Allen&Heath GR2 PL-12 USER GUIDE 1 - Manual (Page 8)

8 GR2 User Guide
Audio Signal Paths
Simplified block diagram
Page mix - Overrides the music/mic selection. The input is from the external
page input and/or from mic 1 if it is configured as a paging mic. The page mix
EQ provides high pass and low pass filters tuned for paging speech. The mix
routes directly to the zone outputs and is not affected by the output level front
panel or remote controls. Signal detected on the page mix causes ducking of
any page enabled zone.
Mic mix - The performance or conference mic mix. Depending on the
configuration, the mic mix may comprise 3, 4, 5 or 6 mic inputs being sourced
from mics 1-6, 2-6, 1-4 or 2-4. The mix of mic inputs can be routed to the zones
via the VCAs, or direct to the aux output. A dedicated mic EQ provides a swept
frequency high pass filter, swept frequency peak/dip mid, and shelving high
frequency cut/boost tuned to deal with typical live performance or conference
microphone mixing.
Music mix - An independent mix of the music sources for each zone. Each
has operator controllable music source selection. The number of sources that
can be selected by the operator depends on the configuration, either 2, 3 or 4.
Alternatively, all sources can be permanently mixed together. Music 1 input can
have priority over the other sources for applications such as jukebox or live /
pre-recorded retail announcements. Mics 5/6 can be configured as an
additional ‘music 4’ balanced stereo source. This allows either 6 mic / 3 stereo
music or 4 mic / 4 stereo music capability.
Zone 1 and 2 VCA mixes - The music plus mic mix for each zone. Zone 1
is stereo, zone 2 is mono. Routed through a VCA, the mix is overridden during
paging or when the alarm input is triggered. The mic mix can be added to the
pre-VCA music mix. Zone 1 has a 2-band EQ and mono switching.
Aux mix - An independent mono output which can be sourced from any
combination of the page mix, mic mix, post-level zone 1 or zone 2 mix.
Applications include routing the page mix only to create a single paging source
to daisy chain through other GR2 units, routing mic mix only to expand the
number of mics to a second GR2, feeding a conference recorder, or creating a
mono sum and filtered sub bass mix to compliment the zone 1 stereo output.
MIC1
EXPAND
PAGE EQ
PAGE MIX
EXT PAGE IN
MIC MIX
MIC EQ
MUSIC1
MUSIC2
MUSIC3
< SELECT >
1
2
3
4
1
2
3
4
LEVEL
MICS
MICS
ZONE1 EQ
SOURCE
PAGE MIX
MIC MIX
ZONE1
ZONE2
LEVEL
PAGE
PAGE
SUB EQ
AUX
ZONE2
AUX
MIC2
MIC3 MIC4
MIC5 MIC6
MIC MIX
ZONE1 MIX
ZONE2 MIX
SOURCE
ZONE2 AUX
ZONE1
ZONE1
STEREO
MONO
MIC5/6, MUSIC4
PAGE MIC
MUSIC PRIORITY
MIC PRIORITY
DUCKING
UTILITY REMOTE
Z1 PAGE ENABLE
ZONE REMOTE
MIC MUTE
MIC PRIORITY
ALARM OVERRIDE
Z1 SOURCE SELECT
Z1 LEVEL
Z2 SOURCE SELECT
Z2 LEVEL
Z2 PAGE ENABLE
PHANTOM POWER
MUSIC MUTE
MIC MUTE
MONO / STEREO
GR2 AUDIO ZONE MIXER
MUSIC
10V LOGIC
< SELECT >
GAIN / PAD
LINE +4/-10
L
R
L
R
L
R
L
R
PL-12 WALL PLATE
5
4
3
2
1
PL-5
5
4
3
2
1
6 7 8 9
12 13
10 11
14
PL-5 IR CONTROLLER
REMOTE CONTROL