Dell Projector 4100MP - Manual (Page 40)

Degamma
Degamma can be adjusted between 1 and 4. Default setting is 3 (Recommended). Adjustment of the setting will change
the color performance of the display.
Audio Menu
Audio
Volume
l Press to decrease the volume.
l Press to increase the volume.
Treble
Control the higher frequencies of your audio source.
l Press to decrease the treble.
l Press to increase the treble.
Bass
Control the lower frequencies of your audio source.
l Press to decrease the bass.
l Press to increase the bass.
Mute