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Amazon.com: Pioneer TS-W311D4 12" 1,400-Watt 4O Champion Series Subwoofer (Dual voice coil) : Electronics
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Amazon.com: PIONEER CAR TSA301D4 12-inch 1600 W Max Power, Dual 4 Ohm Voice Coil for for Powerful Bass Champion Series - Component Subwoofer : Electronics
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