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15" Subwoofer recommendations - Page 2

post #31 of 36
1/28/08 at 5:35am

Re: 15" Subwoofer recommendations

Assuming that after you add more bracing, the net enclosure size is 42cf after additional bracing and ports, then a pair of 8" ports, 32" long would give you an Fb of 13hz. Most use longer ports and trim them down as required.

-Robert
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post #32 of 36
1/28/08 at 2:12pm
Thread Starter 

Re: 15" Subwoofer recommendations

Ok, so you think I should trim the ports to 32". Any other suggestions before I close it up?

Thanks,
Bud
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post #33 of 36
1/28/08 at 3:19pm

Re: 15" Subwoofer recommendations

Just the additional MDF that Steve suggested.

And the port length of 32" is based on an internal port diameter of 8". If it is not exactly 8", then we need to make adjustments. If you bought an 8" Quicrete tube, they all are not the same size.

-Robert
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post #34 of 36
1/28/08 at 5:29pm
Thread Starter 

Re: 15" Subwoofer recommendations

The Quikcrete tube is acutally 8.25" on the ID.

Thanks,
Bud
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post #35 of 36
1/28/08 at 7:26pm

Re: 15" Subwoofer recommendations

Then using the full 36" ports will tune your box to 12.65hz. That small difference is not enough to worry about actually trimming down the ports.

-Robert
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post #36 of 36
1/28/08 at 7:28pm
Thread Starter 

Re: 15" Subwoofer recommendations

Thanks for all of your time and effort to help me!!!!
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