I have a 15" awt15x and the box im building is 4.0 cubes tuned down real low to 26-27 hz. The dimensions are 19 tall X 19 deep by 36 wide. The the airspace in the box is really on 24 inches wide but the 3" port elbows 3 times and takes up the other 12 inches wide (2.5 cubic feet port displacement....crazy) anyways, i was wondering where i should drill the cutout for my sub? should it pe in the middle of the 24" section of airspace, or should it be offcenter a little opposite the port side? THanks for the input.