GR1 BROCHURE
GR
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Zone Mixer
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6 channels configurable from 24 inputs.
3 zone outputs. Expandable via Sys-LinkTM
Built-in comp/limiter, ducking and alarm functions
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AUDIO SIGNALS TO ITS 6 INPUT CHANNELS CAN BE SELECTED FROM UP TO 24 SEPARATE
SOURCES. GR1 ALSO ACCEPTS ALARM AND EMERGENCY INPUT SIGNALS; CAN RESPOND TO
REMOTE VOLUME CONTROL ON EACH OF ITS 6 INPUT CHANNELS AND THREE OUTPUT BUSSES;
INCLUDES PRIORITY DUCKING CIRCUITS, BUILT-IN COMPRESSOR/LIMITERS AND
PHANTOM POWER FOR MICS.
THREE CHANNELS HANDLE STEREO LINE SIGNALS.
OTHER FACILITIES INCLUDE CHANNEL INPUT TRIMMERS,
LO-CUT FILTERS, DIRECT OUTS AND PEAK LEDS; 3 OUTPUT LEVEL METERS AND
STEREO/MONO MONITORING. IT ACCEPTS EXTERNAL EMERGENCY POWER BACKUP AND
REMOTE LEVEL CONTROL, AND CAN BE EXTENDED THROUGH SYS-LINK TO IDENTICAL UNITS TO
HANDLE MORE CHANNEL INPUTS OR ZONE OUTPUTS.
Zone Mixer
THOUGHTFULLY DESIGNED FOR SOUND DISTRIBUTION IN CLUBS AND PUBS, HOTELS AND
CONFERENCE CENTRES, CIVIC BUILDINGS AND LEISURE COMPLEXES, GR1 HAS THE
FLEXIBILITY AND POWER TO BE TAILORED NEATLY TO SUIT ITS LOCATION.
GR
GR1 IS THE CONTRACTING ENGINEER'S DREAM OF A ZONE MIXER. BUILT TO THE
EXACTING STANDARDS OF ALLEN AND HEATH, PACKED WITH CONFIGURABLE FACILITIES,
YET SIMPLE FOR THE OPERATOR TO USE.
1
INTRODUCTION
INTERNAL CONFIGURATION
The GR1's configuration is done internally. The only external
controls are those needed for day-to-day operation, so the
configuration cannot be changed by operators' errors or
experiments.
Routings, ducking, limiter and compressor characteristics,
phantom power, alarm source, remote control and other
functions are set by jumpers and trimmers accessible clearly
and easily beneath the top cover.
Removal of the cover, which is printed with a big
schematic diagram to guide configuration, reveals the
orderly layout and high-quality construction of this British
built mixer.
GR1 is designed to BS5839 installation standards and meets
Health and Safety requirements for emergency equipment.
The all-metal 1U high rack mount chassis has a steel front
panel and top cover. Internal links permit grounding
configuration changes to avoid loops in specific installations.
When the Channel 1 source switch is in its mute position,
internal connection is made to the alarm input for diagnostic
and installation setup.
GR1 channel functionality
The operator's front panel is clean and
simple: 6 channels, each with a source
selector switch, concentric pan and level
controls and a peak indicator; an output
section with 3 level controls and meters;
and monitor output. Power supply and
alarm active leds indicate status, and pushbutton switches control ducking and
stereo functions.
Its simplicity belies the true sophistication
and flexibility of this professional mixer.
Zones
Balanced outputs are provided on three
XLR connectors, configured as one split
stereo buss and one independent mono
buss. GR1 can therefore feed mono to
three independent zones, or stereo to one
zone and mono to a second.
Internal routing of each input channel
may be set to one or any combination of
the mono, L and R busses
Channel direct outs on the Sys-Link-out
D-connector may be used (pre or post
level) to feed further zones, recorders or
other devices, or to extend zone capacity
through linked GR1s.
Mic inputs
All six channels have XLR balanced mic
inputs which can be selected from the
front panel source switch. Phantom
power may be configured globally or
individually and gain trimmers match mics
to the input preamps. Level setting is
aided by channel peak leds and 70Hz
lo-cut filters on each channel can be
selected internally to reduce mic thumps
and rumble.
The mic inputs may be used for line
sources if the XLR connector is preferred
to the line jacks: internally selected 20dB
pads enable level matching.
Line inputs
Mono line inputs are provided for
channels 2 and 3, and stereo for channels
4-6, each from one of two sources: rear
panel TRS balanced line jacks; or aux
(unbalanced) pins on the Sys-Link-in
connector.
