Loud Mode - Fujitsu CD5425 Owner's Manual

[AUDIO CONTROL] button
Turn the [AUDIO CONTROL] button to the left or right.
Turn to the right: Increases the SVC setting value.
Turn to the left:
The volume difference can be set within a range of -10 to +20.
If the battery terminals have been disconnected because of a reason
such as vehicle maintenance, the SVC settings will return to their
default values. If this happens, you will need to make the settings
again.

LOUD Mode

The loudness control may be turned on to emphasize low and high
frequencies at low volume levels.
Loudness compensates for the apparent weakness of low and high
frequencies at low volume by boosting the bass and treble levels.
Turn the [AUDIO CONTROL] button until the [LOUD ON] display
appears on the screen.
To disable the loudness feature, repeat the above procedure to display
the [LOUD OFF] indication.
Decreases the SVC setting value.
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Basic operation