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USER GUIDE
Publication AP7028
Allen & Heath 3 ZED-4 BUS User Guide
Limited One Year Warranty
This product is warranted to be free from defects in materials or
workmanship for period of one year from the date of purchase by the
original owner.
To ensure a high level of performance and reliability for which this
equipment has been designed and manufactured, read this User Guide
before operating. In the event of a failure, notify and return the
defective unit to ALLEN & HEATH Limited or its authorised agent as
soon as possible for repair under warranty subject to the following
conditions
Conditions Of Warranty
The equipment has been installed and operated in accordance with the
instructions in this User Guide.
The equipment has not been subject to misuse either intended or
accidental, neglect, or alteration other than as described in the User
Guide or Service Manual, or approved by ALLEN & HEATH.
Any necessary adjustment, alteration or repair has been carried out by
ALLEN & HEATH or its authorised agent.
This warranty does not cover fader wear and tear.
The defective unit is to be returned carriage prepaid to ALLEN &
HEATH or its authorised agent with proof of purchase.
Units returned should be packed to avoid transit damage.
In certain territories the terms may vary. Check with your ALLEN &
HEATH agent for any additional warranty which may apply.
This product complies with the European Electro magnetic Compatibility
directives 89/336/EEC & 92/31/EEC and the European Low Voltage
Directives 73/23/EEC & 93/68/EEC.
This product has been tested to EN55103 Parts 1 & 2 1996 for use in
Environments E1, E2, E3, and E4 to demonstrate compliance with the
protection requirements in the European EMC directive 89/336/EEC.
During some tests the specified performance figures of the product were
affected. This is considered permissible and the product has been passed as
acceptable for its intended use. Allen & Heath has a strict policy of
ensuring all products are tested to the latest safety and EMC standards.
Customers requiring more information about EMC and safety issues can
contact Allen & Heath.
ZED 4 BUS User Guide AP7028 Issue 1
Copyright © 2007 Allen & Heath Limited. All rights reserved
Allen & Heath Limited
Kernick Industrial Estate, Penryn, Cornwall, TR10 9LU, UK
http://www.allen-heath.com
Allen & Heath 5 ZED-4 BUS User Guide
SAFETY INSTRUCTIONS
WARNINGS
-
Read the following before proceeding :
CAUTION
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
L
LIVE BROWN BLACK
N
NEUTRAL BLUE WHITE
E
EARTH 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 stor-
ing. Avoid tobacco ash, smoke, drinks spillage, and exposure to rain and mois-
ture. If the console becomes wet, switch off and remove mains power imme-
diately. 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 po-
tentiometers 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
SONAR LE software introduction . 28
SONAR LE installation ..................... 29
Configuring SONAR LE with ZED. 29
Using USB for effects........................ 32
Wiring Notes ..................................... 33
Product Support ................................ 34
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
DIR OUT
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
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
48V
MIC
INSERT
LINE
DIR OUT
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
EQ IN
10
-30
-20
-5
0
5
-10
ST1
LEV
OO
10
-30
-20
-5
0
5
-10
OO
To LR
To CH
+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
To LR
To CH
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
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
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
EQ IN
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
DIR OUT
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
1
AUX
2
AUX
3
AUX
4
AUX
5
AUX
6
GRP
1
GRP
2
GRP
3
GRP
4
INSERT
1
INSERT
2
INSERT
3
INSERT
4
USB
SENDRETURN
AUX OUT
GROUP OUT
MTX
1
MTX
2
MATRIX
OUT
L
L
R
L
R
2TRK IN
2TRK OUT
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/AFL ACTIVE
Talk to LRM
Talk to AUX 1-4
POWER
MTX
1-2
AUX
1-2
AUX
5-6
LR
pre-fade
All up =LR post
OO
+6
PLAYBACK
To LR
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 M UTE
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
00
1 2 3 4
USB
2TRK
PLAYBACK SOURCE
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
EQ IN
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
DIR OUT
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
EQ IN
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
DIR OUT
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
EQ IN
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
DIR OUT
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
EQ IN
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
DIR OUT
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
EQ IN
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
DIR OUT
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
EQ IN
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
DIR OUT
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
EQ IN
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
DIR OUT
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 I N IN IN
L R M
MATRIX
2
MATRIX
1
GRP
2
GRP
3
GRP
4
M
L-R
1-2
3-4
0
M
L-R
1-2
3-4
0
M
L-R
1-2
3-4
0
M
L-R
1-2
3-4
0
M
L-R
1-2
3-4
0
M
L-R
1-2
3-4
0
M
L-R
1-2
3-4
0
M
L-R
1-2
3-4
0
M
L-R
1-2
3-4
0
M
L-R
1-2
3-4
0
M
L-R
1-2
3-4
0
M
L-R
1-2
3-4
0
M
L-R
1-2
3-4
0
M
L-R
1-2
3-4
0
M
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
AC MAINS IN ~
100 - 240V~ 47-63Hz 60W MAX
REFER SERVIC ING TO QUALIFIED SERVICE PERSONNEL.
REPLACE FUSE WITH SAME TYPE AND RATING.CAUTION: FOR C ONTINUED PROTECTION AGAINST RISK OF FIRE
ATTENTION: RE MPLACER PAR UN FUSIBL E STRICTEMENT IDENTIQUE EN VALE URS.
DO NOT OPEN
CAUTION
RISK OF ELEC TRIC SHOCK
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR.
WARNING: TO RE DUCE THE RISK OF ELECTRIC SHOCK DO NOT EXPOSE T HIS APPARATUS TO RAIN OR MOISTURE.
ALLEN&HEATH
OFF
0 I
ON
WARNING: T HIS APPARATUS MUST BE EARTHED
Serial No.
ENGINEERE D IN ENGLAND BY ALLEN & HEATH LIMITED.
(2) this device must accept any interference received,
This device c omplies with Part 15 of the FCC Rules.
(1) this device may not cause harmful interference, and
Operation is subject to the foll owing two condition s:
including inte rference that m ay cause undesired operation.
T1.6A L 250V 20mm
FUSE
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 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
within 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”.
18

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