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ok, first things first, I have learned that subs usually sound much better when they face the rear of the car. I have always used 3/4 inch particle board for my boxes and have always been pleased with the sound. The biggest thing to remember is to make sure that the cubic feet are as close to what they recommend as possible, and that the boxes are sealed well. A bead of silicone on all joints works well. As far as securing them, you can either use velcro, or for something more permanent, just screw them down with small screws.
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