Amazon.com: BOSS Audio Systems CXX8 8 Inch Car Subwoofer - 600 Watts Maximum Power, Single 4 Ohm Voice Coil, Easy Mounting, Sold Individually : Electronics
American Bass 10" 600 Watt DVC 4 Ohm Shallow Mount Subwoofer Black | Big Jeff Online Inc
MTX 3510-04S 10" 600 Watt Shallow Mount Car Audio Subwoofer Slim Sub SVC 4-ohm - Walmart.com
BOSS Audio Systems BE8D Elite Series 8 Inch Car Audio Subwoofer - 600 Watts Max, Dual 4 Ohm Voice Coil, For Truck Boxes and Enclosures, Hook Up To Amplifier - Walmart.com