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
Pioneer TS-3003D4 Subwoofer 2000 watt 12” | eBay
Amazon.com: PIONEER TS-W3003D4 Champion Series PRO 12" 2,000-Watt Subwoofer : Electronics
2 x PIONEER TS-W3003D4 12" 12 INCH DUAL VOICE COIL 4 OHM CAR AUDIO PRO SUBWOOFER 884938234610 | eBay