CITROEN C-ZERO Handbook page 122

®
Bluetooth audio system
QUESTION
There is a difference in sound quality between
the different audio sources (radio, CD, etc.).
When changing the settings for treble and bass,
the ambience setting is deselected.
When changing the ambience setting, treble
and bass are reset to zero.
When changing the balance setting, distribution
is deselected.
The reception quality of the tuned radio station
gradually deteriorates or the stored stations are
not working (no sound, 87.5 MHz is displayed...).
10
RESPONSE
For optimum sound quality, the audio settings
(volume, bass, treble, ambience, loudness)
can be adapted to the different sound sources,
which may result in audible differences when
changing source (radio, CD, etc.).
Choosing an ambience imposes settings for
treble and bass. Modifying one without the other
is only possible with a personalised ambience.
Choosing the "driver" distribution setting
imposes a balance setting.
The vehicle is too far from the transmitter of
the station or no transmitter is present in the
geographical area.
The surroundings (hills, buildings, tunnels,
underground car park, etc.) are blocking
reception, including in RDS tracking mode.
The aerial is missing or has been damaged (for
example when going through a car wash or into
an underground car park).
https://www.automotive-manuals.net/
SOLUTION
Check that the audio settings (volume, bass,
treble, ambience, loudness) are adapted to
the sources being listened to. It is advisable to
set the AUDIO functions (bass, treble, front-
rear balance, left-right balance) to the middle
position, select the musical ambience and set
the loudness correction to the "Active" position
in CD mode or to the "Inactive" position in radio
mode.
Modify the treble and bass settings or the
ambience setting to obtain the desired sound
quality.
Modify the balance or distribution settings to
obtain the desired sound quality.
Activate the RDS function and search for the
station again to enable the system to check
whether there is a more powerful transmitter in
the geographical area.
This phenomenon is normal and does not
indicate a failure of the audio equipment.
Have the aerial checked by a CITROËN dealer.