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Dayton Audio MX15-22 15" Max-X High Excursion DVC Subwoofer 2 Ohms Per Coil
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Polk Audio HTS 12 (Washed Black Walnut) Powered subwoofer at Crutchfield
Polk Audio Monitor XT12 12" 100W Class A/B Amplifier Subwoofer Midnight Black Monitor XT12 - Best Buy
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BOSS Audio Systems BASS8K 8 Inch Powered Car Subwoofer and Amplifier Wiring Kit Package - 800 Watts Max Power, Under Seat, Low Profile, 8 Gauge Wiring Kit, For Truck Boxes and Enclosures