Alto Pro TS315 15-inch active full-range speaker, 2000W | Bax Music
Alto Professional TS315S 15" Active Subwoofer w/DSP (briefly used) - Central Music
Alto Professional TS315S 15-inch Powered Subwoofer Reviews | Sweetwater
Amazon.com: Alto Professional TS315S | 2000 Watt 15 Inch Powered Portable PA Subwoofer With Selectable DSP Output Modes For Matching With Companion PA Speakers : Musical Instruments