ALLEN & HEATH ZED 420 User manual

USER GUIDE
Publication AP7028 Issue 2

Allen & Heath 2 ZED-4 BUS User Guide

Allen & Heath 3 ZED-4 BUS User Guide
ZED products comply with the European Electromagnetic Compatibility directive 2014/30/EU and the Eu-
ropean Low Voltage directive 2014/35/EU.
Any changes or modifications to the product not approved by Allen & Heath could void the compliance of the
product and therefore the user’s authority to operate it.
ALLEN&HEATH
Limited One Year Manufacturer’s Warranty
Allen & Heath warrants the Allen &Heath -branded hardware product and accessories contained in the original
packaging ("Allen & Heath Product”) against defects in materials and workmanship when used in accordance with
Allen & Heath's user manuals, technical specifications and other Allen & Heath product published guidelines for a
period of ONE (1) YEAR from the date of original purchase by the end-user purchaser ("Warranty Period").
This warranty does not apply to any non-Allen & Heath branded hardware products or any software, even if pack-
aged or sold with Allen & Heath hardware.
Please refer to the licensing agreement accompanying the software for details of your rights with respect to the use
of software/firmware (“EULA”).
Details of the EULA, warranty policy and other useful information can be found on the Allen & Heath website:
www.allen-heath.com/legal.
Repair or replacement under the terms of the warranty does not provide right to extension or renewal of the warran-
ty period. Repair or direct replacement of the product under the terms of this warranty may be fulfilled with func-
tionally equivalent service exchange units.
This warranty is not transferable. This warranty will be the purchaser’s sole and exclusive remedy and neither Al-
len & Heath nor its approved service centres shall be liable for any incidental or consequential damages or breach
of any express or implied warranty of this product.
Conditions Of Warranty
The equipment has not been subject to misuse either intended or accidental, neglect, or alteration other than as de-
scribed in the User Guide or Service Manual, or approved by Allen & Heath. The warranty does not cover fader
wear and tear.
Any necessary adjustment, alteration or repair has been carried out by an authorised Allen & Heath distributor or
agent.
The defective unit is to be returned carriage prepaid to the place of purchase, an authorised Allen & Heath distribu-
tor or agent with proof of purchase. Please discuss this with the distributor or the agent before shipping. Units re-
turned should be packed in the original carton to avoid transit damage.
DISCLAIMER: Allen & Heath shall not be liable for the loss of any saved/stored data in products that are either
repaired or replaced.
Check with your Allen & Heath distributor or agent for any additional warranty information which may apply. If
further assistance is required please contact Allen & Heath Ltd.
Register your product online at www.allen-heath.com/register.
Copyright © 2016 Allen & Heath. All rights reserved.

Allen & Heath 4 ZED-4 BUS User Guide
PACKED ITEMS
Check that you have received the following:
Mains Lead
Check that the correct
mains plug is fitted.
ZED-420, ZED428 or ZED-436 MIXER
Type A-B USB Lead
To connect the ZED to
your computer.
MIC
INSERT
LINE
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
1
DIROUT
48V
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
2
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
3
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
4
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
5
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
6
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
7
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
8
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
9
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
10
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
11
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
12
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
13
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
14
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
15
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
16
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
25-26
-15 +15
HF
12k
-15
HM
+15
2k5
-15
LM
+15
250Hz
-15
LF
+15
80Hz
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
EQIN
10
-30
-20
-5
0
5
-10
ST1
LEV
OO
10
-30
-20
-5
0
5
-10
OO
ToLR
ToCH
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
PRE
POST
OO
OO
OO
OO
+6
AUX5
POST
+6
AUX6
POST
OO
OO
ODD
BAL
L
EVEN
R
=
MUTE
PFL
PK!
SIG
10
OO
30
20
ST1 IN
R
ST2
L/M
R
10
-30
-20
-5
0
5
-10
ST3
LEV
OO
ToLR
ToCH
PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL
ST3
L
R
ST4
L/M
R
STEREOINPUTS
ST2
LEV
IN
IN IN
-15 +15
HF
12k
-15
HM
+15
2k5
-15
LM
+15
250Hz
-15
LF
+15
80Hz
EQIN
10
-30
-20
-5
0
5
-10
OO
ST4
LEV
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
PRE
POST
OO
OO
OO
OO
+6
AUX5
POST
+6
AUX6
POST
OO
OO
ODD
BAL
L
EVEN
R
=
MUTE
PFL
PK!
SIG
0
10
OO
30
20
27-28
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
17
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
OO
R
OO
L
OO
+6
+6
+6
2
3
GRP
4
OO
GRP
OO
1
GRP
OO
GRP
+6
+6
+6
1
OO
M
+6
MIC
INSERT
LINE
DIROUT
48V
17
17
17
17
OO
R
OO
L
OO
+6
+6
+6
2
3
GRP
4
OO
GRP
OO
1
GRP
OO
GRP
+6
+6
+6
OO
M
+6
OO
LEVEL
+6
AFL
OO
LEVEL
+6
AFL
AUX 1AUX 2AUX 3AUX 4AUX 5AUX 6
GRP 1GRP2GRP 3GRP4
INSERT1INSERT 2INSERT3INSERT 4
USB
SENDRETURN
AUXOUT
GROUPOUT
MTX1MTX 2
MATRIX
OUT
L
L
R
L
R
2TRK IN
2TRK OUT
INSERTL
INSERTR
INSERTM
L
R
MAINOUT
M
PHONES
MIN MAX
TB MIC
MIN MAX
M
LR
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/AFLACTIVE
Talkto LRM
Talkto AUX1-4
POWER
MTX
1-2
AUX
1-2
AUX
5-6
LR
pre-fade
Allup= LRpost
OO +6
PLAYBACK
ToLR
ALLEN&HEATH
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
L-R
M
PAN
L R
=
PAN
L R
=
PAN
L R
=
PAN
L R
=
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
MUTE
AFL
MUTE
AFL
MUTE
AFL
MUTE
AFL
MUTE MUTE MUTE
AUX1
AFL
AUX2
AFL
AUX3
AFL
AUX4
AFL
AUX5
AFL
AUX6
AFL
GRP L R M
L-R
M
L-R
M
L-R
M
0
0
1 2 3 4
USB
2TRK
PLAYBACKSOURCE
LEVEL
PLAYBACK
LEVEL
TB
LEVEL
PHONES
PFL
USBSEND SOURCE
ST3INPUTSOURCE
USB
ST3IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
18
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
18
18
18
18
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
19
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
19
19
19
19
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
20
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
20
20
20
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
21
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
21
21
21
21
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
22
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
22
22
22
22
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
23
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
23
23
23
23
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
24
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
24
24
24
24
IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN
L R M
MATRIX 2MATRIX
1GRP2GRP3GRP4
M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
M
L-R
1-2
3-4
M
L-R
1-2
3-4
OO +10
0
OO +10
0
OO +10
0
OO +10
0
OO +10
0
OO +10
0
PFL

