Allen and Heath ML-4000 Owners manual

Dual Function Live Sound Console

USER GUIDE

Publication AP4314

Introduction

This user guide presents a quick reference to the ML4000. We recommend that you read this fully
before starting. Included is information on installing, connecting and operating the console, panel
drawings, system block diagram and technical specification. For further information on the basic
principles of audio system engineering, please refer to one of the specialist publications available
from bookshops and audio equipment dealers.

Whilst we believe the information in this guide to be reliable we do not assume responsibility for
inaccuracies. We also reserve the right to make changes in the interest of further product
development.

We are able to offer further product support through our world-wide network of approved dealers
and service agents. You can also access our Web site on the Internet for information on our
product range, assistance with your technical queries or simply to chat about matters audio. To
help us provide the most efficient service please keep a record of your console serial number, and
date and place of purchase to be quoted in any communication regarding this product. The serial
number is located on the rear panel.

Check out our home site for information on the company and its pedigree, our full product range
and our design philosophy. We also have a site dedicated to the exciting ML Series consoles.

www.mlseries.com

www.allen-heath.com

ML4000 User Guide AP4314 Issue 4

Copyright © 2003 Allen & Heath Limited. All rights reserved

Manufactured in the United Kingdom by Allen & Heath Limited

Kernick Industrial Estate, Penryn, Cornwall, TR10 9LU, UK

http://www.allen-heath.com

2 ML4000 User Guide

Contents

Introduction.......................................................... 2

Warranty............................................................... 4

Important Safety Instructions .............................. 5

Mains Plug Wiring Instructions............................ 6

General Precautions ............................................ 6

ML4000 Key Features ......................................... 7

Quick Start Sheet................................................. 8

System Block Diagram ...................................... 10

Technical Specifications.................................... 12

The Range ......................................................... 13

Installation Details.............................................. 13

Connecting the Power Supply .......................... 14

Turning the Console On or Off .......................... 14

Configuring Groups and Auxes......................... 34

Main Mix Masters............................................... 35

Using the Engineers Wedge Monitor ................ 35

Matrix ................................................................. 36

2-Track Output................................................... 37

VCA Groups....................................................... 38

VCA Groups Explained...................................... 38

Assigning VCA Groups...................................... 40

Mute Groups...................................................... 41

Assigning Mute Groups..................................... 41

Snapshot Memories .......................................... 42

Channel Automation Safes................................ 42

Headphones / Local Monitor / PAFL ................. 43

Earthing.............................................................. 15

Rear Panel Connections.................................... 16

Audio Connector Types and Wiring .................. 18

Gain Structure.................................................... 19

Control Layout and Description ........................ 20

Mono Input and EQ ........................................... 22

Using the Equaliser ........................................... 23

Channel Group / Auxiliary Sends ...................... 24

Channel Internal Link Options........................... 25

Using the GRP/AUX Sends ............................... 25

Channel Main Mix and Fader ............................ 26

Removing the Fader .......................................... 27

Checking the Channel Signal Level .................. 27

Using LCRplus™................................................ 28

Oscillator / Noise Generator.............................. 45

Intercom............................................................. 46

Talkback ............................................................ 47

Meterpod ........................................................... 48

Meter Types ....................................................... 49

MIDI Overview.................................................... 50

Changing the MIDI channel number ................. 50

MIDI Channel Mutes .......................................... 51

MIDI Snapshot Messages ................................. 51

MIDI AFL Messages........................................... 51

Archiving the Console Settings ......................... 52

Operating System Technical Support............... 53

Operating Software Version Number ................ 53

Loading New Operating Software ..................... 53

Stereo Input and EQ.......................................... 30

Using the Dual Inputs ........................................ 31

Group / Aux Fader and Rotary Masters ............ 32

ML4000 User Guide 3

Console Reset ................................................... 53

Blank for User Notes ......................................... 54

Cue Sheet .......................................................... 55

Limited One Year Warranty

This product has been manufactured in the UK by ALLEN & HEATH and 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 or
its authorised agent as soon as possible for repair under warranty subject to the
following conditions :

Conditions Of Warranty

1. The equipment has been installed and operated in accordance with the
instructions in this User Guide

2. 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.

