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ALTO PROFESSIONAL® LAYS DOWN A ROCK-SOLID FOUNDATION WITH NEW TS3 SERIES POWERED SUBWOOFERS – MusicPlayers.com
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Amazon.com: Alto Professional TS12S - 2500W 12-inch Subwoofer, Powered PA Speaker with 6 Selectable DSP Modes, Easy Setup, 130 dB, 3" Voice Coil, Superior Bass : Musical Instruments
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