This is a Mark Levinson No 23 dual monaural power amplifier. 200 watts per channel into 8 ohms and 400 watts per channel into 4 ohms. I am the original owner of this unit having purchased it from Peter McGrath's Sound Components. This amp has been my primary power source since new and has worked flawlessly the entire time. The sound is classic Mark Levinson, powerful bass, smooth mid-range and wonderful stereo sound. I recently sold my ML 380S preamp & 30.6 DAC so my amp is currently sitting idle. The unit weighs 105 lbs but I will pay the shipping within the 48 US states. PayPal only please. No longer have original box but will pack it well.