The Denon AVR-1801 is a stereo audio/video receiver manufactured by Denon. It is a mid-range receiver that was released in the early 2000s. It has a power output of 70 watts per channel and supports Dolby Digital and DTS audio formats. The AVR-1801 also includes various audio and video inputs and outputs, allowing users to connect multiple devices such as TVs and DVD players. It is designed for home theater setups and provides immersive audio experiences. Additionally, it supports multi-zone functionality, allowing users to play different audio sources in different rooms.