Amazon.com: DS18 SLC10S Car Subwoofer Audio Speaker - 10" in. Paper Glass Fiber Cone, Black Steel Basket, Single Voice Coil 4 Ohm Impedance, 440W MAX Power and Foam Surround for Vehicle Stereo
Amazon.com: DS18 EXL-X10.2D 10" Car Subwoofer 1700 Watts Max Power 850 Watts RMS 2 + 2 Ohms Dual Voice Coil - Competition Grade Bass Powerful Performance for Car Truck Audio Sound Systems - 1 Speaker : Electronics