2 cubic feet for both subs combined, but I can be a little bigger, because 1 cubic foot per sub is Kickers Min. With the dementions you listed, the box would be about 2.51 cubic feet.
FYOI, the formula for figuring box volume with angles is
(H x W x (TD+BD)/1728)/2
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1987 Buick T-type
1998 HD Electra Elide
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