ALLEN & HEATH GL4800 User's Guide Page 27

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GL4800 User Guide 27
MONO
2-TRACK STEREO RETURN - The incoming level can be
trimmed from OFF to +10dB gain and routed direct to the LR
mix for intermission or recording replay. Monitor the signal
post LEV trim and pre REPLAY switch using STEREO PFL
which automatically overrides the signal in the headphones
and local monitor.
AFL/PFL INDICATORS - Large red LED indicators show
when AFL or PFL is selected.
MONO METER - The MONO METER follows the post fade
mono mix signal and is interrupted to show the AFL or PFL
signal when selected.
PFL INTERRUPTS AFL - Pressing a PFL switch automatically
overrides any selected AFL. This is most useful in stage
monitoring when you may wish to continually monitor a
selected stage mix using AFL. You can quickly check the
channel signals by pressing PFL which cuts out the stage mix
monitor signal while selected.
STEREO PFL METERING - Press the switch above the mono
meter to allow any selected PFL to override the LR meters.
These meters will display PFL in stereo if a stereo source is
selected. If a mono source is selected both meters display the
mono PFL signal.
STEREO/MONO COMPATIBILITY - You can display and
listen to the mono compatibility of your stereo sources by
selecting a stereo PFL. The L and R meters display the signal
in stereo. The M meter displays the LR sum (mono) signal. A
low M meter reading compared with LR meters can indicate a
phase problem between L and R. This can be checked and
corrected using the stereo channel POLARITY (R) switch. You
can listen to the signal in mono by pressing the
STEREO/MONO switch in the console monitor section.
TALKBACK - Plug in a microphone and adjust TB LEV to talk
to the outputs you select on the talkback assign switches. An
internal link assigns +48V phantom power if required.
Talkback will be activated to the selected destinations when
you press the large TALK button. If any destination is selected
the green LED in the TALK button will light, useful if you want to
be sure that the talkback system is made 'safe' during the
show. You can talk to the 10 auxes in any combination, to the
M mix, LR mix, all 8 groups together, and all 4 matrix together.
AFL
PFL
ACTIVE
STEREO PFL
-30
-20
-15
-12
-9
-6
-3
0
+3
+6
+9
+16
48V
+V
-V
TO L-R
REPLAY
-5
-30
-20
0dB
+5
+10dB
+8
-2
-10
PFL
M
LEV
2TRK RETURN
MONO
TB TO
M
TB TO
L-R
TB TO
GRP
TB TO
MTX
TB
MIC IN
5
2
4
7
8
10
1
0
3
6
9
LEV
TB
TALK
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