Allen&Heath GR8A - Manual (Page 9)

GR8A U SER G UIDE 9
INSTALLATION
The GR8A can be rack or desk top mounted. It is supplied with rack ears
and desk feet fitted. These may be removed according to the installation
required.
RACK MOUNT The GR8A fits into a 2U space in a standard 19” rack
system. The rack should allow a minimum side to side opening of 445mm
and a depth of at least 420mm to include the connector space required.
Secure the unit into the rack using two M6 bolts on each side. These are
usually provided by the rack supplier and are typically chrome or black
bolts that seat in black plastic cups to prevent scratching the equipment
panel. If space is tight beneath the unit you can remove the plastic feet by
prizing them off. It is advisable to mount the heavier units such as
amplifiers towards the bottom of the rack. This lowers the centre of gravity
for easier handling.
DESK OR SHELF MOUNT Remove the two rack ears. Use a crosspoint
screwdriver to remove the two M4 fixing screws on each side. Make sure
the plastic feet are fitted as these protect the mounting surface from
scratching and prevent the unit sliding.
CABLE ROUTING It is well known that the majority of hum, noise and
routing problems are caused by poor connections and cables. Use high
quality cable and connectors and check for reliable soldering and
assembly. Use balanced connections and screened cables for the inputs.
If you have problems with ground loops lift the screen connection at one
end of the input cables or operate the source equipment ground lift
switches. Use adequately rated speaker wire for the outputs. Input cables
may be run together but outputs should be separated to avoid interaction
between the amplifiers. Route all input and output cables away from
mains, computer and lighting cables.
IMPORTANT WARNINGS !
When positioning the GR8A ensure that the front air intake and the
exhaust vent on the left hand side of the unit are not obstructed or
blocked.
It is normal for the amplifier to run hot when it is working hard. It is
important that air flow around the unit is not restricted. If free air
flow is restricted then additional forced cooling should be provided.
The GR8A is a heavy item. Ensure it is securely fixed where it will
not fall or slip and cause damage or injury.
To avoid damage to the internal assemblies do not fit screws or drill
holes in the sides or underside of the unit. Secure to external
brackets or fittings through the front panel rack mounting holes.
Ensure that the mains voltage setting marked on the rear panel is the
same as your local mains supply.
Do not remove the top cover. There are no user serviceable parts
inside. Refer servicing to qualified service personnel.
To ensure your safety make sure that all the chassis and metalwork
in the rack system is connected to mains earth. Use a continuity
meter to check this. Do not remove any safety earths from
equipment.