Alto Professional Truesonic TS218S 18" Powered Subwoofer (Discontinued) | Gearank
Amazon.com: Alto Professional TX212S - 900 Watt 12" Powered Speaker Subwoofer with DSP, Selector for Companion PA Speaker and Class D Amplifier with Overdrive Protection, black : Musical Instruments
Alto Professional TX212S 900-watt 12-inch Powered Subwoofer | Sweetwater