Sonos Arc changes audio formats after switching off TV.

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I have had this problem since I purchased the Sonos Arc about a month ago and it is getting very frustrating.

I have a TCL 75C727 TV with the Sonos Arc connected in the eArc HDMI port and stream everything through an Nvidia Shield TV Pro. The TV is set to passthrough audio.

When I first start up everything the Sonos Arc is outputting the correct audio formats.

For Disney+ the app will show Dolby Atmos and Dolby Digital Plus 5.1 correctly depending on media.

For Netflix it is Dolby Digital Plus 5.1 and for Youtube it is Stereo PCM.

However once I turn off the Nvidia Shield and TV and turn everything on in a few minutes the only format that works correctly is the Dolby Atmos. All the other formats show up as either Dolby Multichannel PCM 5.1 or Dolby Multichannel PCM 2.0.

I have tried powering down the TV and the Shield but the problem only resolves when I power down the Sonos Arc and restart it and then the audio formats are correct again, until the next time I want to watch something.

Has anyone else had this issue with their setup and how did you resolve it.

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G

GCGQLDAnswer

Trending Lyricist I

Something interesting just happened. My daughter turned on the TV after being off all night and watched Netflix in 5.1 and the Arc is correctly playing DD+.

Now I need to work out which app maybe changing the Arc to 2.1 and then does not change back.

I’ll get back when I have more information.

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Corry P

Sonos Staff

Hi @GCGQLD

I’m glad to hear that things are at least satisfactory, if not ideal. You are correct - streaming services will supply compressed Atmos via Dolby Digital +, which can be carried over standard HDMI-ARC. Only exterior devices are ever likely to supply an uncompressed format, and they can often be told to send compressed streams instead.

Thanks for updating the thread.

"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein

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