CITROEN C4 Handbook page 182

FREQuEntlY-ASKED QuEStIOnS
The table below provides answers to the questions that are asked the most frequently.
QuEStIOn
There is a discrepancy in
sound quality between the
different audio sources
(radio, CD, CD changer
etc.).
The CD immediately ejects
or does not play back.
The CD player sound is
downgraded.
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A U D I O
AnSwER
To achieve an optimum listening quality, the
audio adjustments (Volume, Bass, Treble,
Ambiance, Loudness) can be adapted to each
of the different sound sources, which can
produce audible shifts when you change the
source (radio, CD, CD changer etc.).
The CD is the wrong way up, is unplayable,
does not contain audio data or contains an
audio format that the radio cannot play back.
The CD is protected by an anti-pirating
protection system unrecognised by the radio.
The CD being used is scratched or of poor quality.
The radio adjustments (bass, treble,
ambiances) are unsuitable.
SOlutIOn
Check that the audio adjustments (Volume,
Bass, Treble, Ambiance, Loudness) are
adapted to the sources being listened
to. It is recommended that you should
adjust the AUDIO functions (Bass, Treble,
Front-Rear balance, Left-Right balance) to
the mid position, select the musical ambiance
"None", adjust the loudness correction to
the position "Active" in CD mode and to the
position "Inactive" in radio mode.
- Check that you have inserted the CD
the right way up in the CD player.
- Check the condition of the CD: the CD cannot
be played back if it is too damaged.
- Check the contents if it is a burnt CD:
refer to the advice given in the chapter
on Audio System.
- The radio's CD player cannot play back
DVDs.
- For reasons of poor quality, some burnt CDs will
not be played back by the audio system.
- The CD changer does not play back
MP3 CDs.
Insert only CDs of good quality and
keep them in good condition.
Return the treble and bass levels to 0,
without selecting any ambiance.