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Pioneer Electronics on Twitter: "The Champion Series Subwoofers feature an enclosed basket structure that is designed to support the steel basket by reducing the spread of vibration that causes bass loss frequency. #
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Amazon.com: Pioneer TS-A301D4 Champion Series 12" 1600 W Max Power, Dual 4 Ohm Voice Coil - Component Subwoofer : Electronics
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PIONEER TSW312D4 12-INCH 1600 WATTS MAX DUAL 4-OHM VOICE COIL CAR SUBWOOFER -NEW 884938476409 | eBay
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