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If the use of unbalanced connections is unavoidable, you can
mimimise noise by following these wiring guidelines:
• On INPUTS, unbalance at the source and use a twin,
screened cable as though it were balanced. (see below)
• On OUTPUTS, connect the signal to the +ve output pin,
and the ground of the output device to -ve. If a twin
screened cable is used, connect the screen only at the mixer
end. (see below)
+
+
+
+
-
-
Mixer
Mixer
Source
Device
Output
Device
GND
GND
GND
INPUT
OUTPUT
+
+
+
+
-
-
-
-
Ground loop
through screen
and chassis
Mixer
Mixer
Source
Device
Source
Device
GND
UNBALANCED
BALANCED INPUT
✗
✓
Avoid running audio cables or placing audio equipment,
close to thyristor dimmer units or power cables.
Noise immunity is improved significantly by the use of low
impedance sources, such as good quality professional
microphones or the outputs from most modern audio
equipment. Avoid cheaper high impedance microphones,
which may suffer from interference over long cable runs, even
with well-made cables.
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