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Monoprice Unveils New Monolith THX Ultra-Certified Powered Subwoofers | audioXpress
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Amazon.com: Monolith 13 Inches THX Ultra Certified 2000 Watt Powered Subwoofer Massive Output, Low Distortion, for Studio and Home Theater Systems : Electronics
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SOLD* Monoprice Monolith 10" THX Subwoofer for sale - NEW-ish *SOLD* | AVS Forum
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