Operation Manual

36
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