Amazon.com: BESTISAN Powered Subwoofer, Deep Bass Subwoofer, Down Firing Sub in Compact Size, Easy Setup with Home Theater System, TV, Receiver, Speakers (RCA Cable Included, Black),SW65C : Electronics
BAS8 - 8" 400 Watts RMS Class D Powered Subwoofer in Ported Enclosure,
Polk Audio PSW10 10" Powered Subwoofer, 100W Peak Power, Compact Design, Easy Setup with Home Theater Systems Black PSW10 - Best Buy
PA System Set: Powered 15" Speakers & 18" Subwoofers, Mixer, Microphone System, Audio Cables (CARME115118-NESO-S1) – Sound Town Inc
Monoprice 8in 60-Watt Powered Subwoofer, Black - Monoprice.com
Yamaha DXS18 800W 18 inch Powered Subwoofer | Sweetwater
Jamo C 910 (White) 10" powered subwoofer at Crutchfield