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Pioneer Champion Series TS-A301D4 1600 Watts 12 inch Dual 4 Ohm Subwoofer - Walmart.com
Best Buy: Pioneer Champion Series 12" Single-Voice-Coil 4-Ohm Subwoofer Black TSW310S4
TS-W261D4 - 10" Champion Series Subwoofer with Dual 4 Ohm Voice Coil | Pioneer Electronics USA
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TS-W260D4 - 10" Champion Series Subwoofer with Dual 4 Ω Voice Coils | Pioneer Electronics USA
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