plans for a FI BL 15" ported box

I had a 3.5 for my 15 managed a 142 tuned to 37. I sold it to AQHDC3 while he gets his 4 18s together, might ask him when he'll be done with it.

(I specified 4cuft @ 35, but after construction and measuring the internal volume and checking the actual measurments against the tuning formula and other calculators it came out to be about 3.57 @ 37)

My old setup - http://s83.photobucket.com/albums/j301/Sevening7/BL%20Install/

You can also try http://www.subwoofertools.net that's all I used for my design.

 
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