CAB Ultra 18" inch DVC Dual 4 Ohm (Ultra Series) Car Subwoofer 1500 Watts RMS
BOA181 - 18 inch Subwoofer 6,000 Watts RMS Dual 1 Ohm Mega Subwoofer
18" HDX4 Series Subwoofers
HT-18 v3 - Subwoofers
ZVX-18v2 | 18" 3,200 Watt Max Power Car Subwoofer - Skar Audio
Sundown Audio Xv3 18" inch DVC Dual 1 Ohm (X Series) Car Subwoofer 2000 Watts RMS
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
18″ Platform 3 – PSI Car Audio
STLF-1804-4 | 18" 450W Raw Woofer Replacement Speaker, 4" Voice Coil, 4-Ohm – Sound Town