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F
COnTrOlS & ADJUSTmEnTS
Sequence of Adjustments
Depending on amplifier type (mono, 2-channel, 4-channel,
5-channel or a combination thereof), amplification mode
(fullrange, highpass or lowpass) and connecting mode (ste-
reo or mono bridged) it is possible, that only part of the
adjustments described in this manual section are applicable
to your individual car audio system.
If you are using your amplifier in conventional fullrange
mode (eg. with a soundboard), you may skip paragraph
"1. Crossover Frequency Settings" and go directly to
"2. Sensitivity Adjustments".
In case you are using your new amplifier(s) in a multi-channel
amplifier system with highpass-filtered front and/or rear satel-
lites 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 stick to the practical and
logical sequence of the frequency and level adjustments as
described in this manual section.
Active Highpass and lowpass Filtering
The AXTON models A1390, A2090/2190, A490 and 480-250 do
not only offer conventional fullrange amplification: You also
have the choice of highpass or lowpass amplification mode,
enabling you to drive your car audio speakers in the specific
frequency range where they will perform best.
All manuals and user guides at all-guides.com
In HIGHPASS mode, the dashboard, door and rear shelf spea-
kers (usually between10 and 16 cm diameter) - which do not
give you strong bass reproduction anyway - will only be
playing in the midbass and mid/high frequency range. This
so-called highpass filtered or HPF amplification 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 re-
ceive 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
Before you can effect the respective input sensitivity / level
adjustments (GAIN) you first have to select the system ap-
propriate crossover frequencies for all speakers connected by
way of the respective filtering controls marked HIGHPASS and
LOWPASS (depending on amplifier model). For best results
all crossover settings should usually be played by ear rather
than by guessing a frequency value!
Do not forget to set the amplification mode switches into
the required position, i.e. HigHPASS or lOWPASS! Any fre-
quency setting on the filtering controls will be inactive if the
amplification mode switch remains in position FULL!
CrOSSOVEr FrEQUEnCy SETTingS
(FilTEr) FrEQ. HigHPASS & lOWPASS
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