connect Apple TV to av receiver

How to connect best depends on the features of the individual components:

Apple TV →[HDMI]→ AV receiver with video passthrough →[HDMI]→ TV

or

Apple TV →[HDMI]→ TV with audio passthrough over HDMI ARC →[HDMI ARC]→ receiver

or

Apple TV →[HDMI]→ TV →[optical]→ receiver without HDMI

or

Apple TV →[HDMI]→ HDMI Audio Extractor →[HDMI]→ TV

↘︎[optical]→ receiver without HDMI

Set up Dolby Atmos or surround sound on Apple TV with a sound bar or AV receiver - Apple Support

Play audio in Dolby Atmos or surround sound on your Apple TV - Apple Support