JL Audio E-SUB 110-GLOSS 10 Inch Powered Subwoofer — Safe and Sound HQ
Amazon.com: DR DOUBLE ROCK CB08 Under-Seat Subwoofer Car Audio 600 Watts 8 inch Slim Powered Subwoofer with Built in Amp Active Compact Subwoofer with Amplified+Bass Volume Control Knob : Electronics