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Amazon.com: Seismic Audio - SA-GFC124-12 Inch 2200 Watt Max Power Dual 4 Ohm Car Audio Subwoofer : Musical Instruments
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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) : Everything Else
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