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After the amplifier has been installed and all connections have been made careful
-lyand securely, turn the radio on so that the amplifier is switched on automatically.
After a short power-on period, the amplifier reaches its full performance.
Now turn up the volume slowly using the volume control of the radio. If there is no
sound or only a distorted replay, switch off the radio immediately, the amplifier will
also switch off automatically, and check if all connections have been made correctly.
POWER=LED POWER INDICATOR
After the orderly connection of the three power terminals, the LED indicator shines
green and goes out with off.
PROTECT =LED PROTECTION INDICATOR
This set is equipped with an overload protection, immediately upon overloading
due to short circuit or much increased temperature the overload protection is
activated and the red LED indicator is shining. Through this the amplifier is
protected against damage. In case of the thermal protection a certain short cooling
time must be allowed after which the amplifier automatically resumes operation.
LEVEL CONTROL
The input level control allows the system to work well within a wide range of output
level. Choose the adjustment in the way that you achieve a sound most possibly
without any distortion. as a guideline the following procedure is recommended:
If you use several amplifier, the adjustment has to be made for each set separately,
tune up the volume of your car radio to 2/3 of the maximum volume.
Now turn the gain control of the amplifier from " Min " to " Max " direction until you
can hear distortions. Then turn the level control a little back to " Min ". The gain
control adjustment is finished now.
Attention!
If you use 2 Ohm speakers in stereo mode. Tri-mode or 4 Ohm speakers
in bridge mode and the overload protection is triggered, turn the gain control to
" Min " direction, until the operation is free of trouble.
SUBWOOFER FREQUENCY
In case subwoofer has been connected to the amplifier, this loudspeaker can be
run through a low pass filter in an optimum frequency range. For this purpose
has be turned to 50Hz or 250Hz. In "off " position the low pass filter
is not activated. The crossover frequency to be chosen in each case mainly
depends on the cone size of the subwoofer. If this is 8"
10", then use 300Hz.
When the speaker have a size of 12" or 15", 50Hz is the better choice.
HIGH PASS AND LOW PASS CONTROLS
This amplifier has
controls for making good sound
combination.
low pass filter
or
high pass and low pass
OPERATION
INTERFERENCE
Use only a screened audio cable for the wiring between " low level in " of the
amplifier and RCA or DIN output of the radio .
Lay the signal, speaker and power cables separately with enough distance
from one another and also from each other car cable. lf not possible, you can
lay the circuit and ground cable together with the serial cables. Audio and
speaker cable should be as far away from these as possible. The REM cable to
the automatic antenna output of the radio can be laid together with the signal
cables.
Avoid ground loops by laying the ground wiring of all components to a center
point in a star-like way. You can find the best central point in measuring the
voltage directly at the battery. Now compare this voltage value with the chosen
ground point and the (+) terminal of the amplifier. lf the measured voltage in
only less different
you've found the correct central.Otherwise you have to look
for another point. You should measure with the ignition being switched on and
additionally switched on other electronics ( rear window heating and light ).
If there are pickups from external electrical sources into the speaker cables,
divide the core leads and twist them together.
If there are noises from the car electronics. Add an interference suppression
choke to the power wiring .
If there are huming noises, use thicker ground cables or add further ground
cables to the chassis.
To reduce contact resistance and bad and loose contacts, please tin the cable
ends or use multi core cable ends, spade terminals or others. Gold Plated
spade terminal are free of corrosion and have the lowest contact resistance.
Should all these measures to without any success. the use of a ground loop
isolator may solve the problem.
All cables are sources of interference. The power cable and RCA audio cable
are very prone to interference; the remote cables are less prone . There is often
interference caused by the generator (piping), ignition ( cracking ) or other car
electronic parts. Most of these problems can be eliminated by correct and careful
cabling. In doing so, these are the following guidelines :