Channel 1 has an aux line input but no
jack connection because its front panel
source switch is given a mute position
instead of line (used also for setup and
testing).
Unbalanced inputs are acceptable on all
lines, and internal settings allow individual
input levels at +4dBu, 0dBu or -10dBV.
Stereo sources can be mono summed
using the front panel buttons, enabling
L+R signals to be sent to both L and R
busses as well as the mono buss.
Left and right stereo inputs may be fed
from separate mono sources, increasing
the active mix to 9 inputs.
Masters and monitors
The three output levels are set by
concentric controls for the L and R busses
and a separate control for the Mono buss.
Output level for each buss is shown on
the peak signal led meters and three red
leds show when the limiter is active on an
output.
Each XLR output is balanced to enable
long feeds to several amps without loss,
and can be internally set to +4dBu, 0dBu
or -10dBV operating levels.
Monitor level to the headphone output
jack is adjustable, and a pushbutton selects
either mono or L and R busses. This
output can also be used for remote
monitor or recording feed, for example in
conference remote controlled
installations.
GR1 built-in extras
Remote control
The gains of all of the high-performance
channel and output amplifiers are voltage
controlled by 0 to +10V d.c. signals;
internal links enable each signal to be
supplied either from its front panel level
control, or from a remote source via the
remote dc D-connector. Signals can be
supplied from a computer system, for
example in conference installations, or
from conveniently mounted wall
potentiometers in hotel and club venues
(a reference +10V is available in the Dconnector).
Alarm and emergency functions
Alarm override and automatic power
backup combine to provide a complete
and foolproof emergency system.
GR1's alarm override allows automatic
control of the system by an alarm
recording or live announcement. The
override is activated when the alarm dc
pin in the Sys-Link-in connector is linked
to 0V - either by a switch or an external
logic system such as the venue's fire
control unit.
On activation, the alarm active panel led
lights and all outputs switch to the alarm
source. Internal links select the alarm
source as either Channel 6 Mic
(remember, this can have a line input
connected if required) or an external
alarm audio input.
Another internal link, in conjunction with
the Channel 1 mute switch, enables
diagnostic checking of the alarm audio
source.
Emergency +/-12Vd.c. power backup may
be supplied via the Sys-Link-in connector,
and GR1 will automatically switch to this
when the internal supply voltages fall
below the backup voltage. The front panel
on led shows whenever mains or backup
power is available.
Compressor/Limiters
A high-performance compressor/limiter is
available for each of the output busses to
safeguard external amps and speakers
from overload and to prevent wide-range
dynamics running into distortion. Internal
links define whether each
compressor/limiter is in circuit, which
outputs provide their control signals
(sidechain source) and what compression
ratios from 10:1 to 2:1 are to be used.
Threshold levels can be trimmed from 30dB to +15dB and L and R busses can be
linked for stereo compressor/limiter
operation.
Sys-Link expansion
GR1 zone mixers may be cascaded via
Allen & Heath's unique Sys-Link
interconnection, to extend either the
number of input channels or output
channels.
The single screened cable between the 15pin D-connectors on master and slave
units carries all audio signals and alarm
lines so one alarm source controls all units
simultaneously. Backup power, if
required, is fed to each mixer through its
remote d.c. connector.
Used in input-expansion mode, the master
GR1 has exclusive control of the threebuss output levels. Conversely, if coupled
for output-expansion to extend the
number of zone feeds, only the master
unit controls input levels.
No limits
Ducking and dipping
GR1's priority ducking system dips
background music or other programs for
announcements and voiceovers. When a
front panel priority button is pressed that
channel takes precedence over all others
(except one which also has its button
depressed) causing the signal from the
priority channel's microphone to dim all
else.
Channels 1 to 3 may be selected as
priority channels and channels 4 to 6 are
normally set to be ducked.
Internal links can be used to disable any
channel from ducking and further options
allow selection of ducking depth from 6dB to -18dB and return time from slow to
fast.
Unlimited slaves can be added.
GR1 may also be daisy-chained via the SysLink system to other mixers in the Allen &
Heath range; for example, a live desk or
DJ mixer. This versatile and convenient
method of interconnection can be made in
either direction, and leaves all outputs
from the slave mixer still available for
normal feeds.
Sys-Link cables may be up to 10 metres
long, and configured to include any or all
auxiliary busses, group busses, LR buss,
PFL, AFL and PFL/AFL logic as appropriate.
GR1 example applications
VENUE
PUB/INN
CONFERENCE
INPUT EXPANSION
More slaves can be added as required. Alarm source
controls all units simultaneously. Disable internal links
on source for output control on Master unit only.
