LG CineBeam PU700R-GL Owner's Manual page 113

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[Equalizer]
(Q. Settings) →
You can adjust the sound by increasing or decreasing the output of the specific
frequency range of the voice signal.
The option can be enabled if [Sound] → [Select Mode] is set to [Standard].
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This setting only applies to the internal speakers of the Projector or HDMI (ARC)
connected devices that support [Sound Mode Share].
Applying the Current Sound Settings to All Inputs
(Q. Settings) →
The settings you specify only applies to the currently selected input mode. To apply
your current sound settings to all input modes, select [Apply to All Inputs].
Initializing Sound Settings
(Q. Settings) →
Changes the detailed sound settings of the [Standard] mode to default.
This setting only applies to the internal speakers of the Projector or HDMI (ARC)
connected devices that support [Sound Mode Share].
→ [Sound] → [Advanced Settings] → [Equalizer]
→ [Sound] → [Advanced Settings] → [Apply to All Inputs]
→ [Sound] → [Advanced Settings] → [Reset]