Amazon.com: Pyle Car Vehicle Subwoofer Audio Speaker - 10 Inch Blue Injection Molded Cone, Blue Chrome-Plated Plastic Basket, Dual Voice Coil 4 Ohm Impedance, 1000W Power For Vehicle Stereo Sound System PLBW104 :
Amazon.com: Sound Town 15" 450W Raw Woofer Speaker with 4" Voice Coil, 100 oz Magnet, Replacement Woofer for PA/DJ Subwoofer, 4-ohm (STLF-1504-4) : Everything Else
Amazon.com: MTX TN10-04 Audio 10 inch 300 Watt Car Audio 84.9 dB 4 OHM Single Voice Coil Subwoofer (4 Pack) : Electronics
Harmony Audio 4X HA-C124 Car Competition 12" Sub 2200W Dual 4 Ohm Subwoofer New : Electronics - 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 Sound System
Amazon.com: Planet Audio AC10D Anarchy Series 10 Inch Car Subwoofer - 1500 Watts Max, Dual 4 Ohm Voice Coil, Sold Individually, for Truck, Boxes, Enclosures, Use with Amplifier : Electronics