AQ HDC3 ported box recomendations.

[skmfkr 5,000+ posts]

do a 6 cubic foot box with a port that has a 96 sq" opening x 16" long. That will tune to 40hz, which is what AQ subs should be tuned to. Whatever you do dont tune the box low. These subs lose a lot of frequency response if they aren't properly tuned in my opinion.

im considering 6cubes at 40hz this spring with 102 square inches of port and 17inches long