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. On the one hand the
sensitivity determines the actual signal-to-noise ratio. On the other
hand the sensitivity 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
LEVEL 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 ap-
proximately 3/4 of full volume and start playing a well recorded,
dynamic piece of music.
™ For 2- or 4-channel fullr
ange 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 oper
ation (2x) stereo + mono sub, only:
Slowly turn up the GAIN SUB control until you can hear distorted
bass sounds. Slowly decrease the GAIN SUB control to the point whe-
re the distortions will have disappeared.
™ Now you reduce the main volume level on the head-unit to me-
dium listening level.
™ For 3- or 5-channel oper
ation (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 oper
ation 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 proceed -
if necessary - with the front satellites and finish the adjustments with
the rear satellites (both HIGHPASS FREQ.).
™ If you have a sound system with soundboard the level adjust-
ment procedure is basically the same as with 2- or 4 channel fullrange
operation. In case of a 4-channel operation with soundboard and
front fullrange speakers or front highpass satellites, it is common
practice to adjust the (main) level of the soundboard first and to
get a 'front fill' according to personal preference at the end.
IMPORTANT: All advice on controls and adjustments of this manual
section is based on the assumption that you are also thoroughly
acquainted with all the requirements and features of the entire
audio equipment - especially the head-unit and the speakers -
connected to this amplifier!
C202 402 502 (D+E) 30.04.2001 10:14 Uhr Seite 36
