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Amazon.com: Monolith Powered Subwoofer - 15 Inch with 1,000 Watt Amplifier, THX Certified, Ideal for Professional Studio and Home Theater
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Monoprice Monolith M-10 V2 10in THX Certified Select 500 Watt Powered Subwoofer, Massive Output, Low Distortion, Vented HDF Cabinet - Walmart.com
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