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ALLEN & HEATH GL4800 User's Guide Page 55

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GL4800 User Guide 55
Multi-Speaker System
6 Speaker system driven from the matrix and LR2
outputs. Provides output balance and level trim
independent of the mix levels. All outputs are
balanced XLR with inserts for EQ, delay or other
signal processors.
Output Level Matching and Balance
This example shows the matrix and LR2 outputs feeding the speaker system. Here all the
output controls are grouped together at the top of the panel away from the normal
operating area. Select POST for LR2 so that the output follows the LR faders. Adjust LEV
to match the operating level of each amplifier to give the desired listening level with
optimum console signals (faders and meters operating around '0'). A correctly matched
system ensures the best signal-to-noise and headroom performance. The balance between
the speakers can also be adjusted using LEV. Press ON to turn on or off selected speakers
in the system, useful in checking the effect of each. Use AFL to monitor each output post
level control but pre ON switch.
Output Drive and Inserts
Select OUT REV for interference free balanced XLR drive to the amplifiers. This also
provides an insert on each output for graphic EQ, delays and other signal processing
devices. Inserting graphics lets you tune the frequency response of each speaker in the
system for best clarity, acoustic correction and feedback reduction.
The Matrix Mix and Delay Speakers
Use the matrix to create the required mix to the delay speakers which improves the
intelligibility of the sound to the rear of the audience. The balance of the group signals to
the matrix may be different to the su/jointfilesconvert/385635/bgroups feeding LR to ensure that the focus of the
sound is not lost. Insert a delay unit to compensate for the acoustic delay from stage to
speakers. Insert a graphic EQ to compensate for the local acoustics and to remove some
LF and HF which may distract the listener from the true source of the sound.
1
+6
+9
+16
OUT REV OUT REV OUT REV OUT REV OUT REV OUT REV
-20
0dB
+5
+10dB
LEV LEV LEV LEV LEV LEV
+8
-2
-10
PRE
POST
PRE
POST
OUTPUT
TRIM
ENABLE
PFL
2345678 LRM
LEV
2TRK RETURN
MONO
GRP
1
PRE
POST
-15
-30
-20
-10
-5
0dB
OUTPUT
TRIM
ENABLE
GRP
2
PRE
POST
-15
-30
-20
-10
-5
0dB
OUTPUT
TRIM
ENABLE
GRP
3
PRE
POST
-15
-30
-20
-10
-5
0dB
OUTPUT
TRIM
ENABLE
GRP
4
PRE
POST
-15
-30
-20
-10
-5
0dB
OUTPUT
TRIM
ENABLE
GRP
5
PRE
PRE
POST
AFL
PFL
-15
-30
-20
-10
-5
0dB
-15
-30
-20
-10
-5
0dB
-15
-30
-20
-10
-5
0dB
-15
-30
-20
-10
-5
0dB
-15
-30
-20
-10
-5
0dB
-15
-30
-20
-10
-5
0dB
-15
-30
-20
-10
-5
0dB
AFL AFL AFL AFL AFL AFL
ON ON ON ON ON ON
ACTIVE
STEREO PFL
+6
+9
+16
+6
+9
+16
+6
+9
+16
+6
+9
+16
+6
+9
+16
+6
+9
+16
+6
+9
+16
+6
+9
+16
+6
+9
+16
+6
+9
+16
TO L-R
REPLAY
SNAPSHOT
-5
-30
AUX
GRP
L2R2 MTX1MTX2MTX4 MTX3
MTX
(MAIN)
R
GL4800
R
MIC
LINE
IN
SEND
XLR
INSERT
RET
STEREO
LINE
IN
L
/MONO
SEND
RET
INSERT
SEND
RET
INSERT
M
RETURN
2-TRACK
R
L
GROUND
CHASSIS
RESET
THRU
MIDI
IN
OUT
9AUX10
22 LR
FOR MATRIX/ LR2 ON XLR + INSERTS =
MODE
OUT REV
AUX8
765
LOCAL
4321
METERPOD
DIRECT
OUT
INSERT
RET
SEND
LINE
IN
MIC
LINE
IN
1243
12456783
GRP
INSERT
RET
SEND
GRP
INSERT
RET
SEND
GRP
INSERT
RET
SEND
GRP
INSERT
RET
SEND
GRP
INSERT
RET
SEND
GRP
INSERT
RET
SEND
GRP
INSERT
RET
SEND
GRP
INSERT
RET
SEND
AUX
INSERT
RET
SEND
AUX
INSERT
RET
SEND
AUX
INSERT
RET
SEND
AUX
INSERT
RET
SEND
RETRETRET
L
SEND
RET
INSERT
SEND
RET
INSERT
SEND
RET
INSERT
SEND
RET
INSERT
AUX
5
SEND
RET
INSERT
SEND
RET
INSERT
SEND
RET
INSERT
SEND
RET
INSERT
AUX
6
SEND
RET
INSERT
SEND
RET
INSERT
SEND
RET
INSERT
SEND
RET
INSERT
AUX
7
SEND
RET
INSERT
SEND
RET
INSERT
SEND
RET
INSERT
SEND
RET
INSERT
AUX
SEND
RET
INSERT
SEND
RET
INSERT
SEND
RET
INSERT
SEND
RET
INSERT
AUX
9
SEND
RET
INSERT
SEND
RET
INSERT
SEND
RET
INSERT
SEND
RET
INSERT
AUX
10
LR
INSERT
SEND
INSERT
SEND
INSERT
SEND
INSERT
SEND
RET
INSERT
RET
SEND
INSERT
RET
SEND
INSERT
RET
SEND
INSERT
RET
SEND
MONITOR 10 MONITOR 9 MON ITOR 8 MONITOR 7 MON ITOR 6 MONITOR 5MONITOR 4MONITOR 3MONITOR 2MONITOR 1 STAGE MONITOR MODE
DC POWER IN
A
(BACKUP)
B
LISTEN WEDGE
OUT2
MATRIX
SEND
RET
INSERT
SEND
RET
INSERT
POST
-15
-30
-20
-10
-5
0dB
OUTPUT
TRIM
ENABLE
GRP
6
PRE
POST
-15
-30
-20
-10
-5
0dB
OUTPUT
TRIM
ENABLE
GRP
7
PRE
POST
-15
-30
-20
-10
-5
0dB
OUTPUT
TRIM
ENABLE
GRP
8
GL4800
LAMP LAMP
MULTI FUNCTION A UDIO MIXING CONSOLE
3k
700
500Hz
1k
7k
15k
5k
-15
+15
7kHz
2kHz
3k
20kHz
10k
HF
+48V
10
-10
GAIN
20
0dB
40dB
60
50
40
30
10
6
MIC
LINE
-14
200
HPF
400HzOFF
20
100
50Hz
30
Q
LINE
MIC
PAD
POLARITY
TO
L-R
DIRECT
+48V
10
-10
20
0dB
40dB
60
50
40
30
200
HPF
400HzOFF
20
100
50Hz
30
10
6
MIC
LINE
-14
LINE
MIC
PAD
-5
-20
-10
+5
+10dB
0dB
-30
REVERSE
WIDE
MONO
WIDTH
STEREO
GAIN
STEREO
GAIN
XLR
POLARITYPOL ARITY
POLARITY
(R)
GRAPHIC EQ
3
4
R2
3
4
press
mode
switches
L2
1234 LR
inserts
output
control
DELAY
FILL
1
DELAY
FILL
2
R2
L2
4
3
DELAY
DELAY
2
1
2
1
1
2
POWER AMPLIFIERS
R2
L2
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