Audio Controls - Boss Audio Systems 638BA User Manual

Front panel controls

AUDIO CONTROLS

EQ Press repeatedly to cycle through five modes: POP M, ROCK M,
CLASS, FLAT M or DSP OFF.
SUB Press and hold to engage subwoofer output.
LOUD Press this button to increase the level of bass output.
8
MUTE Press to silence the receiver. Press again to
return to normal operation.
SOURCE By pressing this key, user can select AUX/TUNER/CD-
MP3/USB mode.
AUDIO BUTTON and ROTARY CONTROL Press the button repeatedly to
access Volume, Bass, Treble, Balance and Fader functions. Then use the
knob to adjust the selected function.
AUX IN