Allen & Heath 5 ZED-4 BUS User Guide
SAFETY INSTRUCTIONS
WARNINGS - Read the following before proceeding :
WARNING- THISAPPARATUSMUSTBEEARTHED.
CAUTION- HOTSURFACE, AVOIDCONTACT.
CAUTION
Madein theUKb ALLEN& HEATH
SERIAL No:
T3.15A 20mm 220 - 240V~
T5.0A 20mm 100 - 120V~
FUSETYPE ACSUPPLY 47-63H
320VAMAX
300WMAX
ACMAINSIN~
ATTENTION: RISQUE DE CHOC ELECTRIQUE – NE PAS OUVRIR
Read instructions: Retain these safety and operating instructions for future reference. Adhere to all warnings printed
here and on the console. Follow the operating instructions printed in this User Guide.
Do not remove cover: Operate the console with its covers correctly fitted.
Power sources: Connect the console to a mains power unit only of the type described in this User Guide and marked
on the rear panel. Use the power cord with sealed mains plug appropriate for your local mains sup-
ply as provided with the console. If the provided plug does not fit into your outlet consult your service
agent for assistance.
Power cord routing: Route the power cord so that it is not likely to be walked on, stretched or pinched by items placed
upon or against it.
Grounding: Do not defeat the grounding and polarisation means of the power cord plug. Do not remove or tam-
per with the ground connection in the power cord.
Water and moisture: To reduce the risk of fire or electric shock do not expose the console to rain or moisture or use it in
damp or wet conditions. Do not place containers of liquids on it which might spill into any openings.
Ventilation: Do not obstruct the ventilation slots or position the console where the air flow required for ventilation
is impeded. If the console is to be operated in a rack unit or flightcase ensure that it is constructed to
allow adequate ventilation.
Heat and vibration: Do not locate the console in a place subject to excessive heat or direct sunlight as this could be a fire
hazard. Locate the console away from any equipment which produces heat or causes excessive vi-
bration.
Servicing: Switch off the equipment and unplug the power cord immediately if it is exposed to moisture, spilled
liquid, objects fallen into the openings, the power cord or plug become damaged, during lightening
storms, or if smoke, odour or noise is noticed. Refer servicing to qualified technical personnel only.
Installation: Install the console in accordance with the instructions printed in this User Guide. Do not connect the
output of power amplifiers directly to the console. Use audio connectors and plugs only for their
intended purpose.
!WARNING: This equipment must be earthed.

Allen & Heath 6 ZED-4 BUS User Guide
SAFETY INSTRUCTIONS
TERMINAL WIRE COLOUR
European USA/Canada
LLIVE BROWN BLACK
NNEUTRAL BLUE WHITE
EEARTH GND GREEN & YELLOW GREEN
Important Mains plug wiring instructions
The console is supplied with a moulded mains plug fitted to the AC
mains power lead. Follow the instructions below if the mains plug has to
be replaced. The wires in the mains lead are coloured in accordance
with the following code:
!
The wire which is coloured Green and Yellow must be connected to the
terminal in the plug which is marked with the letter E or with the Earth sym-
bol. This appliance must be earthed.
The wire which is coloured Blue must be connected to the terminal in the
plug which is marked with the letter N.
The wire which is coloured Brown must be connected to the terminal in the
plug which is marked with the letter L.
Ensure that these colour codes are followed carefully in the event of the
plug being changed.

!
General Precautions:
Damage : To prevent damage to the controls and cosmetics avoid placing heavy
objects on the control surface, scratching the surface with sharp objects, or
rough handling and vibration.
Environment : Protect from excessive dirt, dust, heat and vibration when operating
and storing. Avoid tobacco ash, smoke, drinks spillage, and exposure to rain
and moisture. If the console becomes wet, switch off and remove mains pow-
er immediately. Allow to dry out thoroughly before using again.
Cleaning : Avoid the use of chemicals, abrasives or solvents. The control panel is
best cleaned with a soft brush and dry lint-free cloth. The faders, switches and
potentiometers are lubricated for life. The use of electrical lubricants on these
parts is not recommended. The fader and potentiometer knobs may be re-
moved for cleaning with a warm soapy solution. Rinse and allow to dry fully
before refitting them.
Transporting : The console may be transported as a free-standing unit or mounted in
a rack or flightcase. Protect the controls from damage during transit. Use
adequate packing if you need to ship the unit.
Hearing : To avoid damage to your hearing do not operate any sound system at exces-
sively high volume. This applies particularly to close-to-ear monitoring such as
headphones and in-ear systems. Continued exposure to high volume sound
can cause frequency selective or wide range hearing loss.

Allen & Heath 7 ZED-4 BUS User Guide
CONTENTS
Thank you for purchasing your Allen & Heath ZED mixer. To ensure that
you get the maximum benefit from the unit please spare a few minutes
familiarizing yourself with the controls and setup procedures outlined in
this user guide. For further information please refer to the additional
information available on our web site, or contact our technical support
team.
http://www.allen-heath.com
http://www.allen-heath.com/zed
http://www.myspace.com/thezedspace
Warranty............................................. 3
Packed Items....................................... 4
Safety Instructions............................. 5
Contents ............................................. 7
Panel Drawings................................... 8
Introduction to ZED......................... 11
Specifications...................................... 12
Dimensions......................................... 13
Block Diagram.................................... 14
Mono Input Channel......................... 15
Stereo Input Channel........................ 19
Matrix Outputs & Aux Masters ...... 22
Group Masters................................... 23
L R & M Masters & Headphones.... 24
Main Meters and Talkback................ 25
USB Selection and Playback............. 26
USB Connection................................ 27
Using USB for effects........................ 28
Wiring Notes ..................................... 29

