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Monoprice Monolith M-12 V2 12in THX Certified Ultra 500 Watt Powered Subwoofer, Massive Output, Low Distortion, Vented HDF Cabinet - Newegg.com
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Amazon.com: Monolith THX Certified Ultra 2000 Watt Powered Subwoofer - 16-Inch, Low Distortion, RCA and XLR Inputs, for Studio and Home Theater Systems, Matte Black : Electronics
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