10 XONE:02 User Guide
100 - 240V~
47-63Hz ~ 30W MAX
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR.
Installation
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
50/60Hz AC 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.
• Deal with ground loops Should you experience hum or buzz caused by ground loops, check first
that each piece of equipment has its own separate path to ground. If so, operate ground lift
switches on connected equipment in accordance with the instruction manuals. Alternatively
disconnect the cable screen at the destination end only. This breaks the offending loop while still
maintaining the signal shielding down the length of the cable.
• 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 the microphone and main outputs as these provide further
immunity by cancelling out interference that may be picked up on long cable runs. Refer to the
cable drawing for information on how to connect balanced and unbalanced equipment.
• Route cables to avoid interference To avoid interference pickup keep audio cables away from
mains power units and cables, thyristor dimmer units or computer equipment. Where this cannot be
avoided, cross the cables at right angles to minimise interference.
• 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.
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