Need someone to give me a design I don't have computer to do so ...i have two 15" eartrquake tremor x and 4000 watt amp - box dimensions, 44" W x 24"D x 20" H .... "Could be a little more depth " subs up port back tuned to 33hz. I want the port on bottom across box like 40" wide ..sepreate chambers ." But open on bottom to both on port if that makes sense ......so it sepeate chambers but one port .any advice will help thanks ......by the way there going in a Ford explorer