Amazon.com: Pioneer TS-A300D4 12 Inch 1500 Watts Max Power Dual 4-Ohm Voice Coil A Series Car Audio Stereo Subwoofer Loudspeakers / Free Alphasonik Earbuds : Electronics
Amazon.com: PIONEER TS-W3003D4 Champion Series PRO 12" 2,000-Watt Subwoofer : Electronics
TS-W3002D2|D4 - 12" Champion Series PRO Subwoofer with 3500 Watts Max. (1000 Watts Nom.) | Pioneer Electronics USA
2014 Pioneer Champion Series PRO Subwoofer - YouTube