mono subwoofer amplifier 150 watts RMS x 1 at 4 ohms (300 watts RMS x 1 at 2 ohms) 500 watts RMS x 1 at 1 ohmFeatures: variable low-pass filter filter (50-250 Hz, 12 dB/octave) selectable subsonic filter (28Hz, 12 dB/octave) variable PEQ2 bass boost (0-18 dB at 45 Hz) C.L.E.A.N. gain setup system includes test tone CD Class-BD amplifier design frequency response: 20-250 Hz Dynamic Thermal Management and MEHSA MOSFET cooling systems MOSFET power and output stages preamp inputs and outputs speaker-level inputs signal-sensing turn-on with speaker-level inputs eliminate need for remote turn-on lead