STLF-18120A | 18" Cast Aluminum Frame High-Power Raw Woofer Speaker, 5 – Sound Town
MMA124- 12" 500 Watts RMS Dual 4 Ohm Subwoofer
Amazon.com: Pyramid 12 Inch Car Subwoofer Speaker - 500 Watt High Powered Car Audio Sound Component Speaker System w/ 1.5 Inch Kapton Bobbin Voice Coil, 8 Ohm, 25 oz Magnet, Cloth Edge
Amazon.com: Seismic Audio - SA-SBL124-12 Inch Dual 4 Ohm Slim Mount Car Audio Subwoofer 500 Watts Max Power : Everything Else
Nemesis Audio NA-8E v.2 8" Car Subwoofer 500 Watts DVCSpecifications: – Moon Car Stereo
Sundown Audio Ev4 10" inch DVC Dual 2 Ohm (E Series) Car Subwoofer 500 Watts RMS