This item was my brothers, he left it behind when he joined the military. I have no knowledge of this unit other than the standby light blinks when powered on. Item is very very heavy and solid. Sold AS-ISThis Luxman M-4000 power amplifier is a vintage model from the late 1970s to early 1980s, made in Japan. It offers high power output of 180W and features stereo L/R RCA audio inputs. With 2 channels and 1 input, this amplifier is perfect for use in a home audio setup. The model is a Luxman branded product and is sold AS-IS.