PRX718XLF 18" Self-Powered Subwoofer System - National
MT21A Built-in DSP single 21" Self-powered Subwoofer with Compact Cabinet Box - Buy 21" subwoofer, single 21 inch subwoofer, self powered subwoofer Product on Sanway Professional Audio Equipment Co., Ltd.
Pro DG GTA 218 B Dual 18″ 9600 Watts L.A. Self-powered Subwoofer | ProSoundGear
Amazon.com: JBL Professional SRX818SP Portable Self-Powered Subwoofer System, 18-Inch, Black : Everything Else
Mr. Dj 15" 5400W PA/DJ/Powered Subwoofer Bluetooth/USB/LINE/2 Speaker Output | Reverb