Hi all, im new to the forum and i'm trying to get the dimensions right so that i can build a sub enclosure for my new db124 12" sub. The website specifies overall external dimensions of 15" x 17" x 10- 1/16", however, when i subtract 1.5" off each dimension to ascertain the internal dimensions, the calculation for the internal volume leaves me with 1.03 cubic feet. ie 13,5" x 15.5" x 8.56" = 1791.18, divided by 1728 = 1.0365 cubic feet. are the specs on the website incorrect or am i doing something wrong? I have the opportunity to purchase a 1 cubic foot sealed enclosure but i'm not sure how well the sub will perform in it. Any thoughts?