34
G
CONTROLS & ADJUSTMENTS
Sequence of Adjustments
Depending on amplifier type (2-channel, 4-channel or a combination
thereof), amplification mode (fullrange, highpass or lowpass) and connec-
ting mode (stereo or mono bridged) it is possible, that only part of the
adjustments described in this manual section are applicable to your in-
dividual car audio system.
If you are using your amplifier in conventional fullrange mode (eg. with
a soundboard), you may skip paragraph "1. Crossover Frequency Set-
tings" and go directly to "2. Sensitivity Adjustments".
In case you are using your new amplifier(s) in a multi-channel ampli-
fier system with highpass-filtered front and/or rear satellites and/or a
lowpass-filtered subwoofer, we recommend you to read the complete
section "Controls & Adjustments" before you start adjusting any of the
frequency or level controls.
However, it is recommended to keep to the practical and logical se-
quence of the frequency and level adjustments as described in this ma-
nual section.
Before you start with the control settlings and adjustments please
also note the related sections on "Connections & Controls" and the
respective "Connecting Diagrams" in this manual.
Active Highpass and Lowpass Filtering
The AXTON models C202, C402 and C502 offer you not only conven-
tional fullrange amplification: You also have the choice of high-pass or
lowpass amplification mode, enabling you to drive your car audio spea-
kers in the specific frequency range where they will perform best.
In HIGHPASS mode dashboard, door and rear shelf speakers (usually bet-
ween10 and 16 cm diameter) - which will never have a good low-end
bass reproduction anyway - will only be playing in the midbass and
mid/high frequency range. This so-called highpass filtered or HPF am-
plification mode also puts less electrical and mechanical 'strain' on your
coaxials and component speaker systems, resulting in an increased
power-handling capacity.
In LOWPASS mode the respective speaker output will only receive low-
pass filtered (LPF) signals resulting in the subwoofer only playing in the
low-end bass frequency range without any unwanted 'smearing' into
the mid/high frequencies.
1
CROSSOVER FREQUENCY SETTINGS
(FILTER) FREQ. HIGHPASS & LOWPASS
Before you can effect the respective input sensitivity / gain adjustments
(LEVEL) you first have to select the system appropriate crossover fre-
quencies for all speakers connected by way of the respective filtering
controls marked FILTER FREQ. or HIGHPASS and LOWPASS FREQ. (de-
pending on amplifier model). For best results all crossover settings
should usually be selected by ear rather than by some 'abstract' fre-
quency value!
Do not forget to set the amplification mode switches into the re-
quired position, i.e. HIGHPASS or LOWPASS! Any frequency setting
on the filtering controls will be inactive if the amplification mode switch
remains in position FULL!
For appropriate crossover frequency selection, all tone controls
(Bass, Mid, Treble, Sub) and all fader and balance controls etc.
on the head unit have to be brought to their neutral or center
position! The "Loudness" function should also be deactivated.
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