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The STEREO Input Channel (if fitted)
+48V
POLARITY
LINE
(PAD)
0
30
40
20
GAIN
50
-14
6
60 40
HPF
100Hz
STEREO
-5
GAIN
-10
0
-20
5
-30
O
O
16
HF
12k
-15
+15
HM
2k5
-15
+15
LM
250Hz
-15
+15
LF
80Hz
-15
+15
EQ IN
AUX
1
OO
+6
AUX
2
+6
OO
AUX
3
+6
OO
AUX
4
+6
OO
POST
PRE
AUX
5
OO
+6
AUX
6
+6
OO
AUX
7
O O
+6
AUX
8
O O
+6
POST
PRE
AUX
9-10
STEREO
O O
+6
=
BAL
L
R
POST
PRE
=
BAL
L
R
ODD
EVEN
MUTE
PFL
PK!
+6
0
SIG
10
M
5
L-R
0
1-2
5
3-4
10
5-6
7-8
20
M1
30
M2
M3
00
M4
18
Each GL3800 stereo channel features a mono microphone preamp
as well as a stereo line input. These sources can be mixed together
into the channel or split using the mic breakpoint, so providing a
unique flexibility. For example, you could patch the mic stage as an
independent preamp for an ambience microphone feeding a
recording, or for a system calibration microphone, while the stereo line
input returns an external effects processor to the mix. Two stereo
channels could be linked so that the mic preamps cross patch to
provide one stereo mic and one stereo line channel.
MIC INPUT
Similar to the mono channel microphone preamplifier.
A rear panel MIC OUT breakpoint socket is provided so that the mic
stage can be used independently. Plugging a jack into the MIC OUT
socket breaks its signal path to the stereo channel.
WARNING: Do not connect unbalanced sources or cables to
inputs with phantom power selected. To avoid loud clicks always
mute the channel before switching +48V on or off and when
plugging or unplugging microphones.
STEREO LINE INPUT
+16dB gain. The L input signal is normalled through the R input
socket so that a mono source may be plugged in to feed both left and
right sides of the stereo channel.
EQ
Similar to the mono channel, but the two peak/dip mid bands
are fixed at 250Hz and 2.5kHz centre frequencies.
AUX SENDS
These work as described for the mono channel, but
the L and R sides of the stereo signal sum together to feed Auxes 1 to
8 in mono. Aux 9-10 is fed with the stereo signal. The auxes can be
switched pre or post-fader but are always sourced post-EQ.
BAL
Balances the level of the L signal against the R signal to
compensate for differences in the source, or to position the signal
within the stereo image.
MUTE
When pressed, all the channel pre and post-fade signals are
turned off except the MIC OUT and any stereo routed direct to LR.
PFL
Press PFL to display the summed L+R pre-fade channel signal
on the monitor meters and listen to it in the headphones and local
monitor without affecting the main outputs.
METER
As the mono channel, but the left and right signals are
summed to display in mono.
ROUTING
As the mono channel, but routes the left signal to L and
odd groups, right signal to R and even groups, and sums L and R to
feed the M mix in mono.
FADER
The 100mm dual rail fader provides +10dB maximum
boost above its normal unity gain 0dB position
MUTE GROUPS
Assign the stereo channel to any combination of
the 4 mute groups by pressing these switches.
A level control adjusts from fully off to
GL3800 User Guide
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