Harman Kardon Citation Amp Owner's Manual page 37

Audio Sync Delay
If the audio and video are not synchronized, move the slider to
delay the audio to match the video.
Surround Channel Level
Move the sliders to adjust the left and right surround sound
volume respectively.
You can also use the SURROUND -/+ buttons on the remote
control to adjust the left and right surround sound volume at the
same time.
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