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Power 13" T2 Single 2-Ohm Subwoofer | Rockford Fosgate ®
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Visaton W-130 X - 2 X 4 Ohm Double Oscillating Coil Subwoofer 5 1/8in (5 ") | eBay
Memphis Audio PRX1224 Power Reference Series 12" dual voice coil subwoofer * selectable 2- or 4-ohm impedance - Breakers Stereo and Performance
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