Allen & Heath 8 ZED-4 BUS User Guide
PANEL DRAWINGS—ZED420
MIC
INSERT
LINE
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
1
DIROUT
48V
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
HF
EQ IN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
2
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
3
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
4
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
5
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
6
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
7
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
8
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
9
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
10
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
11
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
12
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
13
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
14
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
15
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
16
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQ IN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
17-18
-15 + 15
HF
12k
-15
HM
+ 15
2k5
-15
LM
+ 15
250Hz
-15
LF
+ 15
80Hz
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
EQ IN
10
-30
-20
-5
0
5
-10
ST1
LEV
OO
10
-30
-20
-5
0
5
-10
OO
ToLR
ToCH
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
PRE
POST
OO
OO
OO
OO
+6
AUX5
POST
+6
AUX6
POST
OO
OO
ODD
BAL
L
EVEN
R
=
MUTE
PFL
PK!
SIG
10
OO
30
20
ST1 IN
R
ST2
L/M
R
10
-30
-20
-5
0
5
-10
ST3
LEV
OO
ToLR
ToCH
PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL
ST3
L
R
ST4
L/M
R
STEREOINPUTS
ST2
LEV
IN
IN IN
-15 + 15
HF
12k
-15
HM
+ 15
2k5
-15
LM
+ 15
250Hz
-15
LF
+ 15
80Hz
EQ IN
10
-30
-20
-5
0
5
-10
OO
ST4
LEV
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
PRE
POST
OO
OO
OO
OO
+6
AUX5
POST
+6
AUX6
POST
OO
OO
ODD
BAL
L
EVEN
R
=
MUTE
PFL
PK!
SIG
0
10
OO
30
20
19-20
OO
R
OO
L
OO
+6
+6
+6
2
3
GRP
4
OO
GRP
OO
1
GRP
OO
GRP
+6
+6
+6
1
OO
M
+6
OO
R
OO
L
OO
+6
+6
+6
2
3
GRP
4
OO
GRP
OO
1
GRP
OO
GRP
+6
+6
+6
OO
M
+6
OO
LEVEL
+6
AFL
OO
LEVEL
+6
AFL
AUX 1AUX 2AUX 3AUX 4AUX 5AUX 6
GRP 1GRP 2GRP3GRP 4
INSERT 1INSERT 2INSERT 3INSERT 4
USB
SENDRETURN
AUXOUT
GROUPOUT
MTX 1MTX 2
MATRIX
OUT
L
L
R
L
R
2TRKIN
2TRKOUT
INSERT L
INSERT R
INSERT M
L
R
MAIN OUT
M
PHONES
MIN MAX
TB MIC
MIN MAX
M
LR
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/AFLACTIVE
Talk to LRM
Talk to AUX1-4
POWER
MTX
1-2
AUX
1-2
AUX
5-6
LR
pre-fade
All up = LRpost
OO +6
PLAYBACK
ToLR
ALLEN&HEATH
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
L-R
M
PAN
L R
=
PAN
L R
=
PAN
L R
=
PAN
L R
=
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
MUTE
AFL
MUTE
AFL
MUTE
AFL
MUTE
AFL
MUTE MUTE MUTE
AUX1
AFL
AUX2
AFL
AUX3
AFL
AUX4
AFL
AUX5
AFL
AUX6
AFL
GRP L R M
L-R
M
L-R
M
L-R
M
0
0
1 2 3 4
USB
2TRK
PLAYBACKSOURCE
LEVEL
PLAYBACK
LEVEL
TB
LEVEL
PHONES
PFL
USBSEND SOURCE
ST3 INPUTSOURCE
USB
ST3 IN
IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN
L R M
MATRIX 2MATRIX
1GRP2GRP3GRP4
M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
M
L-R
1-2
3-4
M
L-R
1-2
3-4
OO + 10
0
OO + 10
0
OO + 10
0
OO + 10
0
OO + 10
0
OO + 10
0
ACMAINSIN~
100- 240V~ 47-63Hz 60WMAX
REFER SERVICINGTOQUALIFIEDSERVICEPERSONNEL.
REPLACEFUSEWITH SAMETYPEAND RATING.
CAUTION: FORCONTINUEDPROTECTIONAGAINSTRISK OFFIRE
ATTENTION: REMPLACERPAR UNFUSIBLESTRICTEMENTIDENTIQUEEN VALEURS.
DONOTOPEN
CAUTION
RISKOFELECTRICSHOCK
AVIS:RISQUE DECHOCELECTRIQUE - NEPAS OUVRIR.
WARNING: TOREDUCETHERISK OFELECTRICSHOCK DONOT EXPOSETHIS APPARATUS TORAINORMOISTURE.
ALLEN&HEATH
OFF
0I
ON
WARNING: THISAPPARATUS MUSTBEEARTHED
Serial No.
ENGINEEREDINENGLANDBYALLEN& HEATH LIMITED.
(2) thisdevicemustaccept anyinterferencereceived,
This devicecomplieswithPart15 oftheFCC Rules.
(1) thisdevicemay notcauseharmful interference, and
Operationis subjectto thefollowing two conditions:
includinginterference thatmay causeundesiredoperation.
T1.6AL 250V20mm
FUSE
PFL

