Operation Manual

Page 13

- Use only a shielded audio cables for the wiring between „low level in“ of

the ampliﬁer and RCA or DIN outputs of the radio.

- Lay the signal, speaker and power cables separately with enough

distance from another and also from any 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

centre 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 the measured voltage is only less different, you have 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

consumers (rear window heating, light etc).

- 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 tin the

cable ends or use multicore cable ends, spade terminals or others. Gold-

plated spade terminals are free of corrosion and have the lowest contact

resistance.

- Should all these measures be without any success, the use of a ground

loop isolator may solve the problem.