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Morning all .  Can anyone help. 

I have a Sonos arc connected to my lg c1 via the arc hdmi. A Panasonic uhd player via hdmi and  ps5 in other HDMI.  TV streams Atmos from say Disney no problem and atmos films on the player again no problem. However when I put an older film in. Like say the other day was watching the 4k of death becomes her. I was only getting stereo pcm. I have tried looking through endless threads on here and changed various settings but still only get pcm. Surely my older films should at least be able to do 5.1 . Anybody got any help at all 

 

If you look up “Death Becomes Her” on the IMDB site and scroll down to the “Thch Specs” you will see that it is in “Dolby Stereo” and not surround or Atmos. This is why you get PCM stereo for this film and others show a different format.

https://www.imdb.com/title/tt0104070/?ref_=tt_mv_close

Usually the DVD box has tiny print giving the supported formats.

 

I thought it would do some form of dts hd. 5.1 as the website pic above. Apologies all if wasted your time

Supported formats here: https://support.sonos.com/en-us/article/supported-home-theater-audio-formats?language=en_US

 

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