Hi. I'm looking for some advice on a sub box build. I plan to build a sealed box to fit in the hatch area of an 80 Corvette with 4 Alpine S-W10D4 DVC subs. The enclosure will be about 35" wide, 13"tall, 13" deep. Power will come from 1000W monoblock @ 2ohms. Airspace does not seem to be an...