INTERFERENCE
All cables can create interference. The power cable and cinch / RCA audio cables are
very prone to interference from other sources, while remote cables are less prone.
Interference is often caused by the generator, ignition, or any other electronic parts or
systems. Most of these problems can be eliminated by correct and careful wiring
during setup. Here are some guidelines to follow.
• Use only a shielded audio cable for the wiring between the low level input of the
amplifier and the 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. Ir 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 towards a central
point in a star layout. You can locate fne best point by measuring the voltage directly
at the battery, and comparing the voltage value with the chosen ground point and
the positive terminal of the amplifier. If the measured voltage is only slightly different,
you've found the correct central location. Other wise please look for another point.
You should measure with the ignition point
for earth switched on.
• 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 measures not bring about any success, the use of a ground loop
isolator may solve the problem.
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