Allen&Heath GL4800 USER GUIDE - Manual (Page 55)

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 subgroups 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
2 3 4 5 6 7 8 L R M
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
L2 R2 MTX1 MTX2 MTX4 MTX3
MTX
(MAI N)
R
GL 4800
R
MIC
LINE
IN
SEND
XLR INSE RT
RET
STER EO
LINE IN
L /MON O
SEND
RET
INSE RT
SEND
RET
INSE RT
M
RETU RN 2-TR ACK
R
L
GROU ND CH ASSIS
RESE T
THRU
MIDI
IN
OUT
9 AUX10 2 2 L R
FO R MAT RIX /LR2 ON XLR + INSE RTS = MODE OUT R EV
AUX8 7 6 5
LOCA L
4 3 2 1
METE RPOD
DIR ECT OUT
INSE RT
RET
SEND
LINE
IN MIC
LINE
IN
1 2 4 3
1 2 4 5 6 7 8 3
GRP
INSE RT
RET
SEND
GRP
INSE RT
RET
SEND
GRP
INSE RT
RET
SEND
GRP
INSE RT
RET
SEND
GRP
INSE RT
RET
SEND
GRP
INSE RT
RET
SEND
GRP
INSE RT
RET
SEND
GRP
INSE RT
RET
SEND
AUX
INSE RT
RET
SEND
AUX
INSE RT
RET
SEND
AUX
INSE RT
RET
SEND
AUX
INSE RT
RET
SEND
RET RET RET
L
SEND
RET
INSE RT
SEND
RET
INSE RT
SEND
RET
INSE RT
SEND
RET
INSE RT
AUX
5
SEND
RET
INSE RT
SEND
RET
INSE RT
SEND
RET
INSE RT
SEND
RET
INSE RT
AUX
6
SEND
RET
INSE RT
SEND
RET
INSE RT
SEND
RET
INSE RT
SEND
RET
INSE RT
AUX
7
SEND
RET
INSE RT
SEND
RET
INSE RT
SEND
RET
INSE RT
SEND
RET
INSE RT
AUX
SEND
RET
INSE RT
SEND
RET
INSE RT
SEND
RET
INSE RT
SEND
RET
INSE RT
AUX
9
SEND
RET
INSE RT
SEND
RET
INSE RT
SEND
RET
INSE RT
SEND
RET
INSE RT
AUX
10
L R
INSE RT
SEND
INSE RT
SEND
INSE RT
SEND
INSE RT
SEND
RET
INSE RT
RET
SEND
INSE RT
RET
SEND
INSE RT
RET
SEND
INSE RT
RET
SEND
MONI TO R 1 0 MONI TOR 9 MON ITO R 8 MON ITO R 7 MON ITOR 6 MO NIT OR 5 MO NIT OR 4 MON ITO R 3 MO NIT OR 2 MONI TO R 1 STAG E MONI TOR MOD E
DC POW ER I N A
(BAC KUP )
B
LIST EN W EDG E
OUT2
MATR IX
SEND
RET
INSE RT
SEND
RET
INSE RT
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 AUDIO 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
400Hz OFF
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
400Hz OFF
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
POLARITY POLARITY
POLARITY (R)
GRAPHIC EQ
3
4
R2
3 4
press
mode
switches
L2
1 2 3 4 L R
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