User Manual
Allen & Heath    25   ZED-4 BUS User Guide 
1 
MAIN METERS & TALKBACK 
1 
Main Meters 
The main Left & Right meters will show the signal level 
at the main LR mix outputs or the main M mix output 
depending  on  the selector  switch  below the  Phones 
Level control. If any  PFL or AFL switch is  pressed  the 
meters will show that signal level. Basically, the meters 
show the headphones  monitor  signal pre  the  head-
phones level control. 
The PFL/AFL active  LED illuminates if any PFL or AFL 
switch is pressed. 
Note that PFL and AFL monitoring will be in mono. 
2 
3 
PHONES
MIN MAX
TB MIC
L
+16
-6
-9
-20
-30
-16
-12
-3
0
+3
+6
+9
R
+16
-6
-9
-20
-30
-16
-12
-3
0
+3
+6
+9
PFL/AFL ACTIVE
Talk to LRM
Talk to AUX 1-4
POWER
LEVEL
TB
2 
Talkback 
A microphone xlr connector is provided with phantom 
power applied as a factory default. 
The  TB  Level  control  varies  the  gain  of  the  talkback 
amplifier from 20dB (MIN) to 55dB (MAX). 
The two switches send the  talkback signal to Auxes 1 
to 4 and to the main L, R & M mixes. When not using 
talkback, it is best to leave these switches in their out 
position. 
3 
Headphone Jack Sockets 
Standard 1/4 inch and 3.5mm TRS jack sockets for ste-
reo headphones. Tip = Left. 










