LG SN9YG - 5.1 & PCM/Dolby Digital Query


Novice Member

I’m hoping someone could help me.

So I have set up a new LG SN9YG sound bar along with my new LG C1, which have connected via eARC. I have turned on all the relevant setting in the tv sound menus to ensure eARC is being used & have the bar set to Sound AI Pro mode and everything seems to be working amazingly especially Dolby Atmos through the likes of Netflix.. However I have one query regarding Dolby 5.1 transmission.

So for example Amazon Prime has lots of content in HDR & 5.1 sound, however if I play this the sound only comes out of the front left & right speaker and does not utilise the other speakers to offer 5.1 surround effect which I thought would happen? Especially as using the AI feature? I can manually make it happen by putting the bar in movie mode, but yeah my understanding was shows broadcast in 5.1 would also utilities the whole bar? Have I miss understood something or am I doing something wrong?

Also should I be using PCM, Dolby Digital or Auto for this setting on the tv?

Help & Support would be very much appreciated, Thank you :)

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