Amazon.com: DS18 SLC12S Car Subwoofer Audio Speaker - 12" in. Paper Glass Fiber Cone, Black Steel Basket, Single Voice Coil 4 Ohm Impedance, 500W MAX Power and Foam Surround for Vehicle Stereo
Amazon.com: DS18 12" Subwoofer Combo Package with GEN-X124D Subwoofer and CANDY-X1B Monoblock Amplifier : Electronics