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Amazon.com: DS18 EXL-XX12.2D Subwoofer in Black - 12" Speaker, 4,000 Max Power, 2,000 RMS Power, Fiber Glass Dust Cap, Red Aluminum Frame, Dual Voice Coil 2+2 Ohm Impedance, Treated Rubber Edge (1
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Amazon.com: ORION HCCA151SPLX Extreme High Performance 15” Competiton Grade SPL Car Subwoofer, 30000W Max Power, 7500W RMS, Dual 1-Ohm, 4” DVC Voice Coil - Powerful HCCA Series Black Coil for Cars, Trucks,
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