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Allen-Heath GL 2400 Manual

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GL2400 User Guide 31
Using the channel Direct Outputs Default factory setting is
pre-insert, pre-EQ, pre-fade so that your live fader mixing, effects and
EQ do not affect the recording. Change this to post-EQ using internal
jumpers if you prefer to use the EQ for source correction affecting the
recording too. You could also patch DIR OUT into a matrix EXT IN to
add a ‘more me’ channel into a monitor send created from the groups
and LR. If preferred you can reconfigure the direct outputs to post-
fade by setting internal jumpers. Use post for feeding an effects
processor with one source only, for example a dedicated reverb on
lead vocals, or to add more of one source into a matrix fed recording.
Using the Stereo Channels Stereo channels 15 and 16
present a unique flexibility. Each provides a microphone input and
two stereo inputs, a total of five connections which can feed the
channel or be routed elsewhere. The mic preamp has a TRS jack MIC
OUT breakpoint so that its output can be used independently.
Plugging into this socket breaks the signal path feeding the channel
and routes it to the jack instead. Each stereo input has its own level
control and can be routed either into the channel or directly to the LR
mix. This is configured using a recessed mode switch which protects
it from accidental operation during a show. With 2 mic and 4 stereo
line inputs, channels 15 and 16 provide for a host of space saving
applications:
Standard Mono Microphone Channels Mono mic input through the
channel with 4band EQ, auxes and full routing. Press the mode
switches to re-route the stereo inputs direct to LR for simple effects
returns and source inputs.
True Stereo Microphone Channel For example, use short jack
leads to patch both channel 15 and 16 MIC OUT breakpoints into ST2
stereo line input. Set ST2 level control to its mid ‘0dB’ position to feed
the channel. Adjust the gain and balance between the left and right
microphones using the two mic GAIN controls. Route ST1 to LR as a
simple effects return or source input. The other channel can be used
as a dual stereo input fed from ST3/4, or as a single ST4 input with
ST3 routed independently to LR.
Mixing Two Microphones through One Channel As above but
patch CH15 MIC OUT into ST1 L/M, and channel 16 MIC OUT into ST2
L/M. Set ST1 and 2 levels to mid ‘0dB’ position. This mixes the two
mics together in mono, for example when using one channel for two
choir microphones. CH16 is available for stereo line sources.
Patchable Microphone Preamplifier Disconnect the mic preamp
from the channel and patch it elsewhere to be used independently.
For example, plug in a room microphone and patch MIC OUT to a
matrix EXT IN to add ambience to a recording or monitor feed, or use
it as a preamplifier for a reference microphone with an RTA or other
analysis equipment. You could even use it to provide a better mic
source to a video camera or other recorder.
Dual Stereo Line Inputs A trademark of Allen & Heath consoles is
the ability to combine more than one source into the stereo channel,
each with its own level control. This can save channel space when
working with two similar sources routed to the same destination, for
example, two stereo reverb returns, two backing track or sound effects
players, or to alternate between walk-in music and recorded
announcement players.
Finally… A Note about Combining Signals You can use a
‘Y’ splitter cable or adapter to feed one output to two destinations, but
never try to combine two outputs to one destination. This may
damage or degrade the performance of the equipment driver stage.
DIRECT
OUT
24
MIC OUT
ST4 ST3 ST2 ST1
R
L/M
1516
MIC OUT
R
L/M
R
L/M
R
L/M
MIC INMIC IN
1516
(BREAKPOINT)
6
GAIN
20
60
50
40
30
+48V
GAIN
20
60
50
40
30
+48V
LR
-5
O
-10
-20
5
O
10
16
0
LR
MIC
ST2
LR
STEREO
MIC
LR
ST1
STEREO
ST4
STEREO
ST3
STEREO
CH15
CH15 CH16
CH16
6
-5
O
-10
-20
5
O
10
16
0
-5
O
-10
-20
5
O
10
16
0
-5
O
-10
-20
5
O
10
16
0
… 31 …


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