Subaru 2015 BRZ Owner's Manual page 200

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Setting the Automatic Sound Levelizer (Only for type B)
The Automatic Sound Levelizer (ASL) function detects the noise level
inside the vehicle as it changes according to the driving speed and road
conditions, and automatically increases the audio volume when the
noise increases.
1
On the Sound Settings screen, touch
(Mid), (Low) or
Mid Low
• High (High):
Set the sensitivity for detecting noise inside the vehicle to High.
• Mid (Mid):
Set the sensitivity for detecting noise inside the vehicle to Mid.
• Low (Low):
Set the sensitivity for detecting noise inside the vehicle to Low.
• Off (Off ):
Cancel the ASL setting.
• After completing the adjustment, touch
adjusted settings and return to the previous screen.
(High),
High
(Off ) in ASL.
Off
to save the
Basic Operation
Audio and Visual 199