Mazda CX-9 2007 Service Highlights page 522

AUTO LEVEL CONTROL (ALC) OPERATION
• The audio unit changes the volume automatically based on the vehicle speed signal sent from the instrument
cluster.
HIGHER VEHICLE SPEED
VEHICLE SPEED SIGNAL
LOWER VEHICLE SPEED
VEHICLE SPEED SIGNAL
• The ALC function is divided into four modes that can be used effectively to match the driving conditions.
Mode
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AUDIOPILOT OUTLINE
• Measures the driving noise level inside the vehicle with a specialized microphone, and the amplifier adjusts the
volume in accordance with the degree of noise masking the music component. Due to this, passengers can
enjoy music at a constantly perceived volume level regardless of the noise level.
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09-20–12
ENTERTAINMENT
AUDIO UNIT (BASE UNIT)
ALC POWER
CIRCUIT AMPLIFIER
AUDIO UNIT (BASE UNIT)
ALC POWER
CIRCUIT AMPLIFIER
ALC function cancelled
Outside road noise low
Outside road noise slightly high
Outside road noise high
SPEAKER
HIGHER VOLUME
SPEAKER
NORMAL VOLUME
Condition
id092000106800
acxuun00000364
id092000107000