Toyota 2015 Corolla Owner's Manual page 274

Optimal use of the multimedia system
On the "Sound Settings" screen, sound quality (Treble/Mid/
Bass), volume balance can be adjusted.
How to adjust the sound settings and sound quality
Select "-" or "+" to adjust
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the treble, mid or bass to
a level between -5 and 5.
Select "Front" or "Rear" to
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adjust the front/rear audio
balance.
Select "L" or "R" to adjust the
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left/right audio balance.
The sound quality level is adjusted individually
■
The treble, mid and bass levels can be adjusted for each audio mode sepa-
rately.
COROLLA_TMMMS_TMMC_U (OM12F00U)
5-13. Using the Multimedia system
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