Allen&Heath ML4000 USER GUIDE - Manual (Page 40)

40 ML4000 User Guide
VCA GROUP FADER. The fader adjusts the level
of all channels assigned to the group. The ‘0’
position is referred to as the ‘nominal’ operating
setting. At this position the channel levels are as
marked on the channel faders. Any adjustment
made to the group fader offsets the channel level by
that amount. It is best to start with the group faders
set to their ‘0’ position.
At minimum position the fader shuts off all assigned
channels. At maximum position it provides a further
+10dB boost. Note that the maximum boost that
may be applied to the channel VCA is +10dB
regardless of how many group faders are assigned
and set above ‘0’.
The following diagrams illustrate the combined
channel gain when assigning more than one VCA
group. In this case the final gain is affected by the
channel fader and three VCA groups.
Example 1. A 0dBu signal is passed through the
channel. The fader attenuates this by 5dB. Group1
attenuates it by a further 10dB to –15dBu. Group2
boosts by 5dB bringing it up to –10dBu. Group3 is
set to ‘0’ resulting in the final level of –10dBu.
Example 2. Once again the channel fader
attenuates the signal to –5dBu. However, Group1
is set to minimum turning the signal off. There is no
output regardless of the setting of Groups 2 and 3.
Example 3. Here the channel fader and Groups 1
and 2 faders are set for +10dB boost. The result is
the channel VCA reaching its maximum of +10dB
regardless of the combined 30dB boost. It is best to
work with the faders around ‘0’ and avoid excessive
boost.
EDIT GROUPS. Press this switch to put the
console into edit groups mode. The red LED
flashes to warn that the console is in edit mode.
Press at any time while the LED is flashing to
restore normal operating mode. All the VCA group
MUTE LEDs and channel SAFE/EDIT LEDs turn off
when edit mode is first entered. This means that no
group is selected for editing.
The same edit groups mode is used to edit both the
mute and VCA groups. Pressing the associated
master switch while in edit mode selects the mute
group or VCA group you want to edit.
Only one group may be edited at a time. The
current assignments for all groups are always
displayed on the channel VCA assign LEDs.
To Assign a VCA Group
Press EDIT GROUPS. Next, press the MUTE
switch for the group you want to edit. Both switches
flash. The channel SAFE/EDIT LEDs display which
channels are currently assigned to the group. Now
press the channel MUTE switches to toggle
channels in or out of the group. Press EDIT
GROUPS again to exit edit mode, or press another
group mute switch to edit a different group.
CHANNEL GROUP 1 GROUP 2 GROUP 3
+10
+5
0
-5
-10
-15
-20
-40
off
-30
IN
OUT
0dB
-10dB
+15
+20
-5
-10
+5
0
CHANNEL GROUP 1 GROUP 2 GROUP 3
+10
+5
0
-5
-10
-15
-20
-40
off
-30
IN
OUT
0dB
off
+15
+20
-5
off
+5
0
Example 1
Example 2
CHANNEL GROUP 1 GROUP 2 GROUP 3
+10
+5
0
-5
-10
-15
-20
-40
off
-30
IN
OUT
0dB
+10dB
+15
+20
+10 +10 +10
0
(max)
Example 3
PAFL
M
U
T
E
SAFE
EDIT
GROUP
SELECT GROUP TO EDIT
MUTE
NOM
ASSIGN USING CH MUTES
5
0
10
5
5
0
10
5
4
3
2
1
PAFL
MUTE
PK
-6
SIG
+6
0
SAFE/EDIT