G
GG
GL
LL
L2
22
28
88
80
00
00
00
0M
MM
M
18
Allen & Heath
Polarity Refers to the positive (+) and negative (-) wires of a
loudspeaker or balanced audio connection. The console input
channels and mix masters include POLARITY switches which reverse
the + and – input connections. Applications include correcting for
reverse wired cables, correcting for microphone placement problems,
mixing two mics on a snare drum, one above the other below where
the diaphragms move in opposite directions, helping to reduce comb
filtering effects between speakers on stage, reducing interaction
between stage sound and the FOH PA, and in certain situations
helping to reduce feedback. Polarity is sometimes labelled ‘phase’ on
mixing consoles. Technically, ‘phase’ is not the correct term as it
implies a 180 degree time shift. Polarity simply reverses the wires. It
does not affect time. Before starting your mixing, check that all the
channel and mix polarity switches are correctly set, normally up (+).
Using the channel faders The channels provide 60mm trim
faders. It is typical to mix monitors with their channel sends set post-
fade. This means you can use the channel fader as a master level trim
for that source feeding all the mixes. Before you start balancing the
mix set the channel faders to their marked ‘0’ point for normal
operation.
If you prefer, you can set all or some of the sends pre-fade so that
they are not affected by the fader. For example, you could set the IEM
sends pre-fade so that the personal mix to each performer is not affect
when you make global changes to all the wedge speakers to adjust
stage volume for a particular instrument.
Using the built-in mic splitter The GL2800
GL2800GL2800
GL2800M
MM
M provides a
built-in passive mic splitter. Plug the stage sources into the monitor
console channel inputs. Connect the split outputs to the multicore
feeding the second console, typically FOH. Each console has
independent control of its sources. It is the same as using an XLR Y-
cable for one mic to feed two console channels. The GND LIFT switch
disconnects the pin 1 ground link between the input and split output
XLRs. Use this only if you experience audible hum due to a ground
loop problem associated with the wiring at your venue. If this is the
case you may need to select all the channel lift switches. Only in
extreme situations may it become necessary to consider using a much
more expensive transformer splitter solution to provide complete
isolation between the consoles. Start with all LIFT switches
deselected.
Phantom power and the monitor console Either or both
the monitor and FOH console may provide the 48V phantom power
without any problem or damage to the equipment. The power is
routed to the XLR pins via 6.8k ohm resistors which limit current and
prevent damage. Decide before the sound check which engineer
shall be responsible for providing the power. Typically the monitor
engineer would switch the power as he/she would be on stage helping
set up the microphones. Ensure that both the FOH and monitor
console mic channels are muted while the mics are being plugged
and power switched.
Zero the console Before starting the sound check it is good
practice to ‘zero’ the console by setting all its controls to a sensible
starting condition. Check that the GLOBAL SETTINGS and all other
mode switches are correctly set for your application. Set all GAIN, EQ
and PAN controls mid, faders off, TALKBACK and OSC/NOISE levels
off, TB enable switches off, PFL and AFL off, and all other switches up.
If you have configured stereo mixes start with their pan controls (even
numbered sends) set to their centre detented position. Make sure the
osc/noise generator is turned off. Cue Sheets are provided at the rear
of this guide for you to copy and log your control settings. This can
also be downloaded from our web site.
POLARITY
5
10
0
20
30
00
6
PAD PAD PA D PAD PAD PAD PAD PAD
M1
M2
M3
M4
5
10
0
20
30
00
6
PFL
PK!
+6
0
SIG
M1
M2
M3
M4
5
10
0
20
30
00
6
PFL
PK!
+6
0
SIG
M1
M2
M3
M4
5
10
0
20
30
00
6
PFL
PK!
+6
0
SIG
M1
M2
M3
M4
5
10
0
20
30
00
6
PFL
PK!
+6
0
SIG
M1
M2
M3
M4
5
10
0
20
30
00
6
PFL
PK!
+6
0
SIG
M1
M2
M3
M4
5
10
0
20
30
00
6
PFL
PK!
+6
0
SIG
M1
M2
M3
M4
5
10
0
20
30
00
6
PFL
PK!
+6
0
SIG
M1
M2
M3
M4
5
10
0
20
30
00
6
PFL
PK!
