Mazda MX-5 MIATA 2003 Manual page 138

Interior Comfort
Audio System
Automatic Level Control (ALC)
The automatic level control is a feature
that automatically adjusts audio volume
and sound quality according to the vehicle
speed.
The volume increases in accordance with
the increase in vehicle speed, and
decreases as vehicle speed decreases.
The following seven modes are available.
Select the desired mode according to use.
Mode
ALC does not
operate.
Use when the
convertible
top is closed.
Three levels
are available.
Use when the
convertible
top is open.
Three levels
are available.
6-20
Volume
Use
change
No change
Minimum
Medium
Maximum
Minimum
Medium
Maximum
Turn the audio control knob to select the
desired mode. The selected mode will be
indicated.