Pioneer PRO Series 12" 1,500-Watt Subwoofer in the Mobile Audio department at Lowes.com
TS-A2000LD2 - 8" - 700w Max Power, Dual 2W Voice Coil, Rubber Surround - Shallow Mount Subwoofer | Pioneer Electronics USA
Amazon.com: Alphasonik AS8DF 8 inch 600 Watts 4-Ohm Down Fire Shallow Mount Flat Enclosed Sub woofer Slim Thin Loaded Subwoofer Air Tight Sealed Bass Enclosure : Electronics
Pioneer - TS-M800PRO - 8-Inch PRO Series High Efficiency Mid-Bass Speaker Driver 884938171274 | eBay