My 12in. insignia subwoofer with a custom built enclosure that my two friends helped me with. It is on a 6oo
watts load (run by the amp on top of the sub) and one 3in. base board. The amp. was free and the sub cost $40 on clearance. The 1/2 in. thick board we used cost about $20 in total. So I think I got a pretty good deal