The Alesis RA150 studio reference power amplifier features low distortion, 10 Hz-70 kHz frequency response, innovative styling and high-quality amplification at a low cost. It provides a crisp, clean signal to your studio monitors and incorporates advanced convection cooling for heat dissapation. Features: 45 watts into 8 ohms per channel; signal to noise ratio >105dB; distortion < .02% at 4 ohms; stereo or bridged mono operation; two rack-space unit (2RU).