Allen&Heath Xone 23C - Manual (Page 17)

17
The connection to earth (ground) in an audio system is important for
two reasons:
SAFETY - To protect the operator from high voltage electric shock,
and
AUDIO PERFORMANCE - To minimise the effect of earth (ground)
loops which result in audible hum and buzz, and to shield the audio
signals from interference.
For safety it is important that all equipment earths are connected to
mains earth so that exposed parts are prevented from carrying high
voltage which can injure or even kill the operator. It is recommended
that a qualified system engineer check the continuity of the safety earth
from all points in the system including microphone bodies, turntable
chassis, equipment cases, and so on.
The same earth is also used to shield audio cables from external
interference such as the hum fields associated with power transformers,
lighting dimmer buzz, and computer radiation. Problems arise when the
signal sees more than one path to mains earth. An ‘earth loop’ (ground
loop) results causing current to flow between the different earth paths.
This condition is usually detected as a mains frequency audible hum or
buzz.
To ensure safe and trouble-free operation we recommend the following:
Have your mains system checked by a qualified electrician. If
the supply earthling is solid to start with you are less likely to experience
problems.
Make sure that turntables are correctly earthed. A chassis earth
terminal is provided on the console rear panel to connect to turntable
earth strips.
Use low impedance sources such as microphones and line level
equipment rated at 200 ohms or less to reduce susceptibility to
interference. The console outputs are designed to operate at very low
impedance to minimise interference problems.
Use balanced connections for microphones and mix output as
these provide further immunity by cancelling out interference that may
be picked up on long cable runs.
Do not unbalance the Xone:23C XLR outputs by shorting pin 3 to
ground as this may damage the circuitry; for unbalanced operation
connect the hot signal to pin 2 and the ground to pin 1. Leave pin 3
floating.
Use good quality cables and connectors and check for correct
wiring and reliable solder joints. Allow sufficient cable loop to prevent
damage through stretching.
If you are not sure ... Contract your service agent or local dealer for
advice.
EARTHING