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Kicker 48TRTP82 Sealed downward-firing enclosure with CompRT® 8" shallow-mount subwoofer and passive radiator at Crutchfield
Kicker 47TRTP102 10-Inch (25cm) Thin Down Firing Subwoofer And Passive Radiator Enclosure, 2-Ohm - Walmart.com
Kicker TRTP12 COMPRT Down Firing Enclosure Subwoofer System 12" 1000 Watts Max * for sale online | eBay