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CONTROLS & ADJUSTMENTS
A470-170 5-Channel System Amplifier
The AXTON A470-170 is a powerful 5-channel system amplifier . One
single A470-170 allows for an easy-to-install, speaker-dedicated ampli-
fication of a complete 5-channel speaker system, i .e . with two stereo
pairs of independently controlled satellite speakers (front and rear)
and one mono subwoofer .
The integrated, separately adjustable HIGHPASS and LOWPASS cross-
over filters of the A470-170 enable you to drive the connected speakers
in the specific frequency range where they will perform best .
Dashboard, door and rear shelf speakers of 10-16cm diameter will never
have a good low-end bass reproduction anyway . Therefore the A470-
170 front and rear satellite channels will only be playing in the midbass
and mid/high frequency range . This so-called highpass filtered or HPF
amplification mode aIso puts less electrical and mechanical ‚strain' on
the speaker units, resulting in an increased power handling capacity . The
subwoofer output will only receive lowpass filtered (LPF) signals resul-
ting in the subwoofer only playing in the low-end bass frequency range
without any unwanted‚ booming' into the mid/high frequencies .
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CROSSOVER FREQUENCY SETTINGS
HIGHPASS FRONT & REAR, LOWPASS SUB
Before you can effect the respective input sensitivity or gain LEVELs
you first have to select the system appropriate crossover frequencies .
For best results all crossover adjustments should usually be effected
by ear .
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A470-170 Manual DEF.indd 22
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 .
Depending on the actual cone surface area, voice-coil diameter and
the rated power handling of the ‚satellites' it is recommended to set the
high-pass crossover / cut-in frequency between 40 and 240 Hz .
If the satellite highpass frequency is set too low, the mid-bass repro-
duction will be increased, but at the same time the power handling
capacity of the satellites will decrease . If the highpass frequency is set
too high, the mid-bass reproduction will become ‚thinner' while the
power-handling capacity of the satellites will increase .
As a general guideline, below you find a practice-proven list for appro-
priate satellite HPF crossover / cut-in frequencies covering the most
widely used dashboard, door and rear-shelf speaker diameters:
Front Satellite Speakers
10 cm Ø Coaxials or 2-Way Compos
13 cm Ø Coaxials or 2-Way Compos
16 cm Ø Coaxials or 2/3-Way Compos
Rear Satellite Speakers
10 cm Ø Coaxials or 2-Way Compos
13 cm Ø Coaxials or 2-Way Compos
16 cm Ø Coaxials or 2/3-Way Compos
HIGHPASS FREQ .
90-120 Hz
80-100 Hz
70 - 80 Hz
HIGHPASS FREQ .
100-150 Hz
120-130 Hz
100-130 Hz
12.09.2007 7:53:19
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