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If you're going with weird shape multi-subs boxes or boxes with subs on different sides of boxes you'll end up with subs that deconstructively interfeir with eachother. Maybe not as much as 180 degree out of phase but a few degrees depending on what hz. To build a multisub box and get it to sound as loud as possible, you have to understand wavelength, tranfer function, Thiele-Small parameters of the subs and how to construct a box. a loud box is a simple box, sealed, subs side by side, facing up or down or back of the vehicle. If you're building a single sub box, then it'll sound good no matter what you do b/c you don't have the second sub to interfier with eachother. If you look at all the prebuilt car specific boxes from JL and MTX (they did their homework) most of them are single sub boxes. If it's a 2 subs boxes, both subs are on the same side of the box. If you look at SPL vehicles at the db drags, they have flat walls of subs or subs that have equal distance tween them and the windshield. It took Gate's bronco 64 10" subs to hit 171db with different sub to windshield distances on all the subs and JL's Metro with 4 15's with equal subs to windshield distance to hit the same SPL.
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NEW complete and updated My project with 100+ pics on 7-4-03
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