Harman KARDON CITATION MULTIBEAM 1100 Owner's Manual page 33

Bass adjustment
You can adjust the bass level of the soundbar or subwoofer (if
connected): Bass -2, Bass -1, Bass 0, Bass +1, or Bass +2
• Press BASS on the remote control, or tap Audio -> Bass
on the touch screen and then swipe up or down to
adjust the bass level.
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