Audio Sync is one of the worst things to get your head into, it can ruin your life and keep you awake at night and no matter what tests or results you get sometimes it can make you so obsessive you end up just watching TV staring at peoples mouths or trying to line up gun shots. You nail it with audio delay settings on the AV when watching a film at 24p only for it to look miles out on another frame rate. And the entire journey can be started just because the sync is out on the source file…you end up not even watching TV anymore.
Now whilst I appreciate the above is of no help really it just sums up my experience and how much time I wasted, sometimes just the fact that your centre speaker isnt embedded literally in the panel (like the onboard speakers) can also confuse your mind a bit so placement of this as close to the screen as possible helps. Also there is inbuild adjustments based on how far speakers are from each other and the screen you can make on AV’s, mine has a microphone and I let it calibrate itself based on where we sit.
I tell you, I feel your pain though but what I have found over the years is that the best way to solve it is the reduce the amount of time your TV itself is taking to process an image. For me thats by running TV’s on game mode, any kinda of noise reduction, smooth motion etc etc will vary in its effect from source to source, game mode on my LG B8 switches everything off and makes my TV effectively a monitor giving a consistent starting point and if I need to adjust audio delay I do it on my amp however I dont because if I notice it a fraction out on one film its not the same on the next or it differs on normal cable TV compared to ATV or whatever, I learnt over the years I cant win. Sometimes Apple TV+ content differs from Netflix on the same ATV, I cant adjust it at the start of every show. I used to use a PC with Windows Media Player as my Media Player so getting the ATV it also took some time to get used to the delivery again. One of the times that blew my mind the most was when I need to make the audio come earlier on an old TV but there was no setting for this, just delay, it was a bad few months with that TV.
Now I know there are forensic tests that can be performed and you have noticed it being a problem but from my own experience I would implore you to use a super low latency mode on the TV like Game, ensure enhancements are off and try to accept that sometimes sources just look (from an audio point of view) different, 24p always looks so different to me when it comes to audio delivery from a scene. Especially as I am from the UK which mostly favours 25fps over 23.976fps for TV programs, it seems I am super sensitive to this…and with regards to Gemini Man which is 60fps this looks totally mental but the audio sync seems so good given how smooth it is. When watching BT Sport UHD channel in the UK the audio sync is always out, this is 50fps I think and 4K, I could adjust just for this channel only to wreck every other channel, stupid Virgin Media Box…
I also use match dynamic range and frame rate and without reading that thread, to me these settings OFF would cause sync issue and I like the source to be the source so I dont want my Apple TV to present at its native 60hz Dolby Vision whilst I am watching a 24p source, to me that seems crazy…so these two are always on.
Wireless audio sync isnt designed to solve sync issues with wired AV receivers and surround sound as far as I know.
I am glad to be over it now and can enjoy watching TV and you are welcome to throw this entire post in the bin and carry on down the forensic adjustment path…because these adjustments are there for a reason but we are all friends here and this is my friendly advice because I never did win until I sat back and accepted somethings just dont look ‘right’ and I have to accept that if I sit back and just watch the entire screen I dont convince myself there is something wrong.
For what its worth, I expect if I did run those test it would tell me its out by something, but I dont notice it anymore and im not getting into a situation where im adjusting the sync on the fly, enjoying TV isnt about that. I am at peace, I am wishing you the same.