Skar Audio - SDR-18 | 18" 1,200 Watt Max Power Car Subwoofer
Best Buy: JBL 18" Powered Subwoofer Black JRX118SP
Buy JBL SRX818SP 18" Powered Subwoofer | Sam Ash Music
McLaren 18" Subwoofer M16-18
Rockville RBG18S 18" 2000 Watt Subwoofer - Black for sale online | eBay
18 Inch Powered Subwoofer Bass Cabinet - 500 Watts RMS | Powered 18 Inch Sub Cab | Powered 18 Inch sub woofer | Powered 18 sub | Power | Active 18 Inch Subwoofer Cabinet | 18 Inch Active Sub | Active – Seismic Audio