SoundCraft Spirit Live 4 - Manual (Page 10)

If the u se of u nbalanced connections is u navoid able, you can
m im im ise noise by follow ing these w iring gu id elines:
•
On IN PUTS, u nbalance at the sou rce and u se a tw in,
screened cable as thou gh it w ere balanced . (see below )
•
On OUTPUTS, connect the signal to the +ve ou tp u t p in,
and the grou nd of the ou tp u t d evice to -ve. If a tw in
screened cable is u sed , connect the screen only at the m ixer
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 ru nning au d io cables or p lacing au d io equ ip m ent,
close to thyristor d im m er u nits or p ow er cables.
N oise im m u nity is im p roved significantly by the u se of low
impedance sou rces, su ch as good qu ality p rofessional
m icrop hones or the ou tp u ts from m ost m od ern au d io
equ ip m ent. Avoid cheap er high im p ed ance m icrop hones,
w hich m ay su ffer from interference over long cable ru ns, even
w ith w ell-m ad e cables.
Pa g e 8