+6
0
SIG
6040-14 6
30
40
50
0
20
GAIN
100Hz
POLARITY
+48V
HPF
80Hz
12k
EQ IN
HF
+15
4k
15k
6k
1k
-15
500Hz
700
HM
3k
+15
250
1k
400
-15
70
35Hz
LM
45
180
+15
+15
-15
LF
-15
MUTE
16
9
OO
+6
10
+6
C
MIX
PAN
STEREO
MIX
OO
OO
MIX
PAN
MIX
C
+6
8
+6
OO
7
STEREO
OO
MIX
PAN
MIX
C
+6
6
+6
OO
5
STEREO
OO
MIX
PAN
MIX
C
+6
4
+6
OO
3
STEREO
OO
MIX
PAN
MIX
C
+6
2
+6
OO
1
STEREO
OO
MIX
PAN
MIX
C
+6
12
+6
OO
11
STEREO
OO
MIX
PAN
MIX
C
+6
14
+6
OO
13
STEREO
OO
MIX
PAN
MIX
C
+6
+6
OO
15
STEREO
LLL R
L R
L R
L R
L R
L R
L R
L R
6040-14 6
30
40
50
0
20
GAIN
100Hz
POLARITY
+48V
HPF
80Hz
12k
EQ IN
HF
+15
4k
15k
6k
1k
-15
500Hz
700
HM
3k
+15
250
1k
400
-15
70
35Hz
LM
45
180
+15
+15
-15
LF
-15
MUTE
16
9
OO
+6
10
+6
C
MIX
PAN
STEREO
MIX
OO
OO
MIX
PAN
MIX
C
+6
8
+6
OO
7
STEREO
OO
MIX
PAN
MIX
C
+6
6
+6
OO
5
STEREO
OO
MIX
PAN
MIX
C
+6
4
+6
OO
3
STEREO
OO
MIX
PAN
MIX
C
+6
2
+6
OO
1
STEREO
OO
MIX
PAN
MIX
C
+6
12
+6
OO
11
STEREO
OO
MIX
PAN
MIX
C
+6
14
+6
OO
13
STEREO
OO
MIX
PAN
MIX
C
+6
+6
OO
15
STEREO
LLL R
L R
L R
L R
L R
L R
L R
L R
0
20
GAIN
100Hz
POLARITY
+48V
HPF
80Hz
12k
EQ IN
HF
+15
4k
15k
6k
1k
-15
500Hz
700
HM
3k
+15
250
1k
400
-15
70
35Hz
LM
45
180
+15
+15
-15
LF
-15
MUTE
16
9
OO
+6
10
+6
C
MIX
PAN
STEREO
MIX
OO
OO
MIX
PAN
MIX
C
+6
8
+6
OO
7
STEREO
OO
MIX
PAN
MIX
C
+6
6
+6
OO
5
STEREO
OO
MIX
PAN
MIX
C
+6
4
+6
OO
3
STEREO
OO
MIX
PAN
MIX
C
+6
2
+6
OO
1
STEREO
OO
MIX
PAN
MIX
C
+6
12
+6
OO
11
STEREO
OO
MIX
PAN
MIX
C
+6
14
+6
OO
13
STEREO
OO
MIX
PAN
MIX
C
+6
+6
OO
15
STEREO
LLL R
L R
L R
L R
L R
L R
L R
L R
LF
-15
MUTE
16
9
OO
+6
10
+6
C
MIX
PAN
STEREO
MIX
OO
OO
MIX
PAN
MIX
C
+6
8
+6
OO
7
STEREO
OO
MIX
PAN
MIX
C
+6
6
+6
OO
5
STEREO
OO
MIX
PAN
MIX
C
+6
4
+6
OO
3
STEREO
OO
MIX
PAN
MIX
C
+6
2
+6
OO
1
STEREO
OO
MIX
PAN
MIX
C
+6
12
+6
OO
11
STEREO
OO
MIX
PAN
MIX
C
+6
14
+6
OO
13
STEREO
OO
MIX
PAN
MIX
C
+6
+6
OO
15
STEREO
LLL R
L R
L R
L R
L R
L R
L R
L R
6040-14 6
30
40
50
O
1
STEREO
OO
MIX
PAN
MIX
C
+6
12
+6
OO
11
STEREO
OO
MIX
PAN
MIX
C
+6
14
+6
OO
13
STEREO
OO
MIX
PAN
MIX
C
+6
+6
OO
15
STEREO
LLL R
L R
L R
L R
L R
L R
L R
L R
6040-14 6
30
40
50
0
20
GAIN
