so here is the deal. gonne be building a box for my alpine swr-1241D, and i'd like it to be ported. i'm gonna be inverting the sub between the 2 bucket seats in my '86 toyota reg cab pickup, and was wondering how far the cone should be away from the port. i mean...i know far enough so the sub won't throw the cone into the port, but is it gonna make a difference if it is roughtly 4 inches away from the port?