User guide
Allen & Heath 20 WZ
4
16:2 and 12:2 User Guide
ST2 (ST6) RETURN
This is a simple stereo return channel that
routes to the main LR mix. The typical application is to plug in a CD or
similar playback device for walk-in or background music. It can also be used
as an additional effects return. Adjust the volume using the LEV control.
Route the signal to LR by pressing the TO LR switch. The green LED lights
to warn that the source is routed to LR.
You can use the ST2 (ST6) input to monitor your 2-track recording. Press
the ST2 (ST6) monitor source select switch. Use the AB output to feed
your recorder. If you are monitoring while mixing live, make sure you do
not accidentally press the TO LR switch and route your recording to the
house speakers.
Console Monitor Comprehensive engineer’s headphones monitoring is
provided. Select the source to listen to using the monitor switch bank.
With no switch pressed the post-fade LR mix is monitored. Press M to lis-
ten to the post-fade M source. Pressing any switch higher up the bank over-
rides the previous selection. Pressing ST1 (ST5) listens to the wet effects
only return signal if the internal effects processor is active. Pressing Aux
pairs 1-2, 3-4, 5-6 together listens to the two selected auxes as a stereo pair.
The two console meters display the selected monitor source signal level.
Pressing channel PFL switches automatically overrides the current monitor
selection with the pre-fade signal from that channel or selection of channels.
The red PFL active indicator lights and the console meters display the chan-
nel signal.
We recommend you use closed ear headphones in the range 30 to 600 ohms
designed for live sound monitoring. Headphones around 100 ohms imped-
ance are a popular choice.
WARNING: To avoid damage to your hearing do not oper-
ate any close-to-ear monitoring such as headphones for long peri-
ods at high volume. Continued exposure to high volume sound can
cause frequency selective or wide range hearing loss.
AB OUTPUT
This is an additional stereo output that can be config-
ured as a separately controlled mix output or a local loudspeaker monitor
send. A recessed mode switch above the AB level control selects the
source. Use a pen or pointed object to change the setting. Adjust the out-
put level from fully off to a maximum +10dB boost. The normal 0dB position
is marked on the panel.
With the mode switch in its up position, the LR mix is selected as the source
to the AB output TRS jacks. Factory default setting is post-LR fader. If pre-
ferred you can change this to pre-LR fader by repositioning internal option
jumpers so that the LR master fader movements do not affect the output. In
LR mode the AB output provides an additional main mix output ideal for
independent fill speaker control, 2-track recording or broadcast feed and so
on.
With the mode switch pressed, the console monitor system is selected as
the source. You can use this to feed local monitor speakers to listen to the
source selected on the monitor switch bank interrupted by PFL. Local
speaker monitoring can be useful in theatre and stage monitoring applica-
tions.
6
AUX
OO
+10
AB
ALT LR OUT
MONITOR
ALL UP = LR
M
ST6
ST5
-30
-20
-16
-12
+3
+6
+9
+16
5-6
3-4
1-2
0
PFL
L
-3
-9
-6
0
3
AUX
5
AUX
4
AUX
2
AUX
1
AUX
10
R
ST6/USB
LEV
OO
TO LR
0
/ FX
POWER