conrad-johnson MF2275 Solid-State Stereo Power Amplifier Power: 135 watts per channel RMS both channels driven into 8 ohms from 20Hz to 20 kHz at no more than 1% total harmonic distortion or intermodulation distortion. Sensitivity: 1.35 V rms to rated power Frequency Response: 20Hz to 20 kHz +0/-.3 dB Hum and Noise: 100 dB below rated power output Phase: Phase correct. Input Impedance: 100 kOhms