Skip to main content
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.

This topic has been closed for further comments. You can use the search bar to find a similar topic, or create a new one by clicking Create Topic at the top of the page.
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
View in thread

85 replies

Show previous replies
rmartin7Author
August 25, 2023

Are you talking about the privacy settings on the Apple TV?  Which setting, do you switch it off and then back on?

Juno8
Lyricist III
August 25, 2023

LG settings

Support; Privacy & Terms; User Agreements 

rmartin7Author
August 25, 2023

Thanks.  That worked.  Not sure that I will use it but interesting.

Juno8
Lyricist III
August 25, 2023

It’s the only way currently to maintain the proper settings on the LG for best sound. 

rmartin7Author
August 26, 2023

I think I have solved the problem.  These are my current settings:

Apple TV 4K 3rd generation, 128 GB, ethernet

    Video and Audio
        Format 4K SDR
        HDMI Output YCbCr
        Chroma 4:4:4
        Match Content
            Match Dynamic Range On
            Match Frame Rate On
            Quick Media Switching On
        Audio Output Receiver Speakers
        Audio Format
            Change Format Off
            Dolby Atmos On
        Audio Mode Auto
        Color Balance Balanced (with Enable Dolby Vision not selected, I 
            used the    color balance calibration with my iPhone.  With Dolby Vision enabled this is not an    option.)

LG 65OLEDC3AUA

    General
        External Devices
            HDMI Settings
                4:4:4 Pass Through On
                Quick Media Switching On
                HDMI Deep Color 4K
                SIMPLINK (HDMI-CEC) On
        Sound
            Sound Out HDMI(ARC) Device
            Advanced Settings
                Select HDMI Input Audio Format  Bitstream
                Digital Sound Output Pass Through
                eARC Support On

 

I am not sure why this works or if these setting affect other areas with video or audio.  Let me know what you think.

rmartin7Author
August 27, 2023

I thought everything was OK but it wasn’t.  I can switch HDMI inputs without problem but if I switch to one of the WebOS apps like LG Channels the problem recurs.  If I unplug the TV and plug it in again the problem resolves until the next time I use WebOs apps.  

Juno8
Lyricist III
August 27, 2023

Looks like you turned off Dolby Vision as a format well. 

rmartin7Author
August 27, 2023

From what I understand choosing 4K SDR only applies to the home screen.  So long as match content and match frame rate are on, switching  to Dolby Atmos content puts the Apple TV in Dolby  Atmos.  That seems to be my experience.  

I am not sure why I have problems using the WebOs apps.

Juno8
Lyricist III
August 27, 2023

I don’t use LG apps ever. The apps on the Apple TV are far superior to my experience. 

rmartin7Author
August 27, 2023

I am having the same issues again so I do not have a solution.  I am back to using my Apple TV 4K 2nd generation.

Show more replies
Terms & ConditionsAccessibility statement