Amazon.com: DS18 GEN-X154D Subwoofer in Black - 4 Layer Black Aluminum Voice Coil, 15", 1,100W Max Power, 500W RMS, Dual 4 Ohms, DVC - Powerful Car Audio Bass Speaker (1 Speaker) : Everything Else
Amazon.com: pkg SOLID1 - Focal Monoblock 470 W RMS Power Amplifier + Pair of SUB P30 - Focal 12" 250W RMS 500W Max Single 4-Ohm Subwoofer : Electronics