System Block Diagram - ALLEN & HEATH GL4800 User Manual

Mode Switching
Protected underpanel mode switches set the console architecture according to the required application,
for example FOH or stage monitor. Select these using a pointed object.
DIR OUT routes the channel direct out
signal through the aux 10 pre/post
selector and level control.
OUT REV
OUT REV swaps the matrix or LR2 output
jack with the related aux XLR and insert.
The control sections are not swapped.
This can provide matrix outputs on XLR
with inserts, or aux effects sends on jack
as required.
-15
-20
-10
-30
-5
0dB
ENABLE
Output Trim ENABLE routes the group
output signal through a pre/post fader
selector and level trim.
record the groups independent of the
subgrouping to LR and M.
MTX
1
TO AUX1
MTX TO AUX Links the matrix mix into the
aux mix to include aux sends from the
groups, LR and M. Used for effects from
the groups, and for quick monitor mixes.
GRP REV
GRP REV reverses the aux (small fader)
and group (main fader) control sections.
Also applies to LR. The outputs remain
unaffected. This mode is used for stage
monitoring.
WEDGE MODE
M MIX
AFL/PFL
MONO MODE converts the mono output
to the monitor engineers listen wedge. M
AFL is disabled. The M mix still feeds the
insert and matrix.
12
LINE IN
BAL
MIC/LINE IN
+48V
INSERT
0dBu
TIP = +
RING = -
INPUT CHANNEL
OUTPUT
TRIM
DIRECT OUT
GRP
8 IMPEDANCE BALANCED
This lets you
STEREO CHANNEL
MIC IN
+48V
INSERT
0dBu
TIP = +
RING = -
STEREO LINE IN
STEREO
LINE IN
TIP = +
RING = -
GL4800

SYSTEM BLOCK DIAGRAM

4-BAND FULL SWEEP
EQUALISER
MIC/
HF
LINE
LO-CUT
-20dBu
GAIN FILTER
MF1
EQ IN
2= +
MF2
SEND
LF
RETURN
+
-
BAL
INTERNAL AUX LINK OPTIONS
AUX 10/
DIR OUT LEVEL
PRE FADER
-
POST FADER
POST
0dBu
PRE
TIP = +
AUX 10
RING = -
AUX 9
4-BAND
EQUALISER
MIC IN
HF
LO-CUT
GAIN FILTER
PAD
MF1
-20dBu
EQ IN
2= +
MF2
SEND
LF
RETURN
L
MIC
INTERNAL AUX LINK OPTIONS
STEREO
R
STEREO PFL
GAIN
L/MONO
+
- WIDTH
DIR TO L-R
L
R
R
R
+
-
BAL
POST
PRE
AUX 10
AUX 9
TALKBACK
TB MIC IN
2= +
LINK
BAL
PEAK
+6
0dB
SIG
PFL
FADER
MONO
L-R
PAN
1-2
-
3-4
5-6
7-8
MUTE
SAFE/PREVIEW
POST-MUTE
PRE-MUTE
POST-EQ
-
PRE-EQ
AUX 1
PRE-FADE
SWITCHED
POST-FADE
AUX 2
AUX 3
AUX 4
POST
PRE
AUX 5
AUX 6
AUX 7
AUX 8
POST
PRE
PEAK
+6
0dB
SIG
STEREO PFL
FADER
MONO
L-R
PAN
1-2
-
3-4
5-6
SUM
7-8
MUTE
SAFE/PREVIEW
POST-MUTE
PRE-MUTE
POST-EQ
SUM
-
PRE-EQ
AUX 1
PRE-FADE
SWITCHED
POST-FADE
AUX 2
AUX 3
AUX 4
POST
PRE
AUX 5
AUX 6
AUX 7
AUX 8
POST
PRE
ENABLE
TB TO MONO
TB LEV
TB TO L-R
TB TO GRPS
TALK
TB TO MTX
TB ENABLED
DIM
+48V
GL4800
User Guide