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INTRODUCTION
The GL4000 continues ALLEN & HEATH’s commitment to provide high quality audio mixing
consoles engineered to meet the exacting requirements of today’s audio business. It brings you the
latest in high performance technology and offers the reassurance of over two decades of console
manufacture and customer support.
This user guide presents a quick reference to the function and application of the GL4000. For further
information on the basic principles of audio system engineering please refer to one of the specialist
publications available from bookshops and audio equipment dealers.
Whilst we believe the information in this guide to be reliable we do not assume responsibility for
inaccuracies. We also reserve the right to make changes in the interest of further product
development.
SERVICE AND TECHNICAL SUPPORT
Under normal conditions the GL4000 does not require user maintenance or internal calibration. In
certain cases it may be necessary to reconfigure internal option links. This and any service work
required should be carried out by qualified service or engineering personnel only.
We are able to offer further product support through our worldwide network of approved dealers and
service agents. To help us provide the most efficient service please keep a record of the console
serial number, and date and place of purchase to be quoted in any communication regarding this
product.
GENERAL PRECAUTIONS
POWER SUPPLY Use only the power unit specified for the console. Check the unit for
correct AC mains voltage setting before switching on. Allow adequate space around the unit for
ventilation.
CONNECTIONS Use audio connectors and cables only for their intended purpose. Do not
connect any source of AC or DC power to the console audio connectors. Do not connect the output
of power amplifiers directly to the console.
CLEANING Avoid the use of chemicals, abrasives and solvents. The control panel is best
cleaned with a soft brush and dry lint-free cloth. To remove stubborn marks (such as chinagraph
pencil) isopropyl alcohol may be used.
LUBRICATION The faders, switches and potentiometers are lubricated for life. The use of
electrical lubricants on these parts is not recommended.
DIRT, DUST, SMOKE and MOISTURE Prevent damage to the moving parts, such as faders
and potentiometers, and cosmetics by avoiding drinks spillage, tobacco ash, smoke, and exposure
to rain and condensation. Protect from excessive dirt, dust, heat and vibration.
Mains electricity is dangerous and can kill. Mains voltage is present within the power
supply unit provided with the console. Do not remove the power unit cover with mains
connected. The correct mains voltage setting is indicated on the rear of the power unit. Check
your mains wiring and earthing before switching on.
DO NOT REMOVE THE MAINS EARTH CONNECTION!
The console chassis is connected to mains earth to ensure your safety. Audio 0V
connects to the console chassis internally. Should problems be encountered with ground
loops operate the audio ground lift switches on connected equipment accordingly or
disconnect the cable screens at one end. Refer to the section on 'EARTHING' later in this User
Guide.
SAFETY WARNING
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