I need input on a box for my LA Storm 15". It will be in a 4 door sedan powered by a 1500-2k amp (haven't decided yet). I was thinking of something like sub up port into the cabin (seats fold down) with a volume of about 3 cubes net tuned to 30 hz with 1 6" aero. Anybody think that would be a good box? The box dimensions will be 30" D x 21" W x 14" H.