If you wanna build a wall type build, make a clamshell design. In sealed boxes. Bout 1-1.25 cu. per. With that many subs if you do it right it'll slam. It's a 4th order. A sealed box firing into a ported chamber.
Planet Audio BB 2400.1. It's the Older Big bang series. When there stuff was actually good. Been refurbished so it's 9.5/10 cosmetic. 10/10 mechanical. If your interested shoot me a pm
Well Christmas interfered with the transaction. This guy knows what he's talking about. Easy to communicate and deal with. This sub is a beast and def worth 450. Get this sold!!!