INTERFERENCE
All cables can source and create interference. The power cable and Cinch/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 vehicle/or boat electronic parts. Most of these problems can be eliminated
by correct and careful cabling. In doing so, here are the following guidelines:
• 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. If 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. If measured voltage is only
slightly different, you’ve found the correct central. Otherwise you have to look for
another point. You should measure with the ignition point for earth being switched
on and additionally switched on consumers (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 electrics, add an interference suppression choke
into the power wiring.
• If there are humming noises, use thicker ground cables or add further ground
cables to the chassis.
• To reduce contact resistance and bad and loose contacts, please solder 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 meaures be without any success, the use of a ground loop isolator
may solve the problem.
PROTECTION CIRCUIT
This amplifier is provided with a protection circuit which operates in the follow-
ing cases when:
• the unit is overheated.
• the speaker terminals are short circuited.
HOW TO PROCEED IN CASE OF FAULTS
No Function:
• The connection cable is not connected correctly (=te12V/GND/REM).
Ensure that all connections and mechanic contact and that the jacket has been
removed. The fuse is defective-pay attention to the correct value of a new fuse!
No Sound:
• Speaker cable or speaker plug are not connected correctly.
• The plus and minus wires of the speaker cable have contact, thus eliminate the short
circuit. If you use Pay attention only 4 ohm load speaker is allowed. No 2 ohm or less
impedance speaker connection is allowed.
Poor Sound Quality (Distortions):
The speakers are overloaded, therefore turn down the volume level and check the
volume control positions.
No Stereo Sound And A Weak Bass:
Speaker cables (+) and (-) are mixed up, unit wired out of phase.
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