The Yamaha RX-V 663 is a 7.1-channel AV receiver that supports various audio formats, including Dolby TrueHD and DTS-HD Master Audio. It features HDMI inputs with support for multiple resolutions, making it suitable for high-definition audio and video passthrough. The receiver includes features such as YPAO automatic calibration for optimized speaker setup and a range of DSP programs for enhancing audio playback. Additionally, it has a full set of connectivity options, allowing users to connect multiple sources including Blu-ray players, gaming consoles, and streaming devices.