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2
Sensitivity Adjustments and System-
Matching GAIN (CH1+CH2, CH3+CH4)
To reach a maximum of dynamic response from your individual head
unit / amplifier / speaker combination, it is important to set the res-
pective input sensitivity controls (GAIN) correctly. Firstly the sensiti-
vity determines the actual signal-to-noise ratio. Secondly hand the sen-
sitivity also controls the maximum distortion-free sound pressure level
(SPL) possible with your specific car audio system.
It is recommended to effect the sensitivity adjustments and system LE-
VEL matching in the same sequence as listed below:
Set all tone controls (Bass, Mid, Treble, Sub) on the head-unit as
well as all fader and balance controls to neutral. The "Loudness"
option should be in the "Off" position, too.
Turn the GAIN control (s) of the connected amplifier(s) to its/their
lowest positions.
Turn-on your head-unit and turn-up the volume control to appro-
ximately 3/4 of full volume and start playing a well recorded, dyna-
mic piece of music.
For 2- or 4-channel fullrange operation, only: Slowly turn up the
GAIN control until you can hear distorted sounds. Slowly decrease
the LEVEL control to the point where the distortions will have dis-
appeared. The system adjustment is completed.
For 3- or 5-channel operation (2x) stereo + mono sub, only:
Slowly turn up the GAIN control until you can hear distorted bass so-
unds. Slowly decrease the GAIN level control to the point where
the distortions will have disappeared.
Now you reduce the main volume level on the head-unit to medi-
um listening level.
For 3- or 5-channel operation (2x) stereo + mono sub, only: Start
turning up the
GAIN 1 + 2 control clockwise until you have reached
good tonal balance between the (front) satellites and the subwoofer.
A slight attenuation of the bass range should be preferred, as this will
be compensated later by normal driving noises. For 3-channel ope-
ration the system adjustment is completed.
For 5-channel operation 2x stereo + mono sub, only: Start turning
up the
GAIN (REAR) control clockwise until you feel to you have re-
ached an appropriate 'rear fill' in the back of the car, so that the over-
all in-car sound becomes smooth and homogenous.
Finally, you may want to do some fine-tuning on the different
highpass and lowpass frequencies selected. It is recommended to
start fine-tuning with the subwoofer
(LOWPASS FREQ.) Then pro-
ceed - if necessary - with the front satellites and finish the adjust-
ments with the rear satellites (both HIGHPASS FREQ.).
IMPORTANT: All advice on controls and adjustments of this ma-
nual section is based on the assumption that you are also thoroug-
hly acquainted with all the requirements and features of the
entire audio equipment – especially the head-unit and the spea-
kers – connected to this amplifier!
C208 408 508 Manual UK-D-F 23.07.2003 19:30 Uhr Seite 36
36


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