Amazon.com: Massive Audio ECO12S4 – 12 Inch Car Audio 500 Watt ECO Series Subwoofer, Single 4 Ohm, 6mm Top Plate, Steel Basket. Sold Individually : Electronics
10 Inch Subwoofer 4 Ohm 500 Watt RMS Powered Car Sub Audio Speaker Dual Voice | eBay
DS18 SLC12S 12" Car Subwoofer 500 Watts Svc 4-Ohm
Sundown Audio Ev4 10" inch DVC Dual 2 Ohm (E Series) Car Subwoofer 500 Watts RMS
JBL 500 Watt Subwoofer.. Make Offer | eBay
Amazon.com: Pyramid 10 Inch Car Subwoofer Speaker - 500 Watt High Powered Car Audio Sound Component Speaker System w/ 2 Inch High-Temperature Kapton Voice Coil, 85.6 dB, 8 Ohm, 60 oz Magnet - Pyramid PW1048USX : Electronics