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Pioneer TS-W310S4 12" 1,400-Watt Champion Series Component Subwoofer - Single 4 ohm voice coil
Amazon.com: Customer reviews: Pioneer TSW312D4 Champion Series 12" 1500 Watt Dual 4 Ohm Voice Coil DVC Car Subwoofer
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Pioneer TS-W3003D4 12" Champion Series Pro Subwoofer With 2000 Watts Max Power - Dual 4 ohm
Pioneer Champion Pro Car Subwoofer (TSW2502) - YouTube
Pioneer TS-W3002D4 Champion Series 12" 3500W PRO DVC Subwoofer 4+4 Ohm