Currently I have a 177L 15" Tempest Sonosub (24" x 36") with 2-17" flared ports and is powered by a 250w PE. Due to the up and coming redesign of the theater I cannot use this large sub. I need to build a box sub, more so, a rectangular one. The area it will go is under the rear futon. The area is roughly 6' long, 1' high and 3' deep. I'd like, if it's possible, to build a box to fit in this area and achieve the same base results. Is it possible?