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rmartin7
August 5, 2023
Answered

Sonos Arc, Apple TV 4K and eARC setting on LG OLED C3

I just bought a new Sonos Arc and LG 65OLED65AUA tv.  Everything seems OK but I am having problems with sound from my Apple TV 4K (latest version).  I only get sound when Dolby Atmos content is played, no sound with Dolby 5.1, HD, etc.  I spent and hour with Sonos phone  support yesterday.  We were unable to find a solution.  I tried different settings on the Apple TV and LG tv.  Today I turned off the eARC setting on the LG tv and now all is working.  I think with eARC there is more information transferred with ARC and there might be a slight difference in sound  with Dolby Atmos.  The eARC was turned on automatically when I installed the Sonos Arc on the LG tv.  Just curious why the eARC setting seems to fix the problem.  Thanks.

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GuitarSuperstarAnswer
Lead Maestro
August 6, 2023

Set the TV to these settings:

HDMI Input Audio Format: Bitstream

Digital Sound Output: Pass Through

eARC Support: On
 

Set the Apple TV audio settings to this:

Change Format: Off

Dolby Atmos: On

 

Then do this:

Disconnect everything from the TV and unplug the Arc, Apple TV, and TV from power for a couple of minutes. Plug everything back in but keep everything disconnected. Make sure Simplink is enabled in the TV settings. Run TV Setup in the Sonos app and follow the app instructions. When the app instructs you, connect the Arc to the TV’s HDMI eARC port using the Sonos-supplied HDMI cable. After the Arc has been successfully connected, connect the Apple TV to the TV.

"Receive with simplicity everything that happens to you." - Rashi
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Ken_Griffiths
Ken_Griffiths
August 14, 2023

I wish I had another Sonos Arc to plug-in. If the problem doesn’t persist with the 2nd Sonos Arc then it can be assumed my existing Sonos Arc is at fault. 

But… you mentioned earlier, that if you set the LG TV digital sound-out to ‘Auto’ on the HDMI-ARC/eARC port - that it fixed the audio issue from the Apple TV. So I can’t see the soundbar being faulty. That sounds much more-like the fault lies with the TV and actually, that’s the only difference between your setup and @Airgetlam’s… Maybe there is a fault in the LG firmware, or hardware, that conflicts with the Apple TV. Replacing the LG hardware is not likely going to fix it either, but maybe a future firmware update will sort it, perhaps 🤔?

Juno8
Lyricist III
August 14, 2023

No offense, but someone else must have said that sound out to Auto worked for them. That is not so with me.

 However, it is the eARC that the Sonos is plugged into. If eARC is turned off, then it works fine business. It could be eARC implementation by Sonos.  It could be eARC implementation by LG.   It could be the audio out implementation of the ATV. 

Juno8
Lyricist III
August 14, 2023

Keep in mind it was the upgrade from the Apple TV second generation to the Apple TV third generation that caused the audio issue to begin.

    Ken_Griffiths
    Ken_Griffiths
    August 14, 2023

    No offense, but someone else must have said that sound out to Auto worked for them. That is not so with me.

     However, it is the eARC that the Sonos is plugged into. If eARC is turned off, then it works fine business. It could be eARC implementation by Sonos.  It could be eARC implementation by LG.   It could be the audio out implementation of the ATV. 

    Ah I thought that TV sound-out setting fixed things for you, my mistake then if it was switching off eARC on the TV.

    Did you ever try swapping out the HDMI cables to see if that might make a difference? Or do you have a friend/family member with an Atmos capable TV that you could try things on, just to see if you can eliminate some things and perhaps discover where the problem(s) may lie?

    Juno8
    Lyricist III
    August 14, 2023

    Haha… all cables, components etc… have been switched out months ago. I have effectively switched out the LG TV three times as I have replaced the motherboard and power supply each time. Other than the display itself, the motherboard and power supply is essentially switching TVs, because there is nothing in TV other than that.  I do not have another Sonos system or television to swap out.  

    GC3
    Headliner I
    August 14, 2023

    Remind me to never buy a damn apple box to watch tv....

      Juno8
      Lyricist III
      August 14, 2023

      FYI

      When I either, reset privacy settings or unplug the LG and plug it back in, all audio functions normally… (Until inputs have been switched on the LG: e.g. watch cable and then switch to ATV)

      rmartin7Author
      August 16, 2023

      I agree.  Using LG Universal Control to switch HDMI input seems to be related.  Just curious if the person with a Vizio tv has eARC enabled?

      Airgetlam
      Airgetlam
      August 16, 2023

      If you’re talking about me, no, the Vizio is too old to have eARC. It does have ARC and that works just fine, in fact I tend to use the Apple Remote, instead of the Vizio remote, just because fewer remotes is better.

      Bruce
      Juno8
      Lyricist III
      August 16, 2023

      ATV works fine with ARC.  eARC does not work properly. 

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