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Amazon.com: DS18 ZR6.4D Elite-Z 6 Inch Car Audio Subwoofer 600W Watts Dual Voice Coil 4-Ohm DVC 4+4 Ohm (1 Speaker) : Video Games
Amazon.com: Pioneer TSW312D4 Champion Series 12" 1500 Watt Dual 4 Ohm Voice Coil DVC Car Subwoofer : Electronics
