5.1 not working when audio set to auto, atmos. Have to change audio to 5.1 to work correctly.

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5.1 not working when audio set to auto, atmos. Have to change audio to 5.1 to work correctly.

I know there are lots of topics on this but wanted to refresh to see if anyone has a fix yet. I have Sonos arc connected to eARC port of my LG. The audio formatting on my appleTV 4K is “auto, Dolby atmos”. If audio is in Dolby atmos everything is great. If the audio is 5.1 it is output as stereo PCM. I have to manually change the audio settings of appleTV to 5.1 for the audio to output correctly. Any fixes for this yet? Is it an appleTV issue, Sonos issue, or both?

Apple TV 4K

Posted on Jun 12, 2021 6:46 PM

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Answer 1

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Urquhart1244

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143,022 points

Jun 13, 2021 3:24 AM in response to Jacketsfan33

Note that ‘Auto’ is intended to output PCM Multichannel (up to 7.1). PCM does not indicate stereo.

Some source streams may be stereo though, and then that will be output as stereo.

For Home Sharing content there may be other issues at play, which wouldn’t apply to online streaming services.

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Answer 2

Jacketsfan33 Author

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Jun 13, 2021 4:12 AM in response to Urquhart1244

For example, Netflix notes a program to be in Dolby 5.1. When auto audio selected in appleTV the output Sonos displays is stereo PCM. When I change audio to 5.1 in appleTV the same program now displays in Sonos as Dolby 5.1 with noticeable sound difference. So I’m not sure if it’s an appleTV issue or Sonos issue.

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Answer 3

Jul 18, 2021 9:00 AM in response to Jacketsfan33

I am having the same problem. All content in 5.1 outputs to multi channel stereo, when Dolby atmos and auto are enabled. 5.1 comes out in Dolby when change format is enabled, but that disables Dolby atmos. Am using a Sony bravia a8h and speakers connected to a marantz nr1710. The Apple TV is connected to the receiver.

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Answer 4

Aug 14, 2021 2:25 AM in response to Appleproductuserr

Same problem here. Apple TV 4K connected to TV (Panasonic HZ1000) and TV to av receiver via HDMI (ARC) and the output is always stereo PCM if audio format is set to ‘auto’. If Apple TV is connected to av it works correctly. The problem is that my av receiver doesn’t support 4K so I have to connect Apple TV to Tv and force 5.1 output. I hope Apple will fix this bug!

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5.1 not working when audio set to auto, atmos. Have to change audio to 5.1 to work correctly.

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