Allen & Heath 9 ZED-4 BUS User Guide
PANEL DRAWINGS—ZED428
MIC
INSERT
LINE
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
1
DIROUT
48V
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
2
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
3
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
4
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
5
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
6
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
7
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
8
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
9
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
10
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
11
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
12
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
13
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
14
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
15
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
16
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
25-26
-15 + 15
HF
12k
-15
HM
+ 15
2k5
-15
LM
+ 15
250Hz
-15
LF
+ 15
80Hz
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
EQIN
10
-30
-20
-5
0
5
-10
ST1
LEV
OO
10
-30
-20
-5
0
5
-10
OO
ToLR
ToCH
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
PRE
POST
OO
OO
OO
OO
+6
AUX5
POST
+6
AUX6
POST
OO
OO
ODD
BAL
L
EVEN
R
=
MUTE
PFL
PK!
SIG
10
OO
30
20
ST1 IN
R
ST2
L/M
R
10
-30
-20
-5
0
5
-10
ST3
LEV
OO
ToLR
ToCH
PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL
ST3
L
R
ST4
L/M
R
STEREOINPUTS
ST2
LEV
IN
IN IN
-15 + 15
HF
12k
-15
HM
+ 15
2k5
-15
LM
+ 15
250Hz
-15
LF
+ 15
80Hz
EQIN
10
-30
-20
-5
0
5
-10
OO
ST4
LEV
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
PRE
POST
OO
OO
OO
OO
+6
AUX5
POST
+6
AUX6
POST
OO
OO
ODD
BAL
L
EVEN
R
=
MUTE
PFL
PK!
SIG
0
10
OO
30
20
27-28
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
17
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
OO
R
OO
L
OO
+6
+6
+6
2
3
GRP
4
OO
GRP
OO
1
GRP
OO
GRP
+6
+6
+6
1
OO
M
+6
MIC
INSERT
LINE
DIROUT
48V
17
17
17
17
OO
R
OO
L
OO
+6
+6
+6
2
3
GRP
4
OO
GRP
OO
1
GRP
OO
GRP
+6
+6
+6
OO
M
+6
OO
LEVEL
+6
AFL
OO
LEVEL
+6
AFL
AUX 1AUX2AUX3AUX4AUX5AUX6
GRP1GRP 2GRP 3GRP 4
INSERT 1INSERT 2INSERT 3INSERT4
USB
SENDRETURN
AUX OUT
GROUP OUT
MTX1MTX2
MATRIX
OUT
L
L
R
L
R
2TRKIN
2TRKOUT
INSERT L
INSERT R
INSERT M
L
R
MAINOUT
M
PHONES
MIN MAX
TB MIC
MIN MAX
M
LR
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/AFLACTIVE
Talk to LRM
Talkto AUX1-4
POWER
MTX
1-2
AUX
1-2
AUX
5-6
LR
pre-fade
Allup = LRpost
OO +6
PLAYBACK
ToLR
ALLEN&HEATH
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
L-R
M
PAN
L R
=
PAN
L R
=
PAN
L R
=
PAN
L R
=
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
MUTE
AFL
MUTE
AFL
MUTE
AFL
MUTE
AFL
MUTE MUTE MUTE
AUX1
AFL
AUX2
AFL
AUX3
AFL
AUX4
AFL
AUX5
AFL
AUX6
AFL
GRP L R M
L-R
M
L-R
M
L-R
M
0
0
1 2 3 4
USB
2TRK
PLAYBACKSOURCE
LEVEL
PLAYBACK
LEVEL
TB
LEVEL
PHONES
PFL
USB SEND SOURCE
ST3 INPUT SOURCE
USB
ST3 IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
18
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
18
18
18
18
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
19
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
19
19
19
19
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
20
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
20
20
20
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
21
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
21
21
21
21
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
22
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
22
22
22
22
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
23
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
23
23
23
23
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
24
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
24
24
24
24
IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN
L R M
MATRIX 2MATRIX
1GRP2GRP3GRP 4
M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
M
L-R
1-2
3-4
M
L-R
1-2
3-4
OO + 10
0
OO + 10
0
OO + 10
0
OO + 10
0
OO + 10
0
OO + 10
0
ACMAINSIN~
100- 240V~ 47-63Hz60WMAX
REFERSERVICINGTOQUALIFIEDSERVICEPERSONNEL.
REPLACEFUSE WITHSAME TYPEANDRATING.CAUTION: FOR CONTINUEDPROTECTIONAGAINSTRISKOFFIRE
ATTENTION:REMPLACERPARUNFUSIBLESTRICTEMENTIDENTIQUEENVALEURS.
DONOT OPEN
CAUTION
RISK OFELECTRICSHOCK
AVIS:RISQUE DECHOC ELECTRIQUE- NEPAS OUVRIR.
WARNING: TOREDUCETHE RISKOFELECTRICSHOCK DONOTEXPOSE THISAPPARATUSTORAINORMOISTURE.
ALLEN&HEATH
OFF
0 I
ON
WARNING: THISAPPARATUSMUST BEEARTHED
SerialNo.
ENGINEEREDINENGLAND BYALLEN & HEATHLIMITED.
(2)thisdevicemustaccept anyinterferencereceived,
ThisdevicecomplieswithPart15of theFCCRules.
(1)thisdevicemaynotcauseharmfulinterference,and
Operationis subjectto the followingtwoconditions:
includinginterference thatmaycauseundesiredoperation.
T1.6A L 250V20mm
FUSE
PFL

Allen & Heath 10 ZED-4 BUS User Guide
PANEL DRAWINGS—ZED436
ACMAINSIN~
100- 240V~ 47-63Hz 60WMAX
REFERSERVICINGTOQUALIFIEDSERVICEPERSONNEL.
REPLACEFUSEWITHSAME TYPEANDRATING.CAUTION: FORCONTINUEDPROTECTIONAGAINSTRISKOFFIRE
ATTENTION: REMPLACERPARUNFUSIBLESTRICTEMENT IDENTIQUEENVALEURS.
DONOT OPEN
CAUTION
RISKOFELECTRICSHOCK
AVIS:RISQUEDECHOCELECTRIQUE-NEPASOUVRIR.
WARNING: TOREDUCETHERISKOFELECTRICSHOCK DONOTEXPOSETHISAPPARATUSTORAINORMOISTURE.
ALLEN&HEATH
OFF
0 I
ON
WARNING: THISAPPARATUS MUST BEEARTHED
SerialNo.
ENGINEEREDINENGLANDBYALLEN& HEATHLIMITED.
(2)this devicemustacceptanyinterferencereceived,
ThisdevicecomplieswithPart15of theFCC Rules.
(1)this devicemaynotcauseharmful interference,and
Operationissubjectto thefollowingtwoconditions:
includinginterferencethatmaycauseundesired operation.
T1.6AL250V20mm
FUSE
MIC
INSERT
LINE
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
1
DIROUT
48V
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
2
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
3
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
4
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
5
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
6
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
7
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
8
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
9
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
10
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
11
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
12
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
13
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
14
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
15
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
16
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
33-34
-15 + 15
HF
12k
-15
HM
+15
2k5
-15
LM
+15
250Hz
-15
LF
+15
80Hz
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
EQIN
10
-30
-20
-5
0
5
-10
ST1
LEV
OO
10
-30
-20
-5
0
5
-10
OO
ToLR
ToCH
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
PRE
POST
OO
OO
OO
OO
+6
AUX5
POST
+6
AUX6
POST
OO
OO
ODD
BAL
L
EVEN
R
=
MUTE
PFL
PK!
SIG
10
OO
30
20
ST1 IN
R
ST2
L/M
R
10
-30
-20
-5
0
5
-10
ST3
LEV
OO
ToLR
ToCH
PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL
ST3
L
R
ST4
L/M
R
STEREO INPUTS
ST2
LEV
IN
IN IN
-15 + 15
HF
12k
-15
HM
+15
2k5
-15
LM
+15
250Hz
-15
LF
+15
80Hz
EQIN
10
-30
-20
-5
0
5
-10
OO
ST4
LEV
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
PRE
POST
OO
OO
OO
OO
+6
AUX5
POST
+6
AUX6
POST
OO
OO
ODD
BAL
L
EVEN
R
=
MUTE
PFL
PK!
SIG
0
10
OO
30
20
35-36
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
17
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
OO
R
OO
L
OO
+6
+6
+6
2
3
GRP
4
OO
GRP
OO
1
GRP
OO
GRP
+6
+6
+6
1
OO
M
+6
MIC
INSERT
LINE
DIROUT
48V
17
17
17
17
OO
R
OO
L
OO
+6
+6
+6
2
3
GRP
4
OO
GRP
OO
1
GRP
OO
GRP
+6
+6
+6
OO
M
+6
OO
LEVEL
+6
AFL
OO
LEVEL
+6
AFL
AUX 1AUX2AUX3AUX4AUX5AUX6
GRP 1GRP 2GRP 3GRP4
INSERT 1INSERT2INSERT 3INSERT 4
USB
SENDRETURN
AUXOUT
GROUPOUT
MTX1MTX2
MATRIX
OUT
L
L
R
L
R
2TRK IN
2TRK OUT
INSERT L
INSERT R
INSERT M
L
R
MAINOUT
M
PHONES
MIN MAX
TB MIC
MIN MAX
M
LR
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/AFLACTIVE
Talkto LRM
Talkto AUX1-4
POWER
MTX
1-2
AUX
1-2
AUX
5-6
LR
pre-fade
Allup = LRpost
OO +6
PLAYBACK
ToLR
ALLEN&HEATH
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
L-R
M
PAN
L R
=
PAN
L R
=
PAN
L R
=
PAN
L R
=
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
MUTE
AFL
MUTE
AFL
MUTE
AFL
MUTE
AFL
MUTE MUTE MUTE
AFL AFL AFL AFL AFL AFL
GRP L R M
L-R
M
L-R
M
L-R
M
0
0
1 2 3 4
USB
2TRK
PLAYBACKSOURCE
LEVEL
PLAYBACK
LEVEL
TB
LEVEL
PHONES
PFL
USB SEND SOURCE
ST3 INPUT SOURCE
USB
ST3 IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
18
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
18
18
18
18
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
19
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
19
19
19
19
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
20
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
20
20
20
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
21
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
21
21
21
21
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
22
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
22
22
22
22
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
23
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
23
23
23
23
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
24
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
24
24
24
24
IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN
L R M
MATRIX 2MATRIX
1GRP2GRP3GRP4
M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
M
L-R
1-2
3-4
M
L-R
1-2
3-4
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
25
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
25
25
25
25
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
26
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
26
26
26
26
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
27
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
27
27
27
27
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
28
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
28
28
28
28
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
29
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
29
29
29
29
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
30
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
30
30
30
30
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
31
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
31
31
31
31
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
32
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
32
32
32
32
IN
AUX1 AUX2 AUX3 AUX4 AUX5 AUX6
OO + 10
0
OO +10
0
OO + 10
0
OO +10
0
OO + 10
0
OO + 10
0
PFL

