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14 XONE:92 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.
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR.
WARNING: THIS APPARATUS MUST BE EARTHED.
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE APPARATUS TO RAIN OR MOISTURE.
WARNING: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE FUSE WITH SAME TYPE AND RATING.
100 - 240V~ T500mAL 250V 20mm
OFF
SERIAL No:
0
I
ON
CAUTION
ATTENTION: REMPLACER LE FUSIBLE AVEC UN DES MEMES CARACTERISTIQUES.
FUSE
MIX 1
LEFT RIGHT
PHONO
LINE
INPUT
100 - 240V~
AC MAINS IN ~
47-63Hz ~ 30W MAX
L
L BOOTH
4
MIDI OUT
L
INPUT INPUT
LINELR
R L
3
LR
MIX2 R
2
PHONORL RL
14


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