Planet Audio ACR104D 10" Dual 4-OHM Voice Coil Sub Woofer with Matte Blue Poly Injection Cone...
Planet Audio BBD12B Big Bang Series 12 Inch Car Audio Subwoofer - 2500 Watts Max, Dual 4 Ohm Voice Coil, Sold Individually, For Truck Boxes and Enclosures, Hook Up To Amplifier - Walmart.com