moving my post here
it was originally asked here in thread "OFFICIAL" 2019 LG C9 Consolidated Info, FAQ, Troubleshooting, Firmware & more
So my set up :
- LG 65C9 Oled TV with HDMI 2.1 and eARC
- Samsung HW-Q90R soundbar with Atmos decode, HDMI 2.0a
- Xbox One X
So I connected the soundbar to the TV via HDMI ARC (many websites mention there is eARC enable on this soundbar made available via a firmware update, mentioned by ThechRadar or Digital Trends), and Xbox One X is connected to the TV directly to leverage HDMI 2.1 features such as ALLm or VRR.
For the soundbar eARC, I've done many tests with apps directly on TV and I don't think eARC is really enable. Only Netflix can send Atmos to the soundbar (soundbar display the logo) but it's compressed DD+ Atmos, not a DD True HD Atmos.
With the LG tv configured to digital audio output on passthrough mode, when connecteing the Xbox One X also configured to out "Dolby Atmos for Home Theater" I also receive Atmos sound on the soundbar (logo being displayed on it) but I have a sync issue as I have a huge delay on audio !
And absolutely impossible to correct this delay through TV settings (AV sync) nor soundbar setting (SYNC).
But if I change the audio output from Xbox One X to Dolby Digital, then the sync issue disappear !
So my guess is that the Atmos audio can't be delivered properly from Xbox to soundbar through TV as this is not real eARC. Anyone else having this issue ? any possible fix existing ?
Or should we simply wait for Samsung to make the eARC update available as they promised ?