Sound setting only apply to TV mode, either LPCM 48/16 or Dolby 2.0 signal on optical port. Those sound setting doesn’t affect surround 5.1 mode and CD mode.
Set speakers treble level, total 15 level of 0.5dB each step.
Set subwoofer(s) level, total 15 level of 1dB each step.
Speaker sound timbre
Select speaker sound timbre : Natural, Vivid, Vocal and Comfort
Select pseudo LFE channel bass effect : Off, Soft, Comfort, Strong
TV virtual 5.1 sound
Go to speaker setup page, enable TV play speaker. You can enable center speaker to have TV 3.1 sound, or enable rear speaker to have TV 5.1 sound.