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Amazon.com: Monolith THX Ultra Certified 2000 Watt Powered Subwoofer - 13-Inch, Massive Output, Low Distortion, for Studio and Home Theater Systems, Black Ash Finish : Electronics
Monoprice Monolith THX 13" Audiophile Grade Subwoofer for the Extreme Bassaholic - YouTube
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Monolith by Monoprice M-10 V2 THX Subwoofer Review | AV Gadgets