Operation Manual

38
3 Connect the USB storage device to this
product.
4 Turn the source off.
 Refer to Selecting a source on page 9
5 Display the “System” setting screen.
 Refer to Displaying the “System” setting screen on page
35
6 Touch [System Information].
7 Touch [Firmware Update].
8 Touch [Continue] to display the data transfer
mode.
p Follow the on-screen instructions to finish updating the
firmware.
p
This product will reset automatically after the firmware
update is completed if the update is successful.
p
If an error message appears on the screen, touch the display
and perform the above steps again.
Displaying the “Audio” setting
screen
1 Press .
2 Touch , and then .
The “Audio” setting screen appears.
Using fader/balance adjustment
1 Display the “Audio” setting screen.
 Refer to Displaying the “Audio” setting screen on page 38
2 Touch [Fader/Balance].
p Only the balance can be adjusted when “Network Mode” is
selected as the speaker mode. Touch [Balance] and skip to
step 4.
3 Touch or to adjust the front/rear speaker
balance.
p Set “Front” and “Rear” to “0” when using a dual speaker
system.
4 Touch or to adjust the left/right speaker
balance.

You can also set the value by dragging the point
on the displayed table.
Switching sound muting/
attenuation
You can automatically mute or attenuate the AV source volume
and the iPhone application volume when the navigation outputs
the guidance voice.
1 Display the “Audio” setting screen.
 Refer to Displaying the “Audio” setting screen on page 38
2 Touch [Mute Level].
3 Touch the item.
 ATT (default):
The volume becomes 20 dB lower than the current volume.

Mute:
The volume becomes 0.

Off:
The volume does not change.
Adjusting source levels
SLA (source level adjustment) lets you adjust the volume level of
each source to prevent radical changes in volume when switch-
ing between sources.
p
Settings are based on the FM tuner volume level, which
remains unchanged.
p
This function is not available when the FM tuner is selected
as the AV source.
1 Compare the FM tuner volume level with the
level of the source.
2 Display the “Audio” setting screen.
 Refer to Displaying the “Audio” setting screen on page 38
3 Touch [Source Level Adjuster].
4 Touch or to adjust the source volume.
p If you directly touch the area where the cursor can be moved,
the SLA setting will be changed to the value of the touched
point.
p
“+4” to “–4” is displayed as the source volume is increased
or decreased.
p
The default setting is “0”.
Using the auto level control
This function corrects automatically the audio level difference
between the music files or the sources.
1 Display the “Audio” setting screen.
 Refer to Displaying the “Audio” setting screen on page 38
2 Touch [Automatic Level Control].
3 Touch the item.
 Off (default):
Turns the auto level control setting off.

Mode1:
Corrects a little the audio level difference between the music
files or the sources (for the narrow dynamic range audio
signal).

Mode2:
Corrects widely the audio level difference between the
music files or the sources (for the wide dynamic range audio
signal).
Adjusting loudness
This function compensates for deficiencies in the low-frequency
and high-frequency ranges at low volume.
The default setting is “Off”.
Audio adjustments
< CRB4721-B >
System settings Audio adjustments