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Amazon.com: Rockford Fosgate Shallow 12" R2 500 Watt 2-Ohm DVC Subwoofer (4 Pack) : Electronics
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Amazon.com: Wet Sounds REVO 12 FA S2-B Black Free Air 2 Ohm 12 Inch Subwoofer, Grill Sold Seperately (Renewed) : Electronics
