Tereo, Nput channel, Gl2200 – Allen&Heath GL2200 USER GUIDE User Manual
Page 13: Uide
GL2200
U
SER
G
UIDE
13
S
TEREO
I
NPUT CHANNEL
Two stereo input channels are included as standard. Each features a 4-band
EQ, 6 aux sends and group routing. Use this channel for stereo sources such
as keyboards and two track players, or for returning additional effects
processors to the mix and monitors. A mic input is included so that you can
use the channel for additional mics when needed. The stereo line input can still
be routed to the mix while using the channel mic input.
The stereo inputs are on separate TRS jacks. For mono line sources plug into
the L/MONO jack socket only. For microphone sources plug into the XLR.
48V selects +48V DC to the XLR input for microphones that require phantom
power.
IMPORTANT NOTE : Switch off channel +48V when non-phantom
powered or unbalanced sources are connected to the XLR input.
φ
reverses the POLARITY of the input source to correct problems often
encountered in microphone placement, or due to incorrectly wired cables (pin 3
hot instead of pin 2). May also be helpful in reducing acoustic feedback
between closely positioned loudspeakers and mics in live sound mixing.
GAIN controls for the MIC and LINE inputs let you adjust each source
independently.
LINE TO L-R routes the stereo line source direct to the L-R mix. In this way
both the mic and stereo line inputs may be used at the same time. The mic
can be routed through the stereo channel while the line input becomes an
independent source or return to the LR mix.
MIC/LINE selects either the mic XLR or the stereo line jack inputs to the
channel. When selecting LINE on the second stereo input channel, the MIC
input section is available as the source for talkback. A green LED indicator
illuminates to confirm this. The channel can be used with the stereo line input
in the normal way while the mic is independently used for talkback.
The 4-band stereo EQ lets you adjust the tonal quality of the sound. The HF
(treble) and LF (bass) bands have a shelving response, which means that all
frequencies beyond the corner frequency are affected. The 2 mid frequencies
MF1 and MF2 provide optimum control over boomy or boxy sounds (250Hz),
and can add bite or reduce harshness to keyboards, vocals etc. (2.5kHz). The
centre flat position is detented for quick resetting.
6 AUX SENDS provide feeds for foldback monitors and effects. Aux 1-4 and
Aux 5-6 may be set to pre or post-fader using the PRE switch. The left and
right stereo signals are summed to provide aux feeds in mono.
Monitor sends to the performers are usually set pre-fade (PRE), although
some sources such as radio mics are often set post-fade to avoid ‘dressing
room’ talk spill.
Effects sends to external signal processing equipment such as reverb and
delay effects units, are usually set post-fade so that the amount of effect (wet
signal) is always relative to the position of the fader (dry signal).
Adjust the amount of effect required for each channel using its AUX control.
The effect is returned to the mix through another channel, usually the stereo
return described later in this guide.
POST-FADE sends are post-EQ, post-mute. PRE-FADE sends are set post-
EQ, post-mute as standard. Internal link options are available to change the
source of the pre-fade sends. Refer to the internal link options section in this
user guide.
Note; AUX 1-6 feed XLR outputs with inserts when the GRP/AUX
REVERSE switches are pressed in the master section.
MIC TO TALK
ENABLE
MIC TO TALK
STEREO
15-16
60dB
LINE
50
L-R
20
10
30
40
TO
MIC
LINE
GAIN
12
Ø
48V
MIC
GAIN
LINE
250Hz
MF2
2.5kHz
MF1
+15
-15
0
+15
-15
0
+15
-15
0
+15
-15
0
EQ IN
HF
12kHz
60Hz
LF
+6
OO
0
+6
OO
0
+6
OO
0
+6
OO
0
+6
OO
0
+6
OO
0
6
AUX
AUX
5
AUX
4
AUX
3
2
AUX
1
AUX
PRE
PRE
MUTE
ODD
L
EVEN
R
C
PEAK
0
SIG
+6
L-R
BAL
PFL
5
5
10
0
1-2
3-4
OO
10
20
30
O
O
20
10
0