Under song playing status, the first long press the “4;TONE” button (highlighted in red) is for bass adjustment. The LED light will be changed to WHITE.
Rotate the volume control knob left/right to turn up/down the volume for bass accordingly within 4s after button press. Or it would switch to the normal volume control.
NOTE: The LED will be flashed as indicator as rotating to the MIN or MAX.
WARMING: PLEASE PAY MORE ATTENTION TO ADJUST BASS VOLUME AVOIDING NOISES AS LP PLAYING!
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