Rockford Fosgate R300-12 300 Watt 12 Inch Powered Subwoofer + Remote Bass Level Control Included
Bought this to add some low end to my monsoon system in a G6.  Love it.  The install was easy, and we were rollin in about 2 hours-power was the hardest part.  I used the high level inputs, no remote power and just wired up power and ground to get it done.  Turns on with signal on the speaker wires and that's all there is to it.  I would say it hits hard, but I've def experienced a lot more bass.  All things considered for 200 bucks you really can't beat this.  After reading all the bad reviews of the BassL