LG S90QY Owner's Manual page 18

Input
SPORTS
Realistic sound like in a stadium
2.0 channels
5.1 channels
7.1 channels or more
7.1.4 channels
MUSIC
Sound enriched with MERIDIAN technology
2.0 channels
5.1 channels
7.1 channels or more
7.1.4 channels
18
Rear speakers not connected
DTS
Other
Sound Effects
Output
Rear speakers connected