Seismic Audio Quake Q 18 Woofer, 500 W RMS, 1000 W PMPO, 2 Pack - Walmart.com
Amazon.com: Seismic Audio - 18" Down Firing Pro Audio Subwoofer PA Cabinet : Musical Instruments
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