This is a YAMAHA AV amplifier, model DSP-AX2500. I have confirmed sound output on all channels and inputs. Internal cleaning and maintenance have been performed, allowing for long-term use. It is in good condition and I believe it is a beautiful item. The power supply's 3-terminal regulator has been replaced with a new one, and other deteriorated parts have been replaced. I am selling it because I no longer need it after using it for about two months. Feel free to ask any other questions you may have. Instant purchase is OK. #amplifier #audio