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Amazon.com: BOSS Audio Systems CXX12 Car Subwoofer - 1000 Watts Maximum Power, 12 Inch , Single 4 Ohm Voice Coil, Sold Individually,Black : Electronics
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STAGE 1 - DUAL PORTED SUBWOOFER MDF ENCLOSURE FOR SUNDOWN X8REV.2 SUB BOX | eBay
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Down4sound PRO-FAB HD3- 2 12 Sub Box | Dual HD 12-Inch KERF Port Subwoofer Enclosure Box - Down4Sound Shop