I finally made an account on resetera just to comment on this....
So I've been going through the exact same issues and here's what I've come up with:
SETUP:
85X900H
- eArc enabled
- HDMI 3 set to enhanced (Dolby Vision)
- Sound profile: External speakers, Auto 2
Denon-AVRS750H
PS5 connected to HDMI 2 (4K60 MAX)
XBox Series X connected HDMI 4 (set to Enhanced 4K120)
So I've been experiencing a great deal of lip sync issues with games, movies, etc. and like a few of you here I'm super sensitive to it. The fix seems to be turning everything to DTS for the things that are connected to the TV and then use the receiver audio delay to adjust for things that are connected to the receiver. Using various tests on YouTube seems to verify that this is the fix.
For whatever ryhme or reason, when I select Dolby Digital for my game consoles it's fine except when a game doesn't support that codec natively. What ends up happening in those cases is that the receiver seems to get a stream of audio it doesn't know about so it just calls it "Multi In". THAT seems to require extra processing or something which causes a delay.
However, when setting it to DTS it never gets out of DTS mode. It's always playing in DTS Neo:X mode on both the PS5 and Xbox. Soo....there's something wrong with my receiver and the whole "Multi In".
Settings:
TV Audio:
AV Sync: Off
eArc: Auto
Audio Mode: Auto 2
XBox:
HDMI Audio: 5.1 (or whatever you need)
Bitstream format: DTS Master Audio (I think you need to purchase the DTS app for this...$25CDN)
PS5:
Audio Format: DTS
That seems to have resolved a lot of my audio issues.
When I use AppleTV Dolby Atmos works fine but anything that's just 5.1 goes to multi-channel and then there's delay. I don't know how to force my receiver to force a codec from AppleTV outside of disabling Atmos and enabling Dolby Digital 5.1
thanks for posting this. I'm having almost the exact same issues that you described particularly with audio sync.
i've been able to mostly fix it by leaving 120 Hz mode. but that still doesn't fix it entirely for bitstream formats.
There is a problem with the HDMI EArc. Namely, LPCM is fine, DTS is good (but not perfect quality compared to when I run my devices directly through my receiver), and dolby formats, particularly on xbox, have a slight sync audio delay.
Per your advice, I've set my receiver to the max available for audio sync tinkering and it still isn't enough. I am sad.
Optical is an even worse mess, I won't even go there.
I thought all the talk about the 4K 120 Hz blurriness was just people being picky. They are not. There is blur. Even after the latest "fix".
I've mostly had enough of all this tinkering and simply went back to my format of last generation.
Went back and plugged all of my consoles into my receiver, and just have one output from the receiver into the TV input. 4K 60 with HDR10 and with Dolby Vision and Atmos sound is fine with me. It looks and sounds outstanding.
But so did my last TV so I spent $1K+ for....nothing I guess.
I'm disappointed but it is what it is. I'm hoping future software updates will fix the minor EArc issues remaining.