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Amazon.com: Rockville W8K9D4 8" Inch 2000w Peak Car Audio Subwoofer Dual 4-Ohm Sub 500w RMS CEA Rated, Black : Electronics
Amazon.com: Rockville WHEEL OF BASS 8" Slim Under-Seat Powered Truck/Car Audio Subwoofer Sub : Electronics
Amazon.com: PyleUsa Single Voice Coil Car Subwoofer - 8 Inches, 200 Watts at 4-Ohm Car Audio Powered Subwoofer, Injection Cone with Rubber Edge, High-Powered Car Subwoofer, Audio - PLMW83 Black : Electronics