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Sensitivity Adjustments and
gain matching
To reach a maximum of dynamic response from your individ-
ual head unit/amplifier/speaker combination, it is important
to set the respective input sensitivity controls (GAIN) cor-
rectly. The sensitivity determines the actual signal-to-noise
ratio. Secondly, 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 approximately 3/4 of full volume and start playing a well
recorded, dynamic piece of music.
➜ Slowly turn up the gAin control of the channels driving
the subwoofer until you can hear distorted sounds. Slowly
decrease the LEVEL control to the point where the distor-
tions have disappeared.
All manuals and user guides at all-guides.com
➜ Start turning up the gAin l + r Front 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 com-
pensated later by normal driving noises. For 3-channel
operation the system adjustment is completed.
➜ Start turning up the gAin l + r rear control clockwise
until you feel to you have reached an appropriate 'rear
fill' in the back of the car, so that the overall 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 frequency. Then proceed – if necessary – with the
front satellites and finish the adjustments with the rear
satellites highpass frequencies.
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!
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