with those dimensions he'd have a little over 3.5 net cubic feet (not counting the sub displacement...just the wood...assuming you use 3/4" mdf). You'd have plenty of room to have a sealed or ported box. After subtracting out the port volume that would leave you with a 2.95cf box. A tuning frequency of 33 hz would yield a 6" long by 6" high square port that is 25" deep (you'd have to make a turn since your box isn't deep enough to have it go straight). You can adjust the length and width of the port...but that will change the depth of the port in order to keep the same tuning frequency. Generally the smaller the port the shorter the depth. If you went with a 16 sq. in. port the depth would only have to be 10". You need to be careful about going so small though because of wind noise and other adverse affects it has on the sq.
PS....my last L7's were each in a 2.88 cf box (5.76 total) with a 36 sq in. port (72 total) tuned to 38 hz. It was very loud, but if I had it to do over again I would've tuned it a little lower, between 30 and 35.
PS....my last L7's were each in a 2.88 cf box (5.76 total) with a 36 sq in. port (72 total) tuned to 38 hz. It was very loud, but if I had it to do over again I would've tuned it a little lower, between 30 and 35.
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