GR2 User Guide 19
Application Example 2 - Conference
Here, stereo zone 1 provides audio for the presentation, typically from a PC
running a projector display, or from a VCR, DVD or CD. Mono zone 2 provides
speech reinforcement to the audience via overhead ceiling speakers. The aux
output sums the presentation and speech channels together to record the
proceedings. Typically up to 6 mics are required for chairman, speakers,
presenters and audience participation. GR2 units may be linked to provide
additional mics, for example 12 or 18. Mic 1 priority can be selected so that the
chairman has priority over the presenters, typically during the introduction or
summary. Often a technician controls the equipment from a booth or other mix
position. Alternatively, remote control may be used such as wired plates or third
party touch screens which integrate the multi-media systems.
The GR2 provides a good solution for this application as it includes many inputs
(6 mic and 3 stereo lines), independent mono and stereo zone and a utility aux
output in a compact, affordable unit. The mic EQ optimises the response for the
ceiling speakers, particularly to notch out a dominant feedback frequency,
compensate for speaker characteristics and to filter out low end pops and noise
from the microphones. The separate zone 1 EQ sweetens the presentation
audio to the main stereo speakers.
Phoenix screw terminal plug connectors used for the mic inputs and zone
outputs simplify the installation, particularly if it is to be pre-wired. The RCA
phono line inputs and aux output are convenient for direct connection to the
source equipment and recorder.
The configuration switch settings for this example are shown below. In this
case, the mic priority function is enabled, sources mixed together rather than
individually selected, mics only sent to zone 2, and the zone 1 and 2 sources
mixed for recording from the aux output.
AUDIO ZONE MIXER
GR2
ALLEN&HEATH
prioritymute
mic 3mic 2mic 1
mic 6mic 5mic 4 music 4mics zone 1 zone 2alarmmusic 3music 2music 1
mute >mono < source ><source
21
21
mic mic music
212121
AUX = RECORDING
CHAIRMAN PRES 1 PRES 2 PRES 3 PRES 4 PRES 5 PROJECTOR VIDEO CD PRESENTATION MICS
CHAIRMAN
QUESTIONS
PRESENTERS
SCREEN
SPEECH REINFORCEMENT
CEILING SPEAKERS
ZONE 2
PRESENTATION
STEREO PRESENTATION SOUND
ZONE 1
LR
PC
VCR
DVD
LECTURN MICS
TABLE MICS
RADIO MICS
3 STEREO IN
6 MIC IN
RECORD
page Z2
56342
Z1
mic1=page
1
mic priority
mic enable
phantom pwr
!
ABCD
long releasemic56=music4
Z1 enable
Z2 enable
Z1 source
Z2 level
Z2 source
Z1 level
music
follow Z1
follow Z2
mic mix
page mix
mics
sel
one
remote enable
zone source
music
select
EFGH
IJKL
music 1 priority
MNOP
QRST
on
mic
on
on on
mix
all
Z1=music+mics
Z2
on
on
UVWX
aux source
100Hz
aux output
sub filter
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