Allen & Heath 11 ZED-4 BUS User Guide
INTRODUCTION TO THE ZED-4 BUS MIXERS
A Technical Overview:
The Allen & Heath ZED-4 mixer has been carefully and lovingly designed in the beautiful county of Cornwall in the UK and is
manufactured alongside a wide range of professional audio mixing consoles. Many of the components used in ZED are exactly
the same as in the larger Allen & Heath products and the construction methods are also very similar —utilising individual ver-
tically mounted channel circuit boards with each rotary control fixed with a metal nut to the front panel. This provides a very
robust product that will resist damage and give years of reliable use. It also makes servicing much easier should it be required,
with the ability to remove one particular channel from the mixer at a time, or easily change a fader.
The audio circuitry is based on years of continual development and refinement, the performance of all the elements within the
mixer scrutinised and perfected to ensure the very best sound quality possible.
Mic/Line Pre-amps:
Based on the pre-amps from the PA series, the ZED series pre-amps use a two stage design, with carefully controlled amounts
of gain in each stage. When amplifying the signal from the XLR input, the gain range is huge —69dB of range to be exact —
and is very evenly distributed around the gain control, meaning better control of signal level. Most of the gain comes from the
first stage, so unwanted noise is kept to a minimum. There is no “pad” switch, or pad circuit — line level signals are simply
plugged into the second stage of the pre-amp by using the line input jack socket. This has the great advantage of lower noise
when using the line input. (It is common to attenuate line level signals, the amplify them back up again which can give more
noise or hiss).
EQ:
The ZED-4 series mixers are equipped with a 4-band equaliser circuit on each input, based closely on the acclaimed GL2400
EQ. The frequency and response of each has been carefully chosen to give the maximum performance when using the EQ on a
variety of sources.
AUX system:
Six auxiliary sends are provided, two pre-fade, two post fade, and two switched pre or post fade. The Aux master level con-
trols are grouped nicely together in the master section and have AFL (after fade listen) switches for monitoring.
Groups:
The four sub-groups can be used for easy control of groups of inputs, or for applying signal processing such as compression to
groups of signals using the Group Insert connector. The groups have individual outputs and can also be sub-mixed to the main
L-R and Mono mixes.
Main Mix:
In addition to the main L-R stereo bus, there is a Mono bus which can be routed to individually, ideal for feeding low frequency
speaker systems, or creating a mono PA mix.
Mono and Stereo Channels:
The ZED-420, 428 and 436 models have a full complement of 16, 24 and 32 mono inputs respectively, plus two stereo chan-
nels, maximising the number of inputs you get. The Stereo channels are dual, so you can get 4 stereo inputs to mix before you
need to use any mono channels.
USB:
Getting audio to and from a computer easily is now a common requirement for live sound and music production. The way we
have implemented this on ZED is super-flexible and super-easy! No longer do you need to fiddle around the back of your PC
to get to the soundcard inputs, only to find that the levels are all wrong and noisy. Just plug in a USB lead to your ZED, select
the USB routing on the mixer and the device on your computer and that’s it! Quality audio to and from your PC or MAC.
As you can tell, we’re very proud of this product we hope you like it too!

Allen & Heath 12 ZED-4 BUS User Guide
SPECIFICATIONS
Operating Levels
Inputs
Mono channel (XLR) Input +6 to –63dBu for nominal (+17dBu in max)
Mono channel Line Input (Jack socket) +10 to –26dBu (+30dBu maximum)
Insert point (TRS Jack socket) 0dBu nominal +21dBu maximum
Stereo Input (Jack sockets) 0dBu nominal (control = Off to +10dB)
Stereo input (phono sockets) 0dBu nominal (control = Off to +10dB)
2 Track Input (phono sockets) 0dBu nominal +21dBu maximum
Outputs
L, R & Mono Outputs (XLR) +4dBu nominal. +27dBu maximum.
L, R & M Insert (TRS Jack socket) -2dBu nominal +21dBu maximum
Group Outputs (Jack sockets) +4dBu nominal. +27dBu maximum.
Group Insert (TRS Jack socket) -2dBu nominal +21dBu maximum
Aux Outputs (Jack sockets) -2dBu nominal +21dBu maximum (Bal Option +4)
Matrix Outputs (TRS Jack socket) -2dBu nominal. +21dBu maximum. (Bal Option +4)
2 Track Output (phono sockets) 0dBu nominal. +21dBu maximum.
Direct Out (TRS Jack socket) 0dBu nominal. +21dBu maximum.
Frequency Response
Mic in to Mix L/R Out, 30dB gain +0.5/-1dB 20Hz to 20kHz.
Line in to Mix L/R out 0dB gain +0.5/-1dB 10Hz to 30kHz
Stereo in to Mix L/R out +0.5/-1dB 10Hz to 30kHz
THD+n
Mic in to Mix L/R Out, 0dB gain 1kHz +10dBu out 0.004%
Mic in to Mix L/R Out, 30dB gain 1kHz 0.014%
Line in to Mix L/R out 0dB gain 0dBu 1kHz 0.005%
Stereo in to Mix L/R out 0dB gain +10dBu 1kHz 0.003%
Headroom
Analogue Headroom from nominal (0Vu) 21dB
USB in & out headroom from nominal (0Vu) 14dB
USB Audio CODEC (Coder/Decoder)
USB Audio In/Out USB 1.1 compliant 16bit.
Sample Rate 32, 44.1, or 48kHz
Noise
Mix Noise, LR out, 16 channels routed, Ref +4dBu, 22-22kHz -90dB (-86dBu)
Mix Noise, LR out, 24 channels routed, Ref +4dBu, 22-22kHz -89dB (-85dBu)
Mix Noise, LR out, 32 channels routed, Ref +4dBu, 22-22kHz -88dB (-84dBu)
Mic Pre EIN @ max gain 150R input Z 22-22kHz -127dBu

