Allen&Heath ML4000 USER GUIDE - Manual (Page 21)

ML4000 User Guide 21
System Description
MONO INPUT and EQ. The input preamp
matches microphone or line level signals to the
console. The sweepable high pass filter removes
unwanted low frequency sounds below the selected
frequency. The channel insert is post filter, pre EQ.
A swept frequency 4 band equaliser provides
shelving high and low bands with adjustable shelf
frequency, and peak/dip high and low mid bands
with adjustable centre frequency and switched Q.
The filter and EQ can be independently switched in
or out.
GRP/AUX SENDS. This section provides controls
for the group routing and auxiliary sends. The
groups are routed in pairs and affected by the pan
control. The auxes are switched pre or post-fader
as groups 1-4, 5-8, 9-10, 11-12. Auxes 9-12 can be
configured as true stereo with level and pan
controls. The pre-fade settings can be changed
using internal jumper links.
MAIN MIX SENDS. A single switch routes the
channel signal to the main L, R and C outputs. The
balance between the three outputs is determined by
the LCRplus™ pan and blend controls. This
provides full 3 output imaging from each channel
and group.
INPUT FADERS. Includes the channel fader,
mute, signal meter and PAFL monitoring. The 8
VCA group assignments are displayed. VCA and
mute group editing and channel safe selection is
performed using the mute switch with green
safe/edit indicator below. The channels can be
monitored in mono PFL or stereo in-place AFL.
STEREO INPUT and EQ. The input preamp
accepts two stereo sources with independent
control of each. This allows selection of either or
mixing together both sources. A fixed frequency 4
band equaliser provides shelving high and low
bands and two peak/dip mid bands. The EQ can be
switched in or out.
GRP/AUX 1-8 FADER MASTERS. These are the
fader masters with inserts for channel sends 1-8,
configurable using mode switches as audio group or
pre/post aux masters. The groups can be routed to
the main mix through LCRplus controls to create
sub groups. LED meters display the pre-fade mix
levels.
AUX 9-12 MASTERS. These are the fader
masters with inserts for channel sends 9-12. They
can be AFL’d in mono or stereo.
AUX/GRP 1-8 FADER MASTERS. These are the
rotary masters for aux sends 1-8. They can be
reversed with the group fader masters together with
the inserts for full featured monitor mixing.
MAIN MIX FADERS. Provides separate master
faders, mutes and inserts for the main L, R and C
outputs. A mode switch configures the C output as
the engineers wedge monitor feed for the stage
monitor application.
MATRIX. This section provides all the controls for
the 4 matrix outputs, including the source and
master rotaries.
VCA GROUPS. These are the VCA group master
faders, mutes and PAFL monitor switches. Mute
and PAFL remotely activate the assigned channel
switches. Channels are assigned to the groups
using the edit key. The normal fader operating level
is marked ‘0’.
MUTE GROUPS. These are the master keys that
mute all channels assigned to the group. Channels
are assigned using the edit key.
MIDI CONTROLS Keys and indicators to action a
console data dump to external archiver via MIDI or
RS232, make selected channels automation safe,
and select the console MIDI channel number.
HEADPHONES / MONITOR. Provides source
selection and independent control of the
headphones and local monitor outputs.
PAFL CONTROL. This section controls how the
intelligent PAFL system functions and provides the
clear all key. Add or auto-cancel mode, and input
PFL/AFL are selected here.
OSC/NOISE GENERATOR. Enables and selects
a 1kHz tone or pink noise which can be routed to
any output for line up or system testing.
INTERCOM. The console talkback mic and
headphones can be interfaced to a ClearCom
compatible intercom system so eliminating the need
for a separate intercom headset.
TALKBACK. Pressing the talk switch routes the
talkback mic to any output with its TB enable switch
selected.
GRP/AUX 1-8 METERS. These moving coil VU
meters display the grp/aux 1-8 outputs.
LRC/PAFL METERS. The main L,R and C outputs
are simultaneously displayed on both VU and LED
bar meters. These switch to display any PFL or
AFL when selected. The display is mono or
mono+stereo depending on source. The large call
lamp lights to warn when the intercom is signalled.
AUX 9-12 / MTX 1-4 METERS. These meters
display either the aux 9-12 outputs or matrix 1-4
levels according to the setting of the meter select
switch.