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Kicker 49PTRTP12 Compact down-firing 500-watt powered enclosure with CompRT® 12" shallow-mount subwoofer and passive radiator at Crutchfield
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Amazon.com: KICKER TRTP 12-inch (30cm) Thin Down Firing Subwoofer and Passive Radiator Enclosure, 2-Ohm, RoHS Compliant : Electronics
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Pyle Active Down Firing Subwoofer - 10 Inches, Ported Design with High-to-Low Input Level Controller, Invisible Down-Firing Speaker, Color Black, Built-in Convenience - PSUB10A - Walmart.com
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