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5. CROSSOVER ADJUSTMENTS
5.1 SELECTING THE OPERATION MODE
You must select and set the appropriate operation mode before you can attempt any of the cross-
over frequency and gain adjustments. This setting depends on the speaker system connected to
the amplifier. Select the appropriate operation mode as follows:
➡
Select HIGHPASS, if the speaker system is a component-, coaxial- or triaxial- type.
➡
Select BANDPASS in case of a kickbass system, or a subwoofer system.
Selecting the appropriate operating mode for each channel pair makes sure, that the speakers
connected to the amplifier outputs will only receive filtered signals, so the speakers will only have
to operate in the frequency band they can reproduce best.
Note:
If you own a head-unit, that features an integrated DSP controlled active crossover, it is
recommended to use the DSP based crossovers of the headunit. In this case, you have to set
the operation mode slide switch(es) to FULL(range)!
5.2 HIGHPASS CROSSOVER FREQUENCY ADJUSTMENT
For satellite speakers, you always select the “HPF” mode, to cut off the bass content in the music
signal. Highpass filtering will take away unnecessary mechanical and electrical ‘strain’ from the
connected coaxial or component speaker systems, as they cannot reproduce strong and low
bass signals anyway. Depending on the actual cone surface, voice-coil diameter and the rated
power handling of the installed ‘satellite’ speakers, it is recommended to set the high-pass cross-
over frequency point between 50 and 150 Hz, using the „HPF“ potentiometer.
FRONT DOOR SATELLITE SPEAKER SYSTEM („HPF” MODE) X-OVER FREQ.
13 cm 2-way Component System
80 - 110 Hz
16 cm 2- or 3-way Component System
50 - 80
Hz
REAR SATELLITE SPEAKER SYSTEM („HPF” MODE)
X-OVER FREQ.
13 cm 2-way Coaxial or Component System
100 - 120 Hz*
16 cm 2-way Coaxial or Component System
100 - 120 Hz*
15x23 cm (6x9”) or 18x25 cm (7x10”) Triaxial Speaker System
100 - 120 Hz*
* When a subwoofer is part of the audio system install.
5.3 LOWPASS CROSSOVER FREQUENCY ADJUSTMENT
Select “BPF”, to activate the lowpass filter of the integrated electronic crossover.
Note:
Before you attempt to adjust the lowpass crossover frequency, you must set the subsonic
highpass filter control (when “BPF” mode is selected) to its lowest position (10 Hz).
Note:
For the 2- and 4-channel amplifier models, the bandpass (“BPF”) mode will engage the
HPF potentiometer as subsonic highpass.
The LOWPASS cut-off frequency setting depends on some variables, and each vehicle is differ-
ent! As a rule of thumb, settings in a range between 60 to 90 Hz will render best sonic results.
This setting is mostly a matter of taste, and should therefore be ‘played by ear’.
NOTE:
In general, setting the lowpass crossover frequency too low, will result in a weak and
muddy sounding bass, while setting this crossover frequency too high will result in a ‘booming’
bass sound and reduced low end extension.
