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Pioneer Champion Series 12" Dual-Voice-Coil 4-Ohm Subwoofer Black TSW311D4 - Best Buy
PIONEER TS-W304R CHAMPION SERIES 12" 4-OHM SUBWOOFER 1,200 WATTS (300 W RMS) NEW | 702MOTORINGLASVEGAS
Amazon.com: PIONEER TS-A301S4 - Powerful 12-inch Subwoofer, 1600 Watts Peak Power, Single 4 Ohm Voice Coil for a Powerful Bass : Electronics
Pioneer Champion TS-A301S4 | 12 Inch 1600W SVC 4 Ohm Car Audio Subwoofer 12" | eBay
Pioneer TS-W3002D4 Champion Series 12" 3500W PRO DVC Subwoofer 4+4 Ohm
Pioneer TS-W3002D2 Champion Series Pro 12" sub with dual 2-ohm voice coils at Crutchfield
Pioneer TS-A301S4 | 500W RMS 12" Champion Series Subwoofer
Amazon.com: Pioneer TSW312D4 Champion Series 12" 1500 Watt Dual 4 Ohm Voice Coil DVC Car Subwoofer : Electronics
Best Buy: Pioneer Champion Series 12" Single-Voice-Coil 4-Ohm Subwoofer Black TSW310S4