Sound Town 18" Cast Aluminum Frame High-Power Raw Woofer Speaker, 1000 Watts Pro Audio PA DJ Replacement Subwoofer Low Frequency Driver (STLF-18500A) - Walmart.com
RCF L18P300 Low Power Compression 18" inch Woofer Speaker 2,000 Watts 701748808216 | eBay
QSC KS118 3,600W 18" Powered Subwoofer | Guitar Center
Pair of 18 Inch Powered Subwoofer Bass Cabinets - 800 Watts RMS Each | Powered 18 Inch Sub Cabs | Powered 18 Inch sub woofers | Powered 18 sub | Power | Active 18 Inch Subwoofer Pair | Pair of 18 Inch – Seismic Audio