Amazon.com: Sound Storm Laboratories CG8D 8 Inch Car Subwoofer - 800 Watts Maximum Power, Dual 4 Ohm Voice Coil, Sold Individually : Everything Else
Amazon.com: BOSS Audio Systems CUBE8 Car Subwoofer and Amp Package – Built-in Amplifier, 8 Inch Subwoofer with Passive Radiator, Remote Subwoofer Control : Electronics
DS18 SQBASS8 8" Amplified Under Seat Car Subwoofer 600 Watts.