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CROSSOVER ADJUSTMENTS
For the amplifier to perform best with your speakers, the electronic crossover controls must
be set and adjusted accordingly
SELECTING THE OPERATION MODE
You must select and set the appropriate operation mode before you can proceed to
adjust crossover frequency points. This operation mode depends on the speaker system
connected to the respective amplifier channels.
→ Select H.P.F. if the speaker system is a component-, coaxial- or triaxial- type.
→ Select L.P.F in case of a kickbass or a subwoofer system.
→ Select Crossover "OFF" if your speaker system will handle a full range signal without
electrical or mechanical overload.
HIGH PASS CROSSOVER FREQUENCY ADJUSTMENT
For satellite speaker systems, select the “H.P.F.” mode, to cut off the bass content in the
music signal. Highpass filtering will take away unnecessary mechanical and electrical
‘strain’ from the connected speaker systems. Depending on cone surface, voice-coil
diameter and the power handling of the speakers, the following recommendations can be
issued:
FRONT DOOR SATELLITE SPEAKER SYSTEM („H.P.F.” MODE)
CROSSOVER FREQUENCY
13 cm 2-way Component System
80 - 110Hz
16 cm 2- or 3-way Component System
50 - 80Hz
REAR SATELLITE SPEAKER SYSTEM („H.P.F.” MODE)
HP CROSSOVER FREQUENCY
13 cm 2-way Coaxial or Component System
100 - 120Hz*
16 cm 2-way Coaxial or Component System
100 - 120Hz*
6x9” or 7x10” Triaxial Speaker System
100 - 120Hz*
* When a subwoofer is part of the audio system install.
LOW PASS CROSSOVER FREQUENCY ADJUSTMENT
Select “L.P.F.”, to activate the lowpass filter of the integrated electronic crossover. The
lowpass cut-off frequency setting depends on the woofer system and each vehicle is
different! As a rule of thumb, settings in between 60 to 90 Hz will usually give solid results.
The woofer lowpass frequency point is mostly a matter of taste, and must therefore be
‘played by ear’.
INPUT GAIN ADJUSTMENT
To reach a maximum in dynamic response from each individual head-unit/amplifier/speaker
combination, it is important to set the respective input sensitivity controls („GAIN“) of all
channel pairs correctly.
Before you start, you MUST set all tone controls (Bass, Mid, Treble, Loudness etc.) and the
fader on the head unit to their neutral or center positions.
Now turn all input gain controls of the installed amplifiers anti-clockwise to their minimum
positions and start with the channel pair that drives the subwoofer system.
SUBWOOFER CHANNEL(S)
Set the volume control of your head-unit to approximately ¾ of full volume, while playing a
dynamic piece of music. Slowly increase the input gain control of the channel pair driving
the subwoofer(s), by turning the GAIN control clockwise. Increase clockwise until the bass
starts to distort. Reduce the main volume level of your head-unit to a medium listening level.
Proceed with further channels, if applicable.
SATELLITE CHANNELS
Slowly increase the input gain control of the channel pair driving the satellite system,
by turning the GAIN control clockwise. Increase clockwise until you reach a good tonal
balance with a slight emphasis of the bass range. Repeat for all further channels.
FINE TUNING OF ALL CROSSOVER FREQUNCY POINT SETTINGS
Finally you can attempt to fine-tune the H.P.F. and/or the L.P.F. crossover frequencies on
your amplifier setup, to reach the maximum tonal balance and channel integration of all
loudspeakers connected to your car audio system.
INPUT CHANNEL SUMMATION
If the car stereo provides only speaker specific signals on each output (i.e. high frequencies
only for tweeter and second output with only low frequencies for the midrange/woofer),
you can get both signals to one complete full range signal. The sum function combines the
CH1+3 and CH2+4 input channels and forward them as dual mono signal to the outputs
CH1/2 and CH3/4 respectively.
If the car stereo provides only speaker dedicated signals (i.e. high frequencies only for
tweeter and second output with only low frequencies for the midrange/woofer), this sum
function combines both signals to one complete full range signal.
With the “Balance” potentiometer you can adjust the volume relation between CH1 and
CH3 and between CH2 and CH4. Clockwise turning means decreasing signal volume of
CH1 and CH3. Counterclockwise turning decreases the signal volume of CH2 and CH4.
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