Logitech Z623 Complete Setup Manual page 6

ADJUST THE VOLUME
1 To adjust the volume on the speakers, use the middle knob on the front of
the right speaker Turn clockwise (counterclockwise) to increase (decrease)
the volume
ADJUST THE BASS
2 Adjust the bass level by turning the bass control knob on the right speaker
Turn bass knob to the right for deeper bass or to the left for less bass
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www.logitech.com/support/Z623
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BASS
English 6