Allen & Heath GR4 Datasheet
ZONE MIXER
TECHNICAL DATA SHEET
ALLEN&HEATH
• 8in/4out Mic/Line Mixer.
• Alarm & Paging Inputs.
• PL remote compatibility with additional analogue
remote inputs.
• Primary and Secondary Mic Modes: Perfect for controlling
hierarchal microphone feeds such as simple paging
announcements.
• Emergency Mic Mode: For use with 3rd party systems in
emergency situations. Mutes all inputs except MIC 1 on
alarm contact closure.
• Juke Box Mode: Provides a priority line input to the system
for pre-recorded announcements or programme material
such as Sports channels.
GR4 Technical Datasheet Allen & Heath Ltd
ZONE MIXER
GR4
ALLEN&HEATH
The mixer shall be a 1U rack-mountable analogue mixer with 8 inputs
and 4 Zone outputs.
Physical
The unit shall have four balanced microphone inputs on pluggable
terminal blocks. Each mic input shall have independent gain control
on rear mounted pots and have a +50dB gain and global Hi-Level
LED indication if any pre level signal is greater than 14dBu. In addition microphone “1” shall be made switchable to a front mounted XLR
connector via a front mounted selection switch.
There shall be independent control of High and Low frequency band
EQ via pots mounted on the rear of the chassis and a 200Hz HP filter
shall be employed via rear mount dip-switches.
There shall be four stereo unbalanced line level inputs on RCA connectors. Each stereo input shall have an independent level pot with
+5dB trim and global Hi-Level LED indication if any pre level signal
is greater than 14dBu. An additional 10dB shall be available for low
level sources via a PCB jumper. There shall be a priority line level
input which will override all other line level sources, however, there
shall be the ability to disable this function via a dip-switch. There shall
be a front mounted 3.5mm AUX socket that will have priority over any
source wired to stereo input 4.
The unit shall have two impedance balanced stereo zone outputs on
pluggable terminal blocks. Each zone shall have input source selection and variable mic and music level pots. There shall be independent control of High and Low frequency band EQ via front mounted
pots and a 3 LED stereo level meter. There shall be internal jumpers
to mono zones 1 & 2.
There shall be a further two zones which are impedance balanced
mono outputs on pluggable terminal blocks. The 2mix2 to these
outputs shall be pre-defined and have no less than six optional mixes
selectable via PCB jumpers.
The unit shall accept remote control inputs via two rear mounted
4-wire pluggable terminal blocks. Each connector will allow analogue
control of music source and level via a 0 – 10v control signal. An
additional RJ45 connector shall be present to accept off the shelf wall
mounted controllers with a maximum of two controllers connected
in daisy chain configuration. Remote control shall be enabled via dip
switch.
Features
The unit shall have the following features;
Primary mic mode: When audio sensed on MIC1 channel and/or
PAGE contact closure is sensed then music is faded to pre-set level
and MICS2-4 muted for the duration of the announcement. MIC1 zone
select LEDs flash slowly when in priority mic mode.
Secondary mic mode: When audio is sensed on MIC2, 3 or 4 then
music is faded to pre-set level for the duration of the announcement.
MICS 2-4 zone select LEDs flash slowly when in secondary mic
mode.
Emergency mic mode: When alarm contact is activated all zone
feeds are muted and Mic1 is fed direct to all zones. All select LEDs
except mic1 LED are switched off for the duration. Mic1 LED will flash
quickly.
Juke box mode: When music sensed on ST3, fade down current
music feed and fade up ST3. When ST3 silent for pre-set period, fade
down ST3 and resume previous music feed. Mic volume not affected.
Music fade: Option to select next music feed and then unit will fade
between sources after short delay.
Zone lock: Allows select buttons to be disabled for a particular zone.
LED corresponding to the button locked will be turned off.
General
It shall have a built in power supply accepting AC mains voltages
of 100~240V, 50/60 Hz, 12W max via an earthed 3-pin IEC C6 male
connector mounted on the rear chassis.
A switch shall be provided on the front chassis to isolate the mixer
from the incoming mains supply.
Recommended operating temperature for the mixer shall be 5 to 35
degrees Celsius.
The unit shall be the Allen & Heath GR4.
There shall be an alarm contact closure input on a pluggable screw
terminal connector. The input shall be Normally Open (NO) and
reversed to Normally Closed (NC) via DIP switch.
GR4 Technical Datasheet Allen & Heath Ltd
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