The Denon AVR-5803 is a high-end audio/video receiver that was released by Denon in 2002. It is part of their AVR series and offers advanced features and technology for home theater systems. The receiver supports various audio formats and has multiple input and output options, including HDMI and digital audio connections. It is known for its exceptional audio quality and powerful amplification. The AVR-5803 also includes video processing capabilities and can handle video sources such as DVD players and gaming consoles. It has a built-in tuner and provides support for multi-room audio setups. The receiver has received positive reviews for its performance and versatility.