3. Any necessary adjustment, alteration or repair has been carried out by ALLEN
& HEATH or its authorised agent.

4. The defective unit is to be returned carriage prepaid to ALLEN & HEATH or its
authorised agent with proof of purchase.

5. 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 Electromagnetic
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.

NOTE: Any changes or modifications to the console not approved by Allen &
Heath could void the compliance of the console and therefore the users
authority to operate it.

4 ML4000 User Guide

Important 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 power unit. Follow the operating
instructions printed in this user guide and the power unit user guide.

Do not remove covers: Operate the power unit with its covers correctly fitted. Refer any service work

to competent technical personnel only.

Power sources: Connect the power unit to a mains power 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 supply 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 tamper with the ground connection in the power cord.

WARNING: This equipment must be earthed.

Water and moisture: To reduce the risk of fire or electric shock do not expose the power unit or

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 or power unit

where the air flow required for ventilation is impeded. If the console is to be
operated in a flightcase ensure that it is constructed to allow adequate
ventilation.

Heat and vibration: Do not locate the power unit in a place subject to excessive heat or direct

sunlight as this could be a fire hazard. Locate the console and its power unit
away from any equipment which produces heat or causes excessive
vibration.

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.

ML4000 User Guide 5

Important Mains Plug Wiring Instructions.

The power unit 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 mains lead wires are coloured in accordance with the following code:

TERMINAL

L

LIVE BROWN BLACK

N

NEUTRAL BLUE WHITE

E

EARTH GND GREEN & YELLOW GREEN

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 symbol.

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

WIRE COLOUR

European USA/Canada

Damage : To prevent damage to the controls and cosmetics avoid placing heavy

objects on the control surface, scratching the surface with sharp objects, or
subjecting the console to 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 power
immediately. Allow to dry out thoroughly before using again.

Radiation : To avoid induced noise and interference pickup do not operate the console

close to strong sources of electromagnetic radiation such as power supplies,
video monitors, lighting cables and dimmers.

Cleaning : Avoid the use of chemicals, abrasives or solvents. The control panel is best

cleaned with a soft brush and dry lint-free cloth. Stubborn marks can be
removed using a cloth dampened with isopropyl alcohol. Do not leave
marking tape stuck to the console for long periods of time as the adhesive
can degrade and leave a sticky residue. The faders, switches and
potentiometers are lubricated for life. The use of electrical lubricants on these
parts is not recommended. Refer to the power unit user guide for instructions
on cleaning its ventilation filters.

Transporting : The console should be transported in the original packing or purpose built

foam lined flightcase. Protect the control surface from damage during transit.
The console is a large and heavy item. To avoid injury ensure adequate man
power and precaution when lifting or moving the console.

6 ML4000 User Guide

ML4000 Key Features

The Allen & Heath ML4000 is a large format VCA equipped dual function live sound console
providing many of the features of its larger brother the ML5000. It can be quickly configured for
front-of-house (FOH) or stage monitor mixing. As one console suitable for both applications it is
equally well suited to installation, rental and touring. It offers an IO capability and feature set that
satisfies the latest trends in live sound engineering, in particular the growing number of inputs and
outputs for multi-speaker house and monitor systems, demands of stereo in-ear monitoring, 3
speaker LCR imaging, advanced grouping and automation. The design ensures on-the-road
durability, a clear layout for easy walk up and go operation, and no-compromise audio
performance.

