Multi-Speaker System Application - ALLEN & HEATH GL4800 User Manual

Multi-Speaker System
L2
3
2
1
2 DELAY
2
1 DELAY
1
DELAY
FILL
1
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.
GL4800
User Guide
6 Speaker system driven from the matrix and LR2
outputs. Provides output balance and level trim
independent of the mix levels.
balanced XLR with inserts for EQ, delay or other
signal processors.
POWER AMPLIFIERS
R2
L2
4
3
MODE MONITOR STAGE 1 MONITOR 2 MONITOR 3 MONITOR 4 MONITOR 5 MONITOR 6 MONITOR
IN
MIC
LINE MTX1 MTX2 MTX3
AUX 1 2 3 4 5 6
AUX AUX AUX AUX AUX AUX
IN RET RET RET RET RET RET RET RET RET RET RET RET RET RET RET
LINE
INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT
SEND SEND SEND SEND SEND SEND SEND SEND SEND SEND SEND SEND
RET
INSERT
SEND
GRP 1 2 3 4 5 6
OUT
GRP GRP GRP GRP GRP GRP
DIRECT
RET RET RET RET RET RET
INSERT INSERT INSERT INSERT INSERT INSERT
SEND SEND SEND SEND SEND SEND
output
1 2
control
LAMP
+48V
-15 -15
-20 LEV -20
-10
-30 -30
POLARITY -5
0dB
GL4800
MIC
ON
LINE
0dB
PAD
20
30 10
AFL
-10 40
10 GAIN
MULTI FUNCTION AUDIO MIXING CONSOLE
50
LINE
MIC
-14 6 60 40dB
50Hz
HPF OUT REV OUT REV
30 100
20 200
POST POST POST POST POST
PRE PRE PRE PRE PRE
OFF 400Hz
7kHz -15 OUTPUT -15 OUTPUT -15 OUTPUT -15 OUTPUT -15 OUTPUT -15
-20 -20 -20 -20 -20 -20
3k 10k -10 TRIM -10 TRIM -10 TRIM -10 TRIM -10 TRIM
-30 -30 -30 -30 -30 -30
-5 -5 -5 -5 -5
2kHz 20kHz
0dB GRP 0dB GRP 0dB GRP 0dB GRP 0dB GRP
HF
1 2 3 4 5
ENABLE ENABLE ENABLE ENABLE ENABLE ENABLE
-15
+15
1 2 3 4 5 6
Q
3k +16 +16 +16 +16 +16 +16
1k
5k
+9 +9 +9 +9 +9 +9
700 7k
+6 +6 +6 +6 +6 +6
500Hz 15k
All outputs are
GRAPHIC EQ
R2
L2
4
3
inserts
7 MONITOR 8 MONITOR 9 MONITOR 10 MONITOR WEDGE LISTEN
(BACKUP) (MAIN)
R
MTX4 L2 R2
7 9 10
M
AUX AUX AUX AUX
B A
IN POWER DC
RET RET RET RET RET RET RET RET RET RET RET RET RET RET RET RET RET RET RET RET
L
RETURN
INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT GROUND
2-TRACK
CHASSIS
SEND SEND SEND SEND
SEND SEND SEND SEND SEND SEND SEND SEND SEND SEND SEND SEND SEND SEND SEND SEND
REV OUT = INSERTS + XLR ON MATRIX/LR2 FOR
MODE
OUT2
9 AUX10
L R
2 2
MATRIX
7 8 L R
GRP GRP
5 6 7 AUX8
RET RET 1 2 3 4 RET RET RET RET RET
MTX
METERPOD
INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT INSERT
SEND SEND SEND SEND SEND SEND SEND SEND SEND SEND
L R
LOCAL
3 4 L R
LAMP
-15 -15 -15 -15
LEV -20 LEV -20 LEV -20 LEV -20 LEV
-10 -10 -10 -10 -10
-30 -30 -30 -30 2TRK RETURN
-5 -5 -5 -5 -5
LEV
0dB 0dB 0dB 0dB 0dB -5 -2
0dB
-10
ON ON ON ON ON
-20 +5
-30 +8
AFL AFL AFL AFL AFL +10dB
REPLAY
TO L-R
OUT REV OUT REV OUT REV OUT REV
POST POST POST POST POST
PFL
PRE PRE PRE PRE PRE
OUTPUT -15 OUTPUT -15 OUTPUT
-20 -20
-10 TRIM -10 TRIM -10 TRIM
-30 -30 AFL
-5 -5 -5
ACTIVE
0dB GRP 0dB GRP 0dB GRP
PFL
6 7 8
ENABLE ENABLE
STEREO PFL MONO
7 8 L R M
SNAPSHOT
+16 +16 +16 +16 +16
+9 +9 +9 +9 +9
+6 +6 +6 +6 +6
4
GL4800
IN
MIC
LINE
RET
INSERT
XLR
SEND
OUT
R
IN press
THRU
LINE
STEREO
MIDI /MONO L
mode
IN
RESET switches
+48V DELAY
POLARITY POLARITY
FILL
MIC
LINE
0dB
PAD
20
30 10
-10 40 XLR
10 GAIN
50 2
LINE
MIC
-14 6 60 40dB
50Hz
HPF
30 100
20 200
OFF 400Hz
POLARITY
(R)
STEREO
WIDTH
MONO
REVERSE WIDE
-5 0dB
STEREO
-10
+5 GAIN
-20
-30
+10dB
DIRECT
TO
L-R
55
R2