Allen & Heath 13 ZED-4 BUS User Guide
560mm
(22.1 inches)
Dimensions
Weight kg (lb)
PackedUnpacked
ZED-420 17.5 (38.5 lb)14 (31 lb)
ZED-428 18 (40 lb) 22.5 (56.25 lb)
ZED-436 22 (48.5 lb) 26.5 (58.3 lb)
MIC
INSERT
LINE
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
1
DIROUT
48V
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
2
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
3
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
4
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
5
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
6
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
7
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
8
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
9
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
10
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
11
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
12
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
13
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
14
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
15
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
16
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
EQIN
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
SIG
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
MIC
INSERT
LINE
DIROUT
48V
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
33-34
-15 + 15
HF
12k
-15
HM
+15
2k5
-15
LM
+15
250Hz
-15
LF
+15
80Hz
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
HF
12k
EQIN
10
-30
-20
-5
0
5
-10
ST1
LEV
OO
10
-30
-20
-5
0
5
-10
OO
ToLR
ToCH
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
PRE
POST
OO
OO
OO
OO
+6
AUX5
POST
+6
AUX6
POST
OO
OO
ODD
BAL
L
EVEN
R
=
MUTE
PFL
PK!
SIG
10
OO
30
20
ST1 IN
R
ST2
L/M
R
10
-30
-20
-5
0
5
-10
ST3
LEV
OO
ToLR
ToCH
PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL PFL
ST3
L
R
ST4
L/M
R
STEREOINPUTS
ST2
LEV
IN
IN IN
-15 +15
HF
12k
-15
HM
+15
2k5
-15
LM
+15
250Hz
-15
LF
+15
80Hz
EQIN
10
-30
-20
-5
0
5
-10
OO
ST4
LEV
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
PRE
POST
OO
OO
OO
OO
+6
AUX5
POST
+6
AUX6
POST
OO
OO
ODD
BAL
L
EVEN
R
=
MUTE
PFL
PK!
SIG
0
10
OO
30
20
35-36
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
17
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
OO
R
OO
L
OO
+6
+6
+6
2
3
GRP
4
OO
GRP
OO
1
GRP
OO
GRP
+6
+6
+6
1
OO
M
+6
MIC
INSERT
LINE
DIROUT
48V
17
17
17
17
OO
R
OO
L
OO
+6
+6
+6
2
3
GRP
4
OO
GRP
OO
1
GRP
OO
GRP
+6
+6
+6
OO
M
+6
OO
LEVEL
+6
AFL
OO
LEVEL
+6
AFL
AUX1AUX2AUX3AUX4AUX5AUX6
GRP 1GRP2GRP3GRP4
INSERT1INSERT 2INSERT 3INSERT4
USB
SENDRETURN
AUXOUT
GROUPOUT
MTX1MTX 2
MATRIX
OUT
L
L
R
L
R
2TRK IN
2TRK OUT
INSERTL
INSERTR
INSERTM
L
R
MAINOUT
M
PHONES
MIN MAX
TB MIC
MIN MAX
M
LR
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/AFLACTIVE
Talkto LRM
Talkto AUX1-4
POWER
MTX
1-2
AUX
1-2
AUX
5-6
LR
pre-fade
Allup= LRpost
OO +6
PLAYBACK
ToLR
ALLEN&HEATH
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
L-R
M
PAN
L R
=
PAN
L R
=
PAN
L R
=
PAN
L R
=
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
PK!
+6
0
SIG
MUTE
AFL
MUTE
AFL
MUTE
AFL
MUTE
AFL
MUTE MUTE MUTE
AFL AFL AFL AFL AFL AFL
GRP L R M
L-R
M
L-R
M
L-R
M
0
0
1 2 3 4
USB
2TRK
PLAYBACK SOURCE
LEVEL
PLAYBACK
LEVEL
TB
LEVEL
PHONES
PFL
USBSENDSOURCE
ST3INPUTSOURCE
USB
ST3IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
18
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
18
18
18
18
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
19
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
19
19
19
19
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
20
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
20
20
20
20
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
21
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
21
21
21
21
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
22
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
22
22
22
22
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
23
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
23
23
23
23
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
24
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
24
24
24
24
IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN
L R M
MATRIX 2MATRIX
1GRP 2GRP3GRP4
M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
0M
L-R
1-2
3-4
M
L-R
1-2
3-4
M
L-R
1-2
3-4
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
25
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
25
25
25
25
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
26
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
26
26
26
26
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
27
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
27
27
27
27
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
28
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
28
28
28
28
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
29
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
29
29
29
29
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
30
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
30
30
30
30
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
31
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
31
31
31
31
IN
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
32
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
HPF
100Hz
-15
LF -15
+15
+15
180
45
LM35Hz
70
-15
400
1k
250
+15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+15
HF
EQIN
12k
80Hz
ODD
PAN
L
EVEN
R
=
MUTE
PK!
PFL
SIG
M
L-R
1-2
3-4
0
10
OO
30
20
MIC
INSERT
LINE
DIROUT
48V
32
32
32
32
IN
AUX1 AUX2 AUX3 AUX4 AUX5 AUX6
OO +10
0
OO +10
0
OO +10
0
OO +10
0
OO +10
0
OO +10
0
PFL
ZED-420 = 715mm (28.2 inches)
ZED-428 = 930mm (36.6 inches)
ZED-436 = 1135mm (44.7 inches)
120
129
50
R23

