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Amazon.com: Audiopipe TXX-BDC4-12D2 Subwoofer Quad Stack 12-inch 1100 Watts RMS 2200 Watt Max Impedance Dual 2 Ohm DVC Vehicle Car Audio Subwoofer Speaker System Voice Coil 3" BASV 4-Layer : Electronics
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Amazon.com: Audiopipe TXX-BDC4-10 Subwoofer Quad Stack 10 Inch 1800 Watt High Performance Powerful 4 Ohm DVC Vehicle Car Sub Audio Subwoofer Speaker System, Black : Electronics
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