's close to the half wavelength of 90hz. It's quite possible. Stuffing the cab would likely help.

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post #3 of 4 Old 06-10-2011, 07:06 PM
 
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Quote:
Originally Posted by tgse3 View Post

I just completed a box with two custom built PSI 18's from 13av.2 motors. The box is 91" H x 24" W x 13" D.

Picture worth thousand words. If you have the drivers too far apart that would be a problem, one that stuffing won't fix. Can't say for sure without seeing it. The room/placement could also be an issue.
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post #4 of 4 Old 06-10-2011, 07:56 PM
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Correction, if it's in the middle of the box it would be a half wave.

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