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Amazon.com: Blaupunkt GTHS131 GTHS131 Super-Flat 200-Watt-Max Active Subwoofer, Black : Electronics
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Amazon.com: Cerwin-Vega Mobile 12" Powered Active Subwoofer 600W Max : Electronics
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Amazon.com: Patioer 8" 600w Car/Truck Audio Slim Under-Seat Powered Subwoofer Sub Bass Speaker Kit : Electronics
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