Inputs and Outputs

• 4 Standard frame sizes: 24+2, 32+2, 40+2, 48+2 (mono + dual stereo channels)

• Optional ‘B’ versions: 20+6, 28+6, 36+6, 44+6 (mono + dual stereo channels)

• 24, 32, 40, 48 mono mic/line inputs with inserts and direct outputs

• 2 dual stereo line inputs standard (6 optional)

• 24 input sidecar to expand to a maximum 96 inputs

• Main Left, Right and Centre outputs with inserts, Centre configurable as the engineers monitor

• 8 Groups, 12 Auxes: Group/Aux 1-8 and Aux 9-12 with faders and inserts, Aux 1-8 with rotaries

• 11x4 Matrix

• 2-Track monitor input and recording send

• Stereo headphones and local monitors

• Talkback mic input

• ClearCom compatible intercom interface

Groups and Automation

• 8 VCA groups with mutes and PAFL monitoring

• 8 audio groups with LCRplus™ sub grouping

• 8 mute groups

• MIDI accessible snapshot memories

• MIDI mute on/off, snapshot recall and dump in/out control

• Channels can be made safe from the automation

Processing and Control

• 4-Band full sweep mono EQ with switched Q mids, 4-band fixed frequency stereo EQ

• Sweepable high pass filter

• LCRplus™ 3 speaker imaging system

• Protected mode switching to configure the console for FOH or monitor application

• Intelligent PAFL system with all-clear, PFL/in-place AFL, priority, auto-cancel/add mode…

• Assignable talkback and intercom

• 1kHz tone and pink noise generator for system line-up and testing

• Full console monitoring and extensive metering of inputs, mix busses and outputs

ML4000 User Guide 7

AUX MIX

GROUP MIX

mode

INSERT

AUX

1

OO

AUX

MUTE

EDIT/SAFE

PK

+6

0

-6

SIG

5

0

5

10

20

30

OO

GROUP

+6

AFL

TB

AFL

FOH
MONITOR

6

OO

7

OO

8

OO

MATRIX

down

AUX OUT

GROUP OUT

+6

+6

+6

SUBGROUP

WEDGE

mode

QUICK START SHEET

Copy this sheet to keep with the console for guest user reference.

Configure the Mode Switches :

Use a pen or pointed object to select the underpanel
mode switches.

FRONT-OF-HOUSE

AUX 1-8 = AUX 1-4 and 5-8 switchable pre or post­fade. Rotary masters.

AUX 9-12 = Switchable pre or post-fade and mono
or stereo in pairs. Fader masters with inserts.

GROUP 1-8 = Audio groups with paired routing
switches. Fader masters with subgrouping and
matrix sends.

MONITOR

AUX 1-8 = Monitor mix 1-4 and 5-8 switchable pre
or post-fade. Fader masters with inserts. Group mix
on rotary masters.

AUX 9-12 = Monitor mix 9-12 switchable pre or
post-fade and mono or stereo in pairs. Fader
masters with inserts.

MAIN C OUT = Engineers wedge monitor.

DUAL MODE

+

LCR
BLEND

LR

PAN

L

C

MONITOR

MAIN
MIX

=

C

=

R

#

BLEND

PAN

BLEND

PAN

MONO PA

LRC

BLEND

CLR

PAN

RL

STEREO PA LCR

LRC

BLEND

CLR

PAN

RL

Set the mode switches to configure fader masters 1­8 in any combination of audio groups and aux
sends.

Using LCRplus™

STEREO+FILL

LRC

CLR

RL

LRC

CLR

RL

PAN and BLEND = Two
controls adjust the balance
between L, R and C.

MAIN MIX = Routes the
channel to the main L,R,C
outputs.