100Hz
POLARITY
+48V
HPF
80Hz
12k
EQ IN
HF
+15
4k
15k
6k
1k
-15
500Hz
700
HM
3k
+15
250
1k
400
-15
70
35Hz
LM
45
180
+15
+15
-15
6040-14 6
30
40
50
0
20
GAIN
100Hz
POLARITY
+48V
HPF
80Hz
12k
EQ IN
HF
+15
4k
15k
6k
1k
-15
500Hz
700
HM
3k
+15
250
1k
400
-15
70
35Hz
LM
45
180
+15
+15
-15
LF
-15
MUTE
16
9
OO
+6
10
+6
C
MIX
PAN
STEREO
MIX
OO
OO
MIX
PAN
MIX
C
+6
8
+6
OO
7
STEREO
OO
MIX
PAN
MIX
C
+6
6
+6
OO
5
STEREO
OO
MIX
PAN
MIX
C
+6
4
+6
OO
3
STEREO
OO
MIX
PAN
MIX
C
+6
2
+6
O
6040-14 6
30
40
50
0
20
GAIN
100Hz
POLARITY
+48V
HPF
80Hz
12k
EQ IN
HF
+15
4k
15k
6k
1k
-15
500Hz
700
HM
3k
+15
250
1k
400
-15
70
35Hz
LM
45
180
+15
+15
-15
LF
-15
MUTE
16
9
OO
+6
10
+6
C
MIX
PAN
STEREO
MIX
OO
OO
MIX
PAN
MIX
C
+6
8
+6
OO
7
STEREO
OO
MIX
PAN
MIX
C
+6
6
+6
OO
5
STEREO
OO
MIX
PAN
MIX
C
+6
4
+6
OO
3
STEREO
OO
MIX
PAN
MIX
C
+6
2
+6
OO
1
STEREO
OO
MIX
PAN
MIX
C
+6
12
+6
OO
11
STEREO
OO
MIX
PAN
MIX
C
+6
14
+6
OO
13
STEREO
OO
MIX
PAN
MIX
C
+6
+6
OO
15
STEREO
LLL R
L R
L R
L R
L R
L R
L R
L R
6040-14 6
30
40
50
0
20
GAIN
100Hz
POLARITY
+48V
HPF
80Hz
12k
EQ IN
HF
+15
4k
15k
6k
1k
-15
500Hz
700
HM
3k
+15
250
1k
400
-15
70
35Hz
LM
45
180
+15
+15
-15
LF
-15
MUTE
16
9
OO
+6
10
+6
C
MIX
PAN
STEREO
MIX
OO
OO
MIX
PAN
MIX
C
+6
8
+6
OO
7
STEREO
OO
MIX
PAN
MIX
C
+6
6
+6
OO
5
STEREO
OO
MIX
PAN
MIX
C
+6
4
+6
OO
3
STEREO
OO
MIX
PAN
MIX
C
+6
2
+6
OO
1
STEREO
OO
MIX
PAN
MIX
C
+6
12
+6
OO
11
STEREO
OO
MIX
PAN
MIX
C
+6
14
+6
OO
13
STEREO
OO
MIX
PAN
MIX
C
+6
+6
OO
15
STEREO
LLL R
L R
L R
L R
L R
L R
L R
L R
6040-14 6
30
40
50
0
20
GAIN
100Hz
POLARITY
+48V
HPF
80Hz
12k
EQ IN
HF
+15
4k
15k
6k
1k
-15
500Hz
700
HM
3k
+15
250
1k
400
-15
70
35Hz
LM
45
180
+15
+15
-15
LF
-15
MUTE
16
9
OO
+6
10
+6
C
MIX
PAN
STEREO
MIX
OO
OO
MIX
PAN
MIX
C
+6
8
+6
OO
7
STEREO
OO
MIX
PAN
MIX
C
+6
6
+6
OO
5
STEREO
OO
MIX
PAN
MIX
C
+6
4
+6
OO
3
STEREO
OO
MIX
PAN
MIX
C
+6
2
+6
OO
1
STEREO
OO
MIX
PAN
MIX
C
+6
12
+6
OO
11
STEREO
OO
MIX
PAN
MIX
C
+6
14
+6
OO
13
STEREO
OO
MIX
PAN
MIX
C
+6
+6
OO
15
STEREO
LLL R
L R
L R
L R
L R
L R
L R
L R
INPUT
GND LIFT
SPLIT
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