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Monolith by Monoprice M-10 V2 10in THX Certified Select 500 Watt Powered Subwoofer (Open Box) - Monoprice.com
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Amazon.com: Monolith M-10 V2 10in THX Certified Select 500 Watt Powered Subwoofer, Massive Output, Low Distortion, Vented HDF Cabinet : Electronics
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