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    MartinLogan Dynamo 1100X Black Subwoofer Product highlights: frequency response: 22-200 Hz (±3dB) built-in amplifier delivers 650 watts of continuous power (1,300 watts peak) 12″ high-excursion polypropylene woofer with an inverted surround and cast aluminum basket free MartinLogan Subwoofer Control app for iOS® and Android™ for easy setup and configuration continuously variable low-pass 35-120 Hz crossover (app only) continuously variable phase control (app only) 3 preset listening modes: Music, Night, and Movie (app only) level control (app or rear-panel knob) auto on/off switch on back panel left/right and LFE RCA line-level inputs balanced XLR LFE input speaker-level inputs 12-volt trigger input for custom included Energy Transfer NEW OPEN BOX with WARRANTY