+

LCR

BLEND

LR C

PAN

=

MAIN

MIX

=

RL

8 ML4000 User Guide

CHANNEL

PAN

PRE-FADE SENDS
POST-FADE SENDS

SUBGROUP

PAN

L

MAIN MIX

R
C

MATRIX SEND

How to Assign a VCA or MUTE GROUP :

1. Press EDIT GROUP. The key flashes.

2. Press MUTE on the master you want to edit. It flashes.

3. Press the channel MUTE keys to assign or remove them
from the group.

INSERT

MASTER
FADER

AUDIO GROUP

L

MAIN MIX

R
C

VCA GROUP

CHANNEL
FADER

CHANNEL

PAN

VCA

+

DC

ASSIGN

AUDIO BUSS

PRE-FADE SENDS
POST-FADE SENDS

ASSIGN

CHANNEL

FADER

MASTER
FADER

DC VOLTAGE

Problems ?

www.allen-heath.com

The channel is routed but there is no
audio. If it is assigned to a VCA group

check that the group fader is up.

The audio groups do not work. Check
the setting of the fader master 1-8
GRP/AUX mode switches.

The PAN control does not work. For
main mix check the setting of the BLEND
control. For groups check the GRP PAN
ON switch.

The console takes a long time to
power up. Check the rear panel slide

switch setting. RS232 takes longer to
boot in than MIDI.

The channel does not respond to MIDI.
Check that it has not been made safe
(green SAFE/EDIT LED on in normal
console mode).

4. Check which channels are assigned on the channel
SAFE/EDIT LEDs.

5. Press the next master to edit. Press EDIT GROUP when
finished to return to exit edit mode.

M

EDIT

U

GROUP

T
E

SAFE

SELECT GROUP TO EDIT
ASSIGN USING CH MUTES

PAFL

MUTE

10

5

SAFE/EDIT

PK

+6

0

-6

SIG

PFL / AFL

INPUT PAFL

MUTE

PAFL

10

5

AUTO
CANCEL

ADD MODE

PFL
AFL

IN-PLACE

Using P/AFL :

Input PAFL = Select mono PFL or
stereo in-place AFL.

Output AFL = Press one for
mono, two together for stereo.

CLEAR
ALL

5

7

10

20

-

5

7

10

20

-

5

7

10

20

-

5

7

10

20

-

Input PAFL overrides output AFL.
Output AFL cancels input PAFL.

5

3

1

0

3

5

3

1

0

3

5

3

1

0

3

5

3

1

0

3

5

3

7

1

0

10

3

20

-

+

-

+

-

+

-

+

5

5

3

7

1

0

10

3

20

5

5

3

7

1

0

10

3

20

5

5

3

7

1

0

10

3

20

5

5

3

7

1

0

10

3

20

-

+

-

+

-

+

-

+

5

+

5

3

7

1

0

10

3

20

5

+

5

3

7

1

0

10

3

20

5

+

5

3

7

1

0

10

3

20

5

+

16

16

16

12

1212
99
6
3
0
3
6
9
12
15
18
21 21

27
30

off

16

99
6
3
0
3
6
9
12
15
18
21 21

27
30

AFL-L

16

99
6
3
0
3
6
9
12
15
18
21 21

27
30

off

16

99
6
3
0
3
6
9
12
15
18
21 21

27
30

AFL-L

AFL-R

AFL-R

9
6

6

3

3

0

0

3

3

6

6

9

9

12

12

15

15

18

18

21
24

2424

27

27

30

30

off

PFL

16

16

1212

12
9

6

6

3

3

0

0

3

3

6

6

9

9

12

12

15

15

18

18
21
24

2424

27

27

30

30

AFL-M

16

16

12

1212

9
6

6

3

3

0

0

3

3

6

6

9

9

12

12

15

15

18

18

21
24

2424

27

27

30

30

AFL

off

16

16

1212

12
9

6

6

3

3

0

0

3

3

6

6

9

9

12

12

15

15

18

18
21
24

2424

27

27

30

30

AFL-M

PAFL

AFL

CALL

PAFL

AFL

CALL

PAFL

AFL

CALL

PAFL

AFL

CALL

ML4000 User Guide 9

SYSTEM BLOCK DIAGRAM

MONO CHANNEL

PAD

GAIN

+

-

DIRECT OUT
OPTION LINKS

J5

POST-FADE

J4

PRE-FADE

POST-TRIM

J6

J9
J10

+48V

INPUT

DIRECT OUT

STEREO CHANNEL

+

L

INPUT A

R

L

INPUT B

R

-

GAIN

+

-

+

-

GAIN

+

-

FILTER

FREQ

(AUX1 ONLY)

