Allen&Heath GL4800 USER GUIDE - Manual (Page 21)

GL4800 User Guide 21
AUXILIARY SENDS - Route the channel signal to one or more
of 10 auxiliary send busses. These are independent from the
main outputs and may be used for effects sends and monitor
mixes. The sends are grouped 1-4, 5-8, and 9-10. Each group
may be selected pre or post channel fader. A further 6dB of
boost above 0dB normal channel level is available on the send
control.
Use post-fade for effects sends such as reverb. The amount of
signal sent to the effects unit follows the fader level and mute
switch. The processed ("wet") signal returned to the mix
through the return channel is therefore in proportion to the
direct ("dry") signal from the fader to the mix.
Use pre-fade for monitor sends such as to on-stage monitor,
backstage, orchestra pit, and musicians cue speakers. The
amount of signal in the monitor mix is independent of the fader
level. Pre-fade sends are post-EQ, post-mute as standard.
(may be configured pre-EQ or pre-mute by setting internal
links).
DIRECT OUT - The 0dBu post-fade channel signal is available
at the DIR OUT jack socket. For pre/post selection and
independent level control select the underpanel DIR OUT
mode switch. The 9-10 pre/post switch and aux 10 send
control now affect the direct out signal. Select POST for an
effects send dedicated to that channel (local effect) without
tying up a complete aux buss. Select PRE for a multitrack
recording send with independent level control.
MUTE - When illuminated the channel signal is turned off
(muted). This affects both pre and post fade signals unless the
pre-fade aux has been internally configured pre-mute. The
silent action mute element can be controlled by the switch,
mute groups, mute snapshots or via MIDI. The green
SAFE/PREVIEW LED indicates if the channel has been made
'safe' so that it is not affected by the mute groups, snapshots or
MIDI. It is also used when previewing or editing the groups
and snapshots.
ROUTING and PAN - The PAN control positions the channel
signal in the stereo mix. The post-pan signal may be routed
directly to the L-R mix or to the groups in odd/even pairs. The
groups may be used to feed additional outputs or recording
tracks, or for subgrouping combinations of channel signals to
the mix so that the overall level of the group can be controlled
without affecting the balance between the signals, for example
the drum kit mics. The pre-pan signal may be routed to the
MONO output independent of the stereo positioning.
METER and PFL - The peak reading meter displays the
channel signal pre-fader. Use this to monitor signal presence
and level. The signal should average around '0' with the
loudest peaking at '6'. If the red PEAK light flashes the signal
level is too high (5dB below clipping) and should be reduced
using the GAIN control to prevent possible overload distortion.
Press PFL to listen to the pre-fade signal on headphones or
engineers monitor without affecting the main outputs.
ODD
PAN
EVEN
=
L R
AUX
1
+6
+6
+6
+6
+6
+6
+6
+6
+6
AUX
2
AUX
3
4
AUX
AUX
5
6
AUX
7
AUX
AUX
8
AUX
9
AUX
10
0dB
0dB
0dB
0dB
0dB
0dB
0dB
0dB
0dB
0dB
+6
AUX
10
0dB
+6
PRE
POST
PRE
POST
PRE
POST