Dolby atmos cutting out on Apple TV 4K + Sonos Arc + certified HDMI 2.1 cables

On a similar thread in this forum, the solution was to set the (LG) TV's eARC audio to "pass-through". Perhaps your Sony offers a similar setting/tweak?

Looking at the Sony settings for maximum eARC pass-through is about your only option since the ATV4K insists on sending post-processed Atmos as multiple (uncompressed) PCM channels and metadata. Feedback to Apple for a digital audio pass-through option might help eventually :-).

Hello billynewport,

The article below will provide information for using HDMI ARC or eARC with your Apple TV 4K Go through the steps to ensure no step was missed upon setup.

Use HDMI ARC or eARC with your Apple TV 4K - Apple Support

"Turn on HDMI ARC or eARC

1. Set up your single or stereo pair of HomePod or HomePod mini speakers as the default speaker(s) for Apple TV. 
2. Go the Home screen on Apple TV and select Settings > Video and Audio > Audio Output. 
3. Under Default Audio Output, make sure that the room with HomePod or HomePod mini is selected. 

4. Under Audio Return Channel, select Play Television Audio. You'll know ARC or eARC is turned on when it says On (ARC) or On (eARC).

If HDMI ARC or eARC isn't working as expected

• If you can't set up HomePod or HomePod mini as the default speaker for Apple TV, make sure that your HomePod or HomePod mini and Apple TV are added to the same room in the Home app. Then try to set up your HomePod or HomePod mini as the default speaker for your Apple TV again. 
• Make sure that your TV supports ARC or eARC. You can check by seeing if there's an ARC label next to your HDMI port, or you can contact your TV manufacturer.
• You might have to turn on ARC, eARC, or HDMI-CEC in the settings of your TV. Check with your TV manufacturer for details. 
• Unplug the HDMI cables from your TV and Apple TV. Then plug the cables in again and try to use ARC or eARC."

We also recommend checking out the article below for setting up Dolby Atmos on Apple TV.

Set up Dolby Atmos or surround sound on Apple TV with a sound bar or AV receiver - Apple Support

Let us know if you have any questions.

Thank you for using Apple Support Communities.

Take care!

Greetings billynewport,

For further support with this issue, please Contact Apple Support directly. They will be in the best position to support you.

Sincerely.

Hey Billy,

I have no solution. Several times I have thought I won’t be bothered by it but it came back about a week ago, and you are correct it is during atmos playback via the Apple TV into the sonos arc. The bang is almost a catastrophic failure sound but alas it fires back up after I restart everything. Used to happen every time with godzilla vs Kong.

[Edited by Moderator]