Grounding - ALLEN & HEATH XONE V6 User Manual

The connection to ground (earth) in an audio system is important for two reasons:
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ground so that exposed metal parts are prevented from carrying high voltage which can
injure or even kill the operator. It is recommended that the system engineer check the
continuity of the safety ground from all points in the system including microphone
bodies, turntable chassis, equipment cases, and so on.
The same ground 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 ground. A 'ground loop'
results, causing current to flow between the different ground paths. This condition is usually
detected as a mains frequency audible hum or buzz.
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SAFETY - To protect the operator from high voltage electric shock, and
AUDIO PERFORMANCE - To minimise the effect of ground loops which result in
audible hum and buzz, and to shield the audio signals from interference pickup.
For safety it is important that all equipment grounds are connected to mains

Grounding

XONE:V6 User Guide