Allen&Heath GR05 - Manual (Page 7)

GR05 User Guide 7
Rack or Desk Mount
8
The GR05 is shipped with the two rack ears and its
plastic feet fitted. The unit will fit into a 1U space in a
standard 19” industrial rack case. Use the bolts
provided by the rack supplier to mount the unit in the
rack. Remove the feet if required. You can also use the
rack ears to mount the unit into a plinth.
For desktop or shelf operation the rack ears can be
removed. The plastic feet prevent the unit scratching the
mounting surface or slipping.
Plug up the Connectors
9,12-20
The wiring harnesses can be prewired and installed
before the unit is put in place. All connections are
pluggable. Connector types are 3-pin XLR for the
microphone inputs and zone outputs, RCA phono for the
stereo line inputs, and 25-pin D-type for the
expander/remote and battery interface. The mains input
is on standard 3-pin IEC connector.
Make sure that you allow enough length in the cables for
the unit to be removed for configuration.
Assign the Controls
10,11
The GR05 front panel level controls and rear panel gain
trimmers may be set in 3 ways: The knob is fitted for
user control, the knob may be removed so that it
becomes a preset trimmer adjustable using a slotted
screwdriver, or a plug may be fitted locking the control
so that it cannot be adjusted by the operator. It is
important to assign these so that the operator has
access only to those controls which need adjusting
during normal daily operation.
Front panel ident blocks are provided so that the
controls can be identified according to the application.
These can be marked using permanent pen, or adhesive
labels.
Remove the Cover
Switch off mains power before removing the cover.
To gain access to the configuration links and trimmers
remove the 8x M3 T10 Torx head screws and lift the top
cover away from the unit. Power may be re-applied while
adjusting the internal trimmers. Avoid the internal
power supply components. There are no adjustable
parts in the power supply.
Microphone Inputs 1,2
12
A balanced XLR input for each accepts a microphone or
mono line level signal. Adjust the sensitivity using the
rear panel gain trimmer. Use the meter LED to check for
correct signal level. Internal links provide options for an
attenuator pad, phantom power and lo-cut filter. Internal
trimmers adjust the EQ providing control of the low
frequency and mid/high frequencies, ideal for optimising
the tonal response of speech microphones.
Line Inputs 3,4,5
14
Each has a pair of RCA phono sockets for Left and Right
inputs. For mono sources only one need be used. To
mono a stereo source use the routing options as
described below. Use the internal jumper links to set the
sensitivity for high level +4dBu or low level –10dBV
equipment. Check for correct signal level using the
meter LEDs.
Routing Matrix
12,14
Internal link options let you route any input to any
combination of outputs. For example a stereo line input
could be routed to outputs 1 and 2 in mono and to
outputs 3 and 4 in stereo, or a microphone could be
routed to just one zone only. For each input to each
output set the link to ‘OFF’ for no routing, ‘VCA’ for
routing with level control and ducking, or ‘DIRECT’ for
routing without level control or ducking.
Outputs
15
The 4 outputs are line level on 3-pin XLR impedance
balanced connectors for interference rejection on long
cable runs. These have internal trimmers that adjust
between –10dBV low level and +4dBu high level for
signal matching and balance control. A 2band EQ with
internal trimmers lets you adjust the low and high
frequency response to match the speakers or room
acoustics. This can also be used to compensate for the
loudness effect when playing background music at low
volume.
Level and Ducking
16-19
Signals routed direct to the outputs are not affected by
level control or ducking. These would include paging
microphones, jukebox playback and alarm messages.
Signals routed through the VCAs to the outputs are
affected by level control and ducking.
Internal link options for each output determine whether
the level is controlled from the front panel or by +10V
remote. Front panel controls can be grouped for single
control of several outputs, for example a stereo zone.
The front panel mute switch can be set to control any
combination of outputs.
Internal and external ducking can be separately
configured to affect any combination of outputs. Internal
ducking is triggered by setting links for Mic1 or Mic2 or
both. Option links separately set internal and external
ducking depth and release time. Ducking can be set to
mute rather than reduce the signal, for example with
jukebox override.
Completion
After configuring the unit check the system for correct
operation. Refit the cover. Log the details on the
Configuration Sheet provided at the rear of this Guide.