Originally Posted by jdsmoothie
We haven't heard much regarding eARC from an HD source connected to the TV. Is the TV passing the HD audio (ie. Dolby TrueHD or DTS HD-MA) from BD/4k Ultra discs?
The source I've tested the most is a Panasonic U820 BD player and I've been playing a variety of discs with a variety of soundtracks.
When the LG C9 is configured to send ARC to the Denon then I am getting either DD+ or Atmos depending on which BD track I am selecting.
I have never seen that I am getting any other multi-channel formats but of course would need to test further.
If I switch the LG C9 to "eARC" in the audio settings menu then the audio drops down to 2-channel stereo regardless of what audio track is selected. It will be in "stereo" at that point for all TV connected sources such as my Apple TV 4K or my PS4 Pro.
It's rather frustrating to me that there doesn't appear to be an indicator on the Denon to show if the connection is legacy ARC vs EARC. Perhaps I've missed it but I don't see any way of deducing what it thinks is going on.
The fact that I lose picture/sound at exactly 1 hour makes me somewhat suspicious that there is some problem with an HDMI handshake between the C9 and the BD player. I might have to disable any HDMI control to see if it has any effect on the problem. I haven't seen the problem on other sources but haven't used them much.
I can also try swapping the cable but the consistent 1 hour mark (happened 3 times) leaves me suspicious that some control channel timer is expiring and the LG TV or BD player is puking on the connection.
HDMI CEC sucks which is one reason I wanted a new TV that supported the eARC feature and why I replaced a perfectly serviceable 4 year old Denon with a newer one.