I’ve been having all kinds off audio problems with my setup.
Apple TV 4K A2169
LG C2 OLED
Vizio M-Series 2.1 Dolby atmos soundbar M215aw-K6
Monoprice 8K Certified Braided Ultra High Speed HDMI Cable - HDMI 2.1, 8K@60Hz, 48Gbps, CL2 In-Wall Rated, 28AWG, 10ft, Black
All audio is delayed when you first start streaming by 3 to 5 seconds. Sometimes the Apple TV can’t control the volume of the sound bar until I power cycle everything. Sometimes just center channel audio is missing ie no speech. I worked with Apple 2nd level support for weeks doing tests, videos and taking logs and they ended with this is a bug. Keep your Apple TV updated as we work on fixing it. If I stream a video directly from my LG tv it works fine so it’s definitely the Apple TV. I’ve had these issues with all versions of tvOS 17.