LG S80QY Owner's Manual page 16

Surround sound function OFF
When the surround sound function is turned off, sound is output differently from the connected speakers
depending on whether the Multi-channel Experience is turned on or off.
Multi-channel Experience ON
Input
AI SOUND PRO
Sound customised with artificial intelligence
2.0 channels
5.1 channels
7.1 channels or more
7.1.4 channels
STANDARD
You can enjoy optimised sound.
2.0 channels
5.1 channels
7.1 channels or more
7.1.4 channels
16
Sound Effects
Rear speakers not connected
Output
Rear speakers connected