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Alto Professional TS315S 15" Active Subwoofer w/DSP (briefly used) - Central Music
Alto Professional TS315S Best Priced 15" Powered Subwoofer 2000 Watt Peak - YouTube
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