User Guide

Allen & Heath 28 ZED-4 BUS User Guide
USING USB FOR EFFECTS
1
4
5
6
7
8
1
2
3
4
5
6
7
8
9
Use post fade Aux 5 & 6 as the sends from ZED so when you move the channel
fader the effects level stays in proportion.
Select Aux 5-6 on the USB output selector switches.
USB lead carries the digital signals to & from the computer.
Select USB Device Left for Aux 3 or Right for Aux 4 as the input for the track in
the software package.
You can use a send bus in software as you would a hardware mixer.
Assign an effect from your software plug-in list.
If using reverb, it’s a good idea to have 100% wet mix level and reduce the pre-
delay in order to compensate for any latency in USB.
Send the output of the software group or bus to USB Device. In this case, and
probably with most reverbs, it will be stereo so it will go to left & right.
Set the USB return to be sent to ST3. It can then be sent directly to LR or to the
stereo channel by pressing in the under-panel switch below the ST3 Level control.
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
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
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
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 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 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
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
IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN IN
L R M
MATRIX 2MATRIX
1 GRP2 GRP3 GRP4
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
PFL
+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
EQ IN
80Hz
2
3
9