built-in 1,000-watt Class D amplifier (2 x 500 watts RMS) dual 6-1/2" Uni-core force-canceling drivers ultra-compact, acoustic suspension (sealed) cabinet design frequency response: 11-200 Hz (±3 dB) maximum output: 105 dB down to 11 Hz 5 room-placement EQ presets help you optimize your bass for its environment Room, Wall, Corner, Cabinet, and Apartment modes Music Integrity Engine uses several DSP algorithms to analyze the audio signal for deep, accurate bass a wide range of controls and connections lets you customize your bass to suit your needs variable low-pass crossover (40-140 Hz) phase control switch (0°/180°) line-level/LFE RCA and speaker-level inputs line-level output with selectable high-pass filtering independent volume control connect to your system wirelessly with the optional KEF KW1 wireless subwoofer adapter kit (sold separately) detachable power cord 10-1/16"W x 9-11/16"H x 9-3/4"D weight: 30.9 lbs.