Apple AppleVision 1710AV - Manual (Page 89)

10 Adjust gain as desired.
Use the Display’s Sound Input Port Gain slider in the AppleVision Setup
control panel.
Note: When you attach sound equipment (such as an audio CD player) to the
AppleVision 1710
AV Display and use the AppleVision 1710 AV speakers, gain
settings of -10 or 30 produce low gain and gain settings of 0 or 40 produce
high gain to the speakers.
11 Close the AppleVision Setup control panel.
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