Ok, here is the question for all you diehard audio people on the forum, how big does it need to be. I have a pair of JL 12 inch subs, forget the exact model (got cheap, see a previous post) and I am making a custom box for them. The idea is one is in there normally, and the other is inverted (supposed to give better sound, right?). I looked up the manual online, and it said 1.5 cubic feet for the box volume for one. So what would I need for one normal, and one inverted? I have a really killer design in mind, and can't wait to build it, just need the figures to do the math. I am only designing it, than a freind is cutting all the materials and his friend (who makes alot of boxes) is building it. Should be HQ, just wish I could afford fiber glass instead :?