Lr Section - ALLEN & HEATH GL4000 User Manual

THE CONSOLE MATRIX - The GL4000 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 (A to D) 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.
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