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Basic geometry, man - length x width x heght, divide by 1728 (that's the number of cubic incehes in a cubic foot). You now know the approximate volume, in cubic feet, of your enclosure. You need to check the woofers info to know what size they recomend - most twelves want between 1 and 2 cubic feet sealed, between 1.5 and 3.5 ported. The box you describe around four to five cubic feet total - that's a big box! Probably some good high powered woofers and a couple ports, and it'll rip your head off.
For further info, please start a new thread, though....
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