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Amazon.com: Customer reviews: Pioneer TSW312D4 Champion Series 12" 1500 Watt Dual 4 Ohm Voice Coil DVC Car Subwoofer
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TS-W3003D4 - 12" Champion Series PRO Subwoofer with Dual 4 Ω Voice Coils and 2,000 Watts Max Power (600 Watts Nominal) | Pioneer Electronics USA
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Amazon.com: Pioneer TSW312D4 Champion Series 12" 1500 Watt Dual 4 Ohm Voice Coil DVC Car Subwoofer : Electronics
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