Allen & Heath 14 ZED-4 BUS User Guide
BLOCK DIAGRAM
+
-
GAIN
HM HF
4 BAND EQUALISER
MONO CHANNEL
ZED-4 BLOCK DIAGRAM
100Hz
MIC IN
FADER
PFL
PEAK
STEREO CHANNEL
AUX1
AUX 2
LF
ST1 R
L
R
L
GAIN
STEREO INPUT 1
+
+
-
LINE IN
+48V
INSERT
MUTE
PAN
GAIN
LR
SUM HF
4 BAND EQUALISER
LF
L INSERT
R INSERT LEFT
RIGHT
MAIN LR
HPF
PFL/AFL RIGHT LEFT
CHAN
MAIN OUT
PHANTOM POWER SWITCH
+4dBu NOMINAL
LM
EQ
IN
MONO
L-R
1-2
3-4
M
AUX3
AUX 4
AUX5
AUX 6
PRE
DIRECT OUT
SIGNAL
HFLF
EQ
IN FADER
PFL
AUX1
AUX 2
MUTE
BAL L-R
1-2
3-4
M
AUX3
AUX 4
AUX5
AUX 6
PRE
+
+ +
GROUP 2 GROUP 1 GROUP 3 AUX 1 GROUP 4 AUX 2 AUX 3 AUX 4 AUX 5 AUX 6
+
+
PEAK
SIGNAL
ST3 R
LGAIN
STEREO INPUT 3
LR
CHAN
MIX BUSES
BALANCED
M INSERT
MONO
AUX1
MASTER LEVEL
AUX1
+4dBu NOMINAL
BALANCED OPTION
-2dBu NOMINAL
IMPEDANCE BALANCED
FACTORY FIT
SERVICE CENTRE OPTION FIT
AFL
GROUP1 INSERT
GROUP1
AFL
+4dBu NOMINAL
BALANCED
GROUP1 FADER
MTX 1-2
AUX 1-2
AUX 5-6
USB I/O
USB
RETURN
USB DEVICE
PRIORITY SWITCHING
L-R PRE
GRP1
MUTE
PAN
L-R
M
METER
GRP2 GRP3 GRP4 L R M MATRIX1
MASTER LEVEL
MATRIX1
+4dBu NOMINAL
BALANCED OPTION
-2dBu NOMINAL
IMPEDANCE BALANCED
FACTORY FIT
SERVICE CENTRE OPTION FIT
MINI BUS
AFL
L-R POST
FROM MATRIX 2
FROM AUX 2
FROM AUX 6
FROM AUX 5
LR / M METERS
PHONES
LEVEL
HEADPHONES
PFL/AFL
PFL ACTIVE
GROUPS 2 TO 4 THE SAME
AUXES 2 TO 6 THE SAME
TALKBACK
ON
48V PHANTOM POWER
OFF
MIC IN
TALKBACK
BALANCED
2= +
GAIN
ST3 INPUT SOURCE
USB RETURN
PLAYBACK
LEVEL
2 TRACK IN R
L
PLAYBACK
SOURCE
L-R
PFL
+
AUX 1-4
L-R-M
TIP SEND
TIP SEND
TIP SEND
TIP SEND
+10dB
+10dB
+10dB
+10dB
R
L
FACTORY SOLDER LINK
FACTORY SOLDER LINK
USB
OUTPUT
USB
OUTPUT
RECORD
OUTPUT
L R
ST2
MAIN M
MUTE
MUTE
MUTE
MATRIX 2 THE SAME

Allen & Heath 15 ZED-4 BUS User Guide
MONO INPUT CHANNEL
1
2
3
4
5
1
Microphone Input Socket
Standard 3-Pin XLR socket wired as Pin 1=Chassis, Pin 2=hot (+),
Pin 3=Cold (-).
2
Line Input Jack Socket
Standard 1/4” (6.25mm) Jack socket for balanced or unbalanced line
level signals. Wired Tip=Hot(+), Ring=cold (-), Sleeve=Chassis.
The Line input overrides the Mic input, so if you want to hear some-
thing plugged in to the xlr socket, make sure nothing is plugged into
the Line input.
3
Insert Jack Socket
Standard 1/4” (6.25mm) Jack socket for unbalanced insert send and
return signals. Wired Tip=send, Ring=return, Sleeve=Chassis. Nom-
inal level is 0dBu. The insert point is after the 100Hz filter and be-
fore the EQ.
4
Gain Control
This adjusts the gain of the input amplifier to match the signal level
of the input. The gain is varied from –6dB (attenuation) to +63dB
for signals plugged in to the xlr socket (Mic Input) and –10dB to
+26dB for signals plugged into the Line input jack.
5
100Hz Hi-pass Filter
The Hi-pass filter is used for reducing pop noise and rum-
ble from microphone signals. It is a 2-pole (12dB per oc-
tave) filter with a corner frequency set at 100Hz.
The filter affects signals from both Mic XLR and Line jack
socket.
10.00 Hz 100.00 1000.00 10000.00 30000.00
-50.00
-40.00
-30.00
-20.00
-10.00
0.00
10.00
dBr
6
6
48V Phantom Power Switch
Applies +48V to pins 2 and 3 of the XLR input though 6k8 resistors
for phantom powered condenser microphones.
MIC
INSERT
LINE
-6-10 63 26
GAIN
MIC
0
LINE
10
0
10 20 30
40
50
DIR OUT
48V
HPF
100Hz
1
1
1
1
IN
Direct Output Socket
Standard 1/4” (6.25mm) Jack socket. Wired Tip=Hot(+),
Ring=cold (-), Sleeve=Chassis. For recording individual channels,
factory default is prefade signal (post mute).
The nominal level is 0dBu and the output is impedance balanced.
7
7

Allen & Heath 16 ZED-4 BUS User Guide
MONO INPUT CHANNEL
7
8
HMF EQ
The HMF (High Mid Frequency) equaliser affects the upper middle
of the audible frequency range. The frequency graduations on the
sweep control are the centre frequencies of the EQ.
HF EQ
The HF (High Frequency) equaliser affects the frequency response
of the higher audible frequencies. The corner frequency of 12kHz is
around 3dB from the maximum cut or boost of the circuit.
6
-15
LF -15
+ 15
+ 15
180
45
LM 35Hz
70
-15
400
1k
250
+ 15
3k
HM
700
500Hz
-15
1k
6k
15k
4k
+ 15
HF
EQIN
12k
80Hz
7
8
6
20.00 Hz 100.00 1000.00 10000.00 30000.00
-20.00
-15.00
-10.00
-5.00
0.00
5.00
10.00
15.00
20.00
dBr
ZED4 HF EQ
20.00 Hz 100.00 1000.00 10000.00 30000.00
-20.00
-15.00
-10.00
-5.00
0.00
5.00
10.00
15.00
20.00
dBr
ZED4 HMF EQ
LMF EQ
The LMF (Lower Mid Frequency) equaliser affects the lower middle
of the audible frequency range.
20.00 Hz 100.00 1000.00 10000.00
-20.00
-15.00
-10.00
-5.00
0.00
5.00
10.00
15.00
20.00
dBr
ZED4 LMF EQ

