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I have just bought a Sonos beam gen 2 which I’ve added in to my home set up paired with an OLED LG C2 tv and a Roku 4k steaming stick.

I have the beam connected by the arc port on the LG and then the Roku stick by an additional HDMI port.

i can get Dolby atmos and Dolby 5.1 fine on the LG’s native  apps but only get stereo PCM for the same content on the Roku.  have tweaked all the relevant settings on the LG  ie pass through etc as well as custom digital output to Dolby digital on the Roku stick.

I had read that the Roku stick was capable of Dolby Atmos so I’m presuming there must be some setting on the LG which I’m missing. It’s not a deal breaker having no Dolby atmos on the Roku as I can get it on the native apps but would be better if I could.

Hi ​@Harmonia0_0 

Welcome to the Sonos Community!

Sorry to hear of this issue you have been having in trying to get Atmos playing via your Roku device.

As far as I can ascertain (from Reddit), your LG TV should have no issue with passing Atmos audio from your Roku to your Beam (Gen 2). The fact that it works with TV apps suggest that most - if not all - of the TV’s settings are correct.

It is not unheard-of for some apps on some devices to not play certain formats, however - it may be worth Googling the apps you are using, in conjunction with Roku and Atmos, leaving “Sonos” out of the search to make sure you get as many results as possible.

If you have not enabled eARC on the TV’s settings, please do so. The Roku will be receiving Dolby Digital + (Atmos), which does not require eARC, but if it is decoding the audio itself, perhaps it is outputting lossless Atmos (MAT) which requires eARC. I am not familiar with the device, but even so, this is a long-shot - but worth trying.

If I recall correctly (and to be clear, I might be confusing LG with another manufacturer), there may be audio settings for each input on the TV - please check those for the input that the Roku is connected to.

Do you have any other devices you can test (a Blu-ray player, for example)?

You may have better luck contacting LG support for clarification.

I hope this helps.

 

Hi, thanks for your suggestions. Have Actually managed to solve it. Changed Roku digital audio setting from  custom back to auto …..Dolby atmos and 5.1 is now enabled. 

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