JVC LT-42WX70EU - Manual (Page 181)

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Changing the settings :
Sound
Sound
Bass
Adjusts bass tone.
■ –6 – +6 (Weaker ↔ Stronger)
Treble
Adjusts treble tone.
■
–6 – +6 (Weaker ↔ Stronger)
Balance
Adjusts sound balance.
■
L10 – 10R (To the left ↔ To the right)
Auto Volume Control
Turns down the volume automatically when an excessive strong sound
signal is input.
■
On / Off
Lip Sync
Adjusts the delay time of sound.
■
–3 – +3 (The sound starts earlier ↔ The sound starts later)