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Monolith by Monoprice M-212 Dual 12in THX Certified Ultra 1000 Watt Powered Subwoofer - Monoprice.com
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Amazon.com: PRORECK PR-122M Complete 1500W Dual 12" Car Subwoofer, Includes Loaded Enclosure with Mono Block Amplifier,Wiring Installation Kit : Electronics
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