Allen & Heath 17 ZED-4 BUS User Guide
LF EQ
The LF (Low Frequency) equaliser affects the response at the low
end of the audio range. The graph shows the response of the LF EQ
at maximum cut and boost. The corner frequency is 80Hz.
MONO INPUT CHANNEL
9
10
11
11
12
9
Auxes 1 & 2
Each of these controls sends a signal to an auxiliary bus. The signal is
sourced pre-fade which means that the level is independent of, and
unaffected by the fader. Auxes 1 & 2 are primarily used for foldback
monitoring purposes, as the fader does not affect the level. They can
also be used as feeds for recording and are available sources to the
USB interface for this purpose.
These sends are affected by the Mute switch, so muting the channel
will also mute the Aux sends.
The control varies the signal level to the bus from off (fully attenuat-
ed) to +6dB, with unity gain at the arrow.
There are master level controls for all of the Aux outputs situated in
the master section of the mixer.
10
Auxes 3 & 4
These are switched pre or post-fade so they can be used as either
monitor sends or effects sends.
12
13
20.00 Hz 100.00 1000.00 10000.00
-20.00
-15.00
-10.00
-5.00
0.00
5.00
10.00
15.00
20.00
dBr
ZED4 LF EQ
EQ IN
The EQ IN switch enables the equaliser when pushed in. The EQ is
bypassed when the switch is in its up position.
+6
AUX1
PRE
+6
AUX2
PRE
+6
AUX3
+6
AUX4
+6
AUX5
POST
+6
AUX6
POST
PRE
POST
OO
OO
OO
OO
OO
OO
-15
LF
+ 15
EQIN
80Hz
Auxes 5 & 6
Sourced post fade, so that the level is set with the send control but
will be affected by the fader position. Mainly used for effects.
13

Allen & Heath 18 ZED-4 BUS User Guide
14
PAN
The pan control adjusts how the signal from the mono input channel is
shared between the left and right buses and subsequently the main stereo
outputs, similarly to pairs of Groups. Set to the mid position, equal amounts
of signal are fed to left and right, with pan set to L, none is sent to the Right
bus.
PFL Switch
The PFL (Pre-Fade Listen) switch sends the channel signal to the PFL bus
and subsequently to the headphones and the main L R meters. Used for
checking the audio signal before raising the fader or un-muting the channel.
15
Mute Switch
This mutes or cuts the signal to the buses and the Direct Out. A rectangular
LED illuminates to show the Mute switch is pressed.
14
Routing Switches
The routing switches connect the post-fade signal to the mix buses via the
pan control for the main LR bus and the group buses. For minimum noise
from the mix bus summing amplifier, leave the switches in their up positions
if the channel signal is not required on the bus.
MONO INPUT CHANNEL
1
ODD
PAN
L
EVEN
R
=
MUTE
PK !
PFL
SIG
M
L-R
1-2
3-4
10
OO
30
20
0
15
Signal & PK! LED
The Signal LED illuminates dimly at a threshold of –16dB nominal level and
gets brighter with higher level signal. The source for the signal & peak LED’s
is just after the EQ IN switch.
The PK! LED illuminates when the signal just after the EQ IN switch is with-
in 5dB of clipping.
16
17
18
16
17
18
19 19
Fader
The 100mm fader affects the level of the channel signal to the left & right,
mono and group buses and Auxes 5 & 6. Also Auxes 3 & 4 if switched to
post-fade. There is 10dB of gain at the top and the unity gain position is
marked by “0”.

Allen & Heath 19 ZED-4 BUS User Guide
STEREO INPUT CHANNEL
2
4
1 ST1 (& ST3) Phono sockets
These are stereo inputs additional to the main stereo channel in-
puts (below). The gain is varied by the ST1 (& ST3) level control
and these inputs can be sent to either the stereo channels or
straight to the L R main bus, depending on the setting of the under-
panel switch. These inputs are unbalanced.
The source for the ST3 input can be switched from the phono
sockets to the USB return signal with the selector switch below the
USB socket.
1
5
3
2
Stereo Inputs 1 (& 3) Level control
Adjust the level of the stereo inputs 1 & 3 from off (fully attenuat-
ed) to maximum where it has 10dB of gain.
3
4
5
ST1 (& 3) Routing selector switch
This switch selects whether the ST1 (or ST3) signal is sent to the L
R bus directly, or the stereo channel below. When it is pressed in,
the ST1 (or ST3) signal sums together with the main stereo inputs
ST2 (or ST4).
ST2 (& ST4) input jack sockets
Standard 1/4” jack sockets for line level stereo signals. Can be used
with a mono input where the L/M input will also connect to the R
input if nothing is plugged in to R.
The Stereo 1 inputs accept unbalanced or balanced signals.
Stereo Input ST2 (& ST4) Level control
Adjusts the level of the ST2 (& ST4) input. The range is from off to
+10dB.
10
-30
-20
-5
0
5
-10
ST1
LEV
OO
10
-30
-20
-5
0
5
-10
OO
To LR
To CH
ST1 IN
R
ST2
L/M
R
ST2
LEV
IN
L

Allen & Heath 20 ZED-4 BUS User Guide
STEREO INPUT CHANNEL
STEREO Channel EQ
The EQ on the stereo Channel is 4 band, fixed frequency and com-
prises a shelving high frequency section, a shelving low frequency
section and two fixed mid frequency controls.
6
7
-15 + 15
HF
12k
-15
HM
+ 15
2k5
-15
LM
+ 15
250Hz
-15
LF
+ 15
80Hz
EQIN
20.00 Hz 100.00 1000.00 10000.00 30000.00
-20.00
-15.00
-10.00
-5.00
0.00
5.00
10.00
15.00
20.00
dBr
ZED4 STEREO HF EQ
STEREO HF EQ
STEREO LF EQ
10.00 Hz 100.00 1000.00 10000.00
-20.00
-15.00
-10.00
-5.00
0.00
5.00
10.00
15.00
20.00
dBr
ZED4 STEREO LF EQ
10.00 Hz 100.00 1000.00 10000.00
-20.00
-15.00
-10.00
-5.00
0.00
5.00
10.00
15.00
20.00
dBr
ZED4 STEREO MF EQ
STEREO LMF AND HMF EQ
EQ IN
The EQ IN switch enables the
equaliser when pushed in. The
EQ is bypassed when the switch
is in its up position.
6
7