okay.....

If I build a box that is (W=18" x L=35" x D=24") with a port that is (W=5" x L = 14" x D = 11") my calculations say that I will have a 5 cubic foot box (with a little left over for displacement of the sub basket) that is tuned to 52hz. If anyone knows how to check my work, I'd really appreciate a second or third opinion......I simply don't trust my math skills.