Amazon.com: CT Sounds TROPO-18-D4 18 Inch Car Subwoofer Dual 4 Ohm, 1300 Watts Max : Everything Else
Sundown Audio SAv2 18" inch DVC Dual 4 Ohm (SA Series) Car Subwoofer 1000 Watts RMS
Legatia Subwoofers - Hybrid Audio Technologies
Sundown Audio Xv3 18" inch DVC Dual 1 Ohm (X Series) Car Subwoofer 2000 Watts RMS
Sundown Audio 18 INCH X-18 v.3 Series 2000W DVC D2 Subwoofer – Sounds Limited
18 Inch Powered Subwoofer Bass Cabinet - 800 Watts RMS | Powered 18 Inch Sub Cab | Powered 18 Inch sub woofer | Powered 18 sub | Power | Active 18 Inch Subwoofer – Seismic Audio
Amazon.com: Skar Audio EVL-18 D4 18" 2500 Watt Max Power Dual 4 Ohm Car Subwoofer : Electronics
Rockville RVW1800P4 1800w 18" Raw DJ Subwoofer 4 Ohm Sub Woofer 107OZ Magnet
JBL-EON718S | JBL Professional Loudspeakers
CAB Ultra 18" inch DVC Dual 4 Ohm (Ultra Series) Car Subwoofer 1500 Watts RMS