Bad surround in my plex

Hi all,
When playing a movie with 5.1 , dialogue it is muted. After adding the volume, the dialog is heard silently and from bass. Only dialogues from front speakers. When someone speaks from behind, it’s normally loud. All the effects, bass are fine and play as they have.
After I turn on “VIRTUAL” mode on my home theatre audio is OK.

How to solve it?

PS3, optical cable, lg home theatre

Thank you all for answers.

solved

please close.

Out of interest, what did you do / change to solve it?

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