LG S77S Owner's Manual page 11

Speaker sound based on input channels
Sound Effects
Input Output
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
MUSIC
You can enjoy better sound optimised for music.
2.0 channels
5.1 channels
7.1 channels or more
7.1.4 channels
CINEMA
Cinematic 3D sound
2.0 channels
5.1 channels
7.1 channels or more
7.1.4 channels
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