Amazon.com: OSD Nero Dual 8" Powered Subwoofer, 300W Dynamic Active and Passive Woofers, DSP App Control, Gold Platted Inputs, Piano Black Finish DualX8DSP : Electronics
Amazon.com: Sound Town CARME Series Dual 8" 800W Passive PA DJ Subwoofer with Folded Horn Design, Black, for Lounge, Club, Bar, Theater, Restaurant, Church (CARME-208S) : Musical Instruments
Amazon.com: Seismic Audio - SA-BPT10 - High Powered 10 Inch Passive Subwoofer Tube Speaker - 500 Watt Car Audio Sub Speaker Enclosure 4 Ohm with Rear Vent
Amazon.com: Kicker 48TRTP122 Car Audio Down Firing 12" Thin Sub Box w/ Passive Radiator New : Electronics
Amazon.com: Monoprice in-Wall Speaker - 10 Inch Passive Subwoofer, 200 Watts Maximum (Single) - Aria Series : Everything Else
Amazon.com: Mr. Dj PRO-SUB18 18-Inch 3500W Maximum Peak Passive Subwoofer : Musical Instruments
Amazon.com: Earthquake Sound MiniMe DSP P-12 12-inch Powered Subwoofer with DSP Control and SLAPS Passive Radiator Technology : Everything Else
Amazon.com: Rockville SBG1158 15" 800W Passive Pro DJ Subwoofer, MDF Cabinet/Pole Mount : Musical Instruments