Allen&Heath GL4800 USER GUIDE - Manual (Page 25)

GL4800 User Guide 25
THE CONSOLE MATRIX - The GL4800 includes a versatile 11 x
4 output matrix. This comprises four independent outputs each with
level control, ON switch and AFL monitoring. Each matrix mix is
created from the desired combination of group (x8), L (left), R (right)
and M (mono) signals. The level of each source is adjusted using the
matrix SEND controls above the main faders in much the same way as
the channel aux sends are used. The output is selectable to a TRS
jack or XLR with insert.
Typical applications of a matrix include:
Additional speaker feeds for zoning and delay fills - The
mix may not be exactly the same as that feeding the LR
speakers. For example, the vocals may be boosted to aid
clarity for listeners at the rear of the venue. It is common to
insert a delay unit to compensate for acoustic delay if the
speaker is positioned a significant distance from the stage.
Some EQ may also be required.
Recording - It is seldom adequate to record live to 2-track
from the LR mix. Typically the LR house mix is 'vocal heavy' as
much of the instrument sound is heard acoustically and the PA
is used to supplement the sound. Use two matrix outputs and
create a more balanced mix for the recording using the matrix
sends. Here, the 'backline' sound can be boosted on the
related group send controls.
Video and Broadcast feeds - The mix may be balanced and
stereo image set as required without affecting the PA mix.
Often a mono broadcast feed is asked for. Set this up by
mixing in equal amounts of the L and R mix.
MATRIX SENDS - These route the group signal to one or more of 4
matrix mix busses. The source may be selected pre or post group
fader. The level may be adjusted from off to +6dB boost. The normal
'0' level is marked on the control dial. The matrix source is always fed
from the groups even if GRP REVERSE is selected.
MATRIX TO AUX LINK - Aux masters 1 to 4 include this underpanel
mode switch. When pressed this links the related matrix mix (1 to 4)
to the aux mix. This unique feature lets you extend the aux mix across
the master section so that monitors and effects can be created from
the groups, L, R and M, pre or post fader. Similarly, the aux output
may be used as a matrix created from the master section and with
additional feeds from the channels.
GROUP MASTER - The group mix is normally controlled using the
100mm main fader. If GRP REVERSE is selected this section controls
the aux mix. A pre fader group meter is included to display signal
activity and warn of mix overload. The MUTE switch is part of the
console mute grouping and automation system and includes preview
and safe. AFL monitors the signal post insert and post fader.
SUBGROUPING - The post fader group signal can be routed to the
main L-R and/or M outputs by pressing the switches to the left of the
fader. PAN adjusts the position of the signal between L and R.
Routing a combination of channel signals to a group and then routing
the group to the main mix lets you control the level of the combined
signals with a single fader. Routing and panning to a pair of groups
and then panning them L and R lets you subgroup in stereo.
Subgroups are typically used for drum kits, vocals, stage mics,
backline instruments etc.
GRP
8
MTX
+6
0dB
+6
MTX
0dB
+6
MTX
0dB
+6
MTX
0dB
PAN
L R
=
PRE
POST
1
2
3
4