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Amazon.com: CT Sounds TROPO-18-D2 18 Inch Car Subwoofer Dual 2 Ohm, 1300 Watts Max : Everything Else
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Amazon.com: DS18 PRO-BX18N.2D Car Subwoofer Audio Speaker - 18" in Neodymium Magnet, 6" Dual Voice Coil, 4 Ohm Impedance, 2500W Rms Power, 5000W Max Power - Reinforced Paper Cone for Outstanding Performance :
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