User Guide

Allen & Heath 20 ZED-14, 18 & 24 User Guide
MASTER SECTION
Aux output jack sockets
Standard 1/4” jack sockets for Aux 1 to 4 outputs. Impedance bal-
anced, nominal level = 0dBu.
Mix L R Insert jack sockets
Standard 1/4” (6.25mm) Jack sockets for unbalanced insert send and
return signals. Wired Tip = send, Ring = return, Sleeve = Chassis.
Nominal level is 0dBu.
Main L R output xlr sockets
Main left & right outputs. Impedance balanced signals, pin1 = chassis,
pin2 = hot (+), pin3 = cold (-). Nominal level = 0dBu.
Mono output jack socket
A mono sum of the main left & right post-fade signals.
Headphones jack sockets
One 1/4” and one 3.5mm jack socket for stereo headphones. Wired
Tip = left, Ring = right, Sleeve = Chassis.
It is recommended that headphones with an impedance higher than
30ohms are used.
48v Phantom Power switch
Press this in to switch 48v Phantom Power to all the Mic input xlr
connectors, if any of the microphones attached require power. Dy-
namic microphones won’t mind being connected to a phantom
powered input, but care is needed to ensure that 48v is not
switched on if an xlr is used to input a signal from an electronic
circuit (ie. Another mixer or keyboard).
When switching 48v on or off, or plugging in connectors to
channels with 48v present, it is important (and normal
practise) to mute the channels. This will avoid loud clicks
and bangs potentially getting through to the amps & speak-
ers with the possible effect of damaging the speakers, or
your audience’s hearing!
Left Right meters
12 segment LED meters, peak type response, the “0” position re-
flects 0dBu at the outputs. These display the signals from the moni-
tor selector switches below, or the PFL (pre-fade listen) signals
from any selected channels, which overrides.
!
OO
30
OO 10
-30
-20
-5
0
5
-10
ST
RTN
To LR
To 7-8
OO 10
-30
-20
-5
0
5
-10
2TRK
RTN
OO 10
-30
-20
-5
0
5
-10
USB
RTN
-30
-20
-5
5
0
OO
-10
10
IN
-15 +15
12kHz
HF
-15 +15
80Hz
LF
OO +6
AUX1
PRE
OO +6
AUX2
PRE
OO +6
AUX3
OO +6
AUX4
POST
L R
BAL
=
PK !
PFL
STEREO
MUTE
PK !
PFL
L
+16
-6
-9
-20
-30
-16
-12
-3
0
+3
+6
+9
R
PFL ACTIVE
MIN MAX
PHONES
AUX1
AUX2
2TRK RTN
USB RTN
STEREO
OO +6
ALT
OUT
MONITOR
LR
OO +6
AUX1
MASTER
OO +6
AUX2
MASTER
5
20
10
5
0
10
ON
To LR
To 9-10
ON
To LR
To 11-12
ON
ST3
USB
AUX1-2
AUX 3-4
LR PRE
UP=LR post
SENDRETURN
L R
BAL
=
MUTE
-30
-20
-5
5
0
OO
-10
10
IN
-15 +15
12kHz
HF
-15 +15
80Hz
LF
OO +6
AUX1
PRE
OO +6
AUX2
PRE
OO +6
AUX3
OO +6
AUX4
POST
L R
BAL
=
PK !
PFL
STEREO
ST2
MUTE
-30
-20
-5
5
0
OO
-10
10
IN
-15 +15
12kHz
HF
-15 +15
80Hz
LF
OO +6
AUX1
PRE
OO +6
AUX2
PRE
OO +6
AUX3
OO +6
AUX4
POST
L R
BAL
=
PK !
PFL
STEREO
ST1
MUTE
OO
30
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10
20
30
40
50
100Hz
12kHz
-15 +15
HF
120Hz 4k
200
2k
650
-15
HM
+15
-15 +15
80Hz
LF
5
10
20
5
0
10
OO +6
AUX1
PRE
OO +6
AUX2
PRE
OO +6
AUX3
OO +6
AUX4
POST
L R
PAN
=
PK !
PFL
MUTE
POST
PRE
LR
-30
-20
-5
5
0
OO
-10
10
IN
-15 +15
12kHz
HF
-15 +15
80Hz
LF
OO +6
AUX1
PRE
OO +6
AUX2
PRE
OO +6
AUX3
OO +6
AUX4
POST
STEREO
ST4
ST2 IN
L/M
R
ST3 IN
L/M
R
L/M
R
L
R
POWER
48V
INSERT R
AUX1 OUT
PHONES
MAIN OUT
INSERT
6
ST RTN
L
R
2TRK RTN
L
R
REC OUT
L
R
ALT OUT
L
R
INSERT
5
INSERT
4
INSERT
3
INSERT
2
INSERT
1
100Hz
12kHz
-15 +15
HF
-15
HM
+15
OO +6
AUX1
PRE
OO +6
AUX2
PRE
OO +6
AUX3
OO +6
AUX4
POST
L R
PAN
=
PK !
PFL
MUTE
100Hz
12kHz
-15 +15
HF
-15
HM
+15
OO +6
AUX1
PRE
OO +6
AUX2
PRE
OO +6
AUX3
OO +6
AUX4
POST
L R
PAN
=
PK !
PFL
MUTE
100Hz
12kHz
-15 +15
HF
-15
HM
+15
OO +6
AUX1
PRE
OO +6
AUX2
PRE
OO +6
AUX3
OO +6
AUX4
POST
L R
PAN
=
PK !
PFL
MUTE
100Hz
12kHz
-15 +15
HF
-15
HM
+15
OO +6
AUX1
PRE
OO +6
AUX2
PRE
OO +6
AUX3
OO +6
AUX4
POST
L R
PAN
=
PK !
PFL
MUTE
100Hz
12kHz
-15 +15
HF
-15
HM
+15
OO +6
AUX1
PRE
OO +6
AUX2
PRE
OO +6
AUX3
OO +6
AUX4
POST
L R
PAN
=
PK !
PFL
MUTE
1 2 3 4 5 6 7-8 9-10 11-12 13-14 RL
0
0
0
PHANTOM POWER
ALLEN
HEATH
LINE LINE LINE LINE LINE LINE
MIC MIC MIC MIC MIC MIC
ST4 INST1 IN
L/M
R
AUX2 OUT
AUX3 OUT
AUX4 OUT
INSERT L
MONO OUT
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10
20
30
40
50
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10
20
30
40
50
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10
20
30
40
50
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10
20
30
40
50
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10
20
30
40
50
-15 +15
80Hz
LF
-15 +15
80Hz
LF
-15 +15
80Hz
LF
-15 +15
80Hz
LF
-15 +15
80Hz
LF
500
1k
3k
120Hz 4k
200
2k
650
500
1k
3k
120Hz 4k
200
2k
650
500
1k
3k
120Hz 4k
200
2k
650
500
1k
3k
120Hz 4k
200
2k
650
500
1k
3k
120Hz 4k
200
2k
650
500
1k
3k
POST POST POST POST POST POST POST POST POST POST
OO
30
5
10
20
5
0
10
OO
30
5
10
20
5
0
10
OO
30
5
10
20
5
0
10
OO
30
5
10
20
5
0
10
OO
30
5
10
20
5
0
10
OO
30
5
10
20
5
0
10
OO
30
5
10
20
5
0
10
OO
30
5
10
20
5
0
10
OO
30
5
10
20
5
0
10
+16
-6
-9
-20
-30
-16
-12
-3
0
+3
+6
+9
&