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Satellite rule 1
The better sounding satellite system should
always be installed in the front of the vehicle .
Satellite rule 2
Based on identical speaker diameters and quality
of the front and rear satellites, the crossover cut-in
frequency of the front satellites should usually
be set lower than the highpass frequency of
the rear satellites .
The LPF / LOWPASS SUB cut-off frequency for the subwoofer should
usually be set in between 50 and 90 Hz . Adjust the LOWPASS SUB control
in such a way that the bass reproduction will be precise and rich, while
still delivering a good and solid low-end bass .
Subwoofer
Generally, setting the LPF lowpass cut-off
guideline 1
frequency too low will result in a weak and
uncontoured bass response . Setting the LPF
control too high tends to give the subwoofer
a ‚booming' sound .
Subwoofer
The subsonic filter helps to prevent smaller
guideline 2
subwoofers from being mechanically overdriven
at high playback levels (i .e . 8" and 10" models) .
The correct subsonic frequency setting has to be
determined empirically . If your subwoofer has
sufficient power handling (30cm model), you can
set the pot to its 20Hz position .
High- & lowpass
When selecting the high- and lowpass frequencies
system tip
of a sound system, it can be advantageous to
‚leave a gap' between the subwoofer LPF cut-off
frequency and the satellite HPF cut-in frequencies .
A470-170 Manual DEF.indd 23
2
Sensitivity Adjustments and System Matching
GAIN FRONT, REAR and SUB
To reach a maximum of dynamic response from your individual head unit
/ amplifier / speaker combination, it is important to set the respective
input sensitivity controls (LEVEL) correctly . On the one hand the sensi-
tivity 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
GAIN 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 .
™ Set all 3 GAIN controls of the A470-170 to their lowest position .
™ Turn-on your head-unit and turn-up the volume control to approxi-
mately 3/4 of full volume and start playing a well recorded, dynamic
piece of music .
™ Slowly turn up the GAIN control of 5CH until you can just hear
distorted bass sounds . Slowly decrease the GAIN SUB control to the
point where the distortions have disappeared .
™ Now you reduce the main volume level on the head-unit to a
medium listening level .
™ Start turning up the FRONT GAIN control (1CH/2CH) clockwise until
you have reached a 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 by normal driving noises .
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12.09.2007 7:53:19
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