Allenheath XONE 62 User Manual download pdf (Page 16)

16 XONE:62 User Guide

Connecting Mains Power

Read the SAFETY INSTRUCTIONS printed at the

front of this User Guide and on the rear panel. Check

that the correct mains lead with moulded plug has

been supplied with your console. The power supply

accepts mains voltages within the range 100-240V

without changing any fuses or settings.

It is standard practice to turn connected power

amplifiers down or off before switching the console on

or off. This prevents any audible switch-on thumps.

Ensure that the IEC mains plug is pressed fully into the

rear panel socket before switching on.

Earthing

The connection to earth (ground) in an audio system is important for two reasons:

1. SAFETY - To protect the operator from high voltage electric shock, and

2. 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

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 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 earthing is solid to

start with you are less likely to experience problems.

• Do not remove the earth connection from the console mains plug. The console chassis is

connected to mains earth through the power cable to ensure your safety. Audio 0V is

connected to the console chassis internally. If problems are encountered with earth loops

operate the audio ‘ground lift’ switches on connected equipment accordingly, or disconnect the

cable screens at one end, usually at the destination.

• Make sure that turntables are correctly earthed. A chassis earth terminal is provided on the

console rear panel to connect to turntable earth straps.

• 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. To connect

an unbalanced source to a balanced console input, link the cold input (XLR pin 3 or jack ring) to

0V earth (XLR pin 1 or jack sleeve) at the console. To connect a balanced XLR output to

unbalanced equipment, link the cold output to 0V earth at the console.

• 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 ... Contact your service agent or local Allen & Heath dealer for advice.

FUSE

AC MAINS IN ~

BOOTH AUX OUT

USER

SERIAL No:

MONO OUT

CLEAN FEED

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 31 32

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Allenheath XONE 62 User Manual Page 16

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