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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 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 SUBSONIC, HIGHPASS and LOWPASS
FREQ. (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 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!
G
CONTROLS & ADJUSTMENTS
Sequence of Adjustments
Depending on amplifier type (mono, 2-channel, 4-channel or a com-
bination thereof), amplification mode (fullrange, highpass or lowpass)
and connecting mode (stereo 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 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
manual section.
Active Highpass and Lowpass Filtering
The AXTON models C109, C209, C409 and C509 do not only offer con-
ventional fullrange amplification: You also have the choice of high-pass or
lowpass amplification mode, enabling you to drive your car audio speakers
in the specific frequency range where they will perform best.
In HIGHPASS mode dashboard, door and rear shelf speakers (usually
between10 and 16 cm diameter) - which do not give you strong bass
C109-509 Manual DEF.indd 38C109-509 Manual DEF.indd 38 15.02.2005 15:30:34 Uhr15.02.2005 15:30:34 Uhr
38


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