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Monolith by Monoprice M-215 DUAL 15 inch THX Subwoofer & Monoprice HTP-1 16 Channel Processor |CEDIA - YouTube
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Monolith M-215 THX Ultra Certified Powered Subwoofer - Dual 15in, 2000-Watt Amplifier, Massive Output, Low Distortion, for Home Theater Systems, Black (138543) : Electronics
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