OUTPUT EXPANSION
More slaves can be added as required. Alarm source
controls all units simultaneously. Switch inputs to Aux
on slaves. Set links to pre-fade on Direct Outs.
GR1 connections and circuits
Inputs
Mic, ch 1-6
Connector
x6
XLR
Mono Line In
x2
Stereo Line in
x3
Aux in (Sys-Link)
6 pins
L,R,M in (Sys-Link)
3 pins
Alarm & d.c In (Sys-Link) 3 pins
Remote VCA d.c. In
9 pins
Backup d.c.in
4 pins
Outputs
L,R,M Out
x3
L,R,M Out (Sys-Link)
3 pins
Direct Out (Sys-Link)
6 pins
Phones Out
x1
Remote VCA d.c.ref
2 pins
Alarm & d.c.Out (Sys-Link)
ohm
-2dBu
Mains power inlet
x1
pin2+, 3-
TRS jack
TRS jack
15way D female
15way D female
15way D female
15way D female
15way D female
tip+, ringtip+, ring-
XLR
15way D female
15way D female
TRS Jack
15way D female
3 pins
pin2+, 3-
Impedance
Level
balanced
2k ohm
-55 to +12 dBu
pad selected
10k ohm
-35 to +8 dBu
balanced
10k ohms
-10dBV, 0dBu, +4dBu
balanced
10k ohms
-10dBV, 0dBu, +4dBu
unbalanced
10k ohm
-2dBu
unbalanced
10k ohm
-2dBu
unbalanced
10k ohm
-2dBu
0V=off, 10V d.c.= max
max +16V, -16V, +48V d.c.; min +12V, -12V, +12V d.c.
balanced
50 ohm
-10dBV, 0dBu, +4dBu
unbalanced
50 ohm
-2dBu
unbalanced
50 ohm
-2dBu
tip L, ring R 8 to 400 ohm stereo headphones recommended
10V, 0V d.c. reference voltage for remote VCA control
15way D female
unbalanced
50
Standard IEC 3 pin L,N,E. IEC to moulded plug supplied (country-dependent),
internally wired for required worldwide voltage
POWER SUPPLY
Internally regulated +/- 16V
+48V d.c. phantom power
MAINS POWER
AC mains input
Internal unit
100 to 240V a.c. @ 50/60Hz
Internally wired to country voltage
Power consumption
25VA max
Mains fuse rating
100-120V a.c. use
T315mA 20mm
220-240V a.c. use
T630mA 20mm
DC POWER BACKUP
External d.c. power supply or batteries
+/-12V to 16V d.c. @ 300mA
+12V to +48V d.c. for phantom power
MECHANICAL SPECIFICATIONS
Width
Height
483(19")
44(1.75")1U
Unpacked
Weight
4.5kg
Depth
262(10.3")
Packed
5kg
GR1 BLOCK DIAGRAM
MAXIMUM OUTPUT LEVEL
Balanced
+28dBu into 600 ohm
Unbalanced
+21dBu into 2k ohm
INTERNAL HEADROOM +23dB
PEAK LED
Turns on 5dB before clipping
METERS
Individual bargraphs for L, R, M outputs:
Peak: on 5dB before clipping
0dB
Signal: dynamic indication from -20dB
FREQUENCY RESPONSE
20Hz to 30kHz: +/- 1dB
Depth -6, -12 or -18dB links
Release fast or slow links
Control from channel 1, 2 & 3 Priority switches
Individual channel ducking disable links
TOTAL HARMONIC DISTORTION < 0.04%
CROSSTALK measured at 1kHz
Channel shutoff < -90dB
Channel pan
< -75dB
Interchannel
< -80dB
NOISE measured r.m.s. 22Hz to 22kHz
Mic EIN referred to 150 ohm source -128dB
Line preamp at 0dB gain
-90dBu
Mix noise (all routed)
< -80dBu
ALLEN & HEATH
Kernick Industrial Estate, Penryn, Cornwall TR10 9LU.
Tel: (+44) 01326 372070 Fax: (+44) 01326 377097
http://www.allen-heath.com
AP2017
DUCKING
COMPRESSOR/LIMITERS
L, R, M, individually controlled
Ratio
2:1 soft compression link
4:1 hard compression link
0dBu = 0.775 Volts rms
0dBV = 1 Volt rms
The GR1 complies with the
European Directives for
Electromagnetic Compatibility
89/336/EEC & 92/31/EEC
1995
Allen & Heath reserve the right to improve or otherwise alter any information supplied in this document or any other documentation supplied hereafter
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