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I am not sure I understand your issue correctly but does page 111 of the manual help? Lipsync (Lipsync)Adjusts the delay between video and audio output.Setting range0 ms to 500 ms (1 ms increments)This setting is available only when “Delay Enable” (p.126) in the “Setup” menu is set to “Enable” (default).
What is the source? It may have lip sync adjustments too.
Have you tried taking out the sound processing e.g. either using the Pure Direct or Stereo Mode to see if the problem goes away?
You may have to join AVS Forum and post your question in the Yamaha CX-A5200 thread:https://www.avsforum.com/forum/90-receivers-amps-processors/2597145-yamaha-cx-a5200-aventage-11-2-channel-av-preamplifier-musiccast.html
But this deletes the whole purpose for getting the new Yamaha...7.2.2 surround sound, Dolby Atmos.
Return the Yamaha. Hopefully you bought it at Crutchfield so you can replace it with an Anthem AVM 60 for not much more money. The AVM 60 is a wonderful sounding machine with absolutely no harshness, it sounds like a high end preamp, although I only use it for video and blu-ray movies. I have one and am 100% satisfied. If you still have the lip sync with the Anthem at least you have a better processor.
Those darn secret handshakes, glad you found the problem
My guess is that most people run every channel in their AVR in the same way. If you do that does the problem go away?
The echo goes away, but then we have the audio/video out of sync. When running the L&R channels in analog output, with the Center off, it is perfectly synced. With the Center on...major echo.
Weird? Do you have access to another AVR? Perhaps the Yamaha is the root of the problem.
Sold my Integra DHC-80.3 9.2. (should have kept it!). But...we do have an NAD T-163, which is a very musical pre-amp. But it has zero HDMI inputs!The analog stereo audio travels faster than the HDMI audio? The L&R analog goes to a two channel all tube pre-amp, and a solid state power amp. No processing. Pure sound as was intended by the audio engineer.
My novice guess is yes analog stereo audio travels faster than the HDMI audio. If one looks at the HDMI cable pin out there is no indication that each channel is carried on it own 'wire'. Thus a stream of bits needs to be converted into N channels by feeding the bits through a processor.https://www.electronics-notes.com/articles/audio-video/hdmi/hdmi-pinouts-connections.php