Hi @nthorbur 

Welcome to the Sonos Community!

Yes. Ideally, Arc would like an eARC port, but will still work with standard HDMI-ARC. The Arc can play compressed Atmos (Dolby Digital +), Dolby Digital, DTS and PCM over HDMI-ARC (assuming the TV supports them - PCM is supported by all, and Dolby Digital is supported by a large majority of TVs). You will not be able to play uncompressed Atmos (MAT) or Multichannel LPCM, however, as these require eARC. 

Atmos playback requires the sound-bar, TV, source device (if present) to support Atmos and the content itself needs to be recorded in that format. Uncompressed Atmos is only available on physical media (like BluRay), so if your main source is Sky Q or streaming, the lack of eARC (and thus uncompressed Atmos) isn’t an issue.

You will need to enable SimpLink in the LG TV’s options.

On the WSATM1 product page, it mentions ‘universal compatibility with SANUS TV mounts and other TV mount brands, VESA Patterns, and for most TV's 50"- 90"’, which is a Yes.

That is exactly why the community is here, and you are very welcome!

I hope this is all clear - if you have any further queries, please don’t hesitate.

@nthorbur 

I can confirm that all formats mentioned work well I have the LG b8 version of tv and it passes through dolby atmos compressed (dd+) and shows as atmos 

Dts also works I think newer lg TVs don't support dts but yours should 

As for sky q I have no experience with it  I got rid of  my tv licence 15 years ago and only watch streaming media and blurays I have seen posts regarding some issues with sky and solutions to them on the forum 

Thanks for the prompt  and clear response.

Potential setup will be:

Sonos Arc to LG TV via HDMI Arc input 

LG Tv to Sky Q box via HDMI input (as current)

Pair Sonos to Tv (Assume that Tv and Sky already paired). 

You will need to enable SimpLink in the LG TV’s options.

Assume Sky channels sound controlled by soundbar, netflix either watch via Sky or Tv App and music played through TV app all sound output from the Sonos.

If that works then i am going to invest - option to upgrade TV later on and time for an ARC/EARC adaptor for Tv to be invented.

Can old ears tell the difference between Arc and eArc sound quality

@nthorbur

My 65 year old ears are happy

When I get the urge to upgrade the TV I put a reference bluray on and remember that I will lose dts if I get a newer lg tv

I would recommend getting 2 rears and a sub before a tv if you are happy with the picture 

Hi @nthorbur 

This is all good, though I recommend enabling Simplink before connecting the Arc.

You may not want to use TV app for music - it depends on the app, though. If you are thinking of playing music from YouTube (not YouTube Music) then you’d be better off using the Sonos app on your phone - the TV doesn’t need to be on, and the audio quality will be better.

There are a few adaptors that will provide an eARC connection when a TV will not. They are not cheap, however, and see next answer.

I doubt young ears could, if they were not trained in what to listen for. And they’d probably need a direct comparison, switching back and forth between the formats to be able to tell.

I hope this helps.