I need some box design help please!! Im gonna get 2 e15a with a Tsunami 1800 and i was gonna build 2 ported boxes of eD's site but they will not fit width wise. The back of my truck measures 41"W x 31.5"D x 22"H and I dont know what the volume is or what the port area is none of that I just want something like 4.4 cuft divided by 2 so 2.2cuft per chamber and tuned to around 30Hz please need help. Blueprints would be really nice! Please help thanx in advance.