ON

ON

PRE-FADE

POST-FADE

HPF IN

AUX5

SEND

AUX1

AUX2

AUX 1

AUX 2

SOURCE

MONO L

+

MONO R

L
R
M
L
R
M

PRE

AUX6

AUX7

AUX8 AUX5 AUX6 AUX7 AUX8

INSERT

PRE

AUX3

RETURN

AUX4

AUX 3

PAFL

PFL

L

+

R

+

MIX

GROUP
ASSIGN

1-2

3-4

5-6

7-8

L AFL

R AFL

L MIX
R MIX
C MIX

GRP 1
GRP 2

GRP 3
GRP 4

GRP 5
GRP 6

GRP 7
GRP 8

PAFL

PFL

L

+

R

+

MAIN

MIX

GROUP
ASSIGN

1-2

3-4

5-6

7-8

L AFL

R AFL

L MIX
R MIX
C MIX

GRP 1
GRP 2

GRP 3
GRP 4

GRP 5
GRP 6

GRP 7
GRP 8

+

-

LF LM HF

4 BAND EQUALISER

HM

EQ IN

METER

PEAK

PRE-INSERT

VCA

PRE-FADE AUX
OPTION LINKS

POST-MUTE

POST-EQ

PRE-EQ

J3

J2

J1

FADER

MUTE

J7

VCA GROUPS

MUTE GROUPS
SNAPSHOTS

PAN

L RLRC

J8

LCR+

PAFL LOGIC

C

BLEND

PRE

FADER

AUX12

PAN

VCA GROUPS

MUTE

J3

AUX12

PRE

STEREO

MUTE GROUPS

SNAPSHOTS

PRE

STEREO

AUX11

AUX12

BAL BLEND

L RLRC

+

+

PAFL LOGIC

C

LCR+

PRE

AUX5

AUX6

AUX7

AUX8

AUX9

AUX10

AUX11

STEREO

AUX9

+

PRE-FADE AUX
OPTION LINKS

POST-EQ

PRE-EQ

AUX11

AUX10

LEV 11-12

VCA

POST-MUTE

R=J2

L=J1

LEV 9-10

PAN

AUX 4

AUX 5

AUX 6

AUX 7

AUX 8

METER

PEAK

EQ IN

4 BAND EQUALISER

LF

LM HM HF

PRE

AUX9

PRE

AUX10

STEREO

AUX 5

AUX 6

AUX 7

AUX 8

OSC/NOISE/TALKBACK

PINK NOISE

1kHz OSC

Disable

TRIM

9-10 LEV

AUX 5

AUX 6

AUX 7

AUX 8

PAN

11-12 LEV

AUX9

AUX10

OSC/NOISE TO TB

DIM

TALK TO TB

+

-

MONITOR DIM

TB

+

TB MIC

+48V

TRIM

PAN

AUX11

INTERCOM

TALK TO INTERCOM

AUX12

INTERCOM IN/OUT

MONITOR DIM

SIDETONE

TRIM

LISTEN

-

+

TO PHONES

LAMP

CALL

10 ML4000 User Guide

GRP

AUX

L MIX

R MIX

MUTE

FADER

AFL LOGIC

L AFL

R AFL

FADER

MUTE

FADER

PEAK

+

-

METER

MUTE GROUPS

SNAPSHOTS

TB

TB ENABLE

MODE

(1-8 ONLY)

MIX

Press MODE to reverse GRP and AUX master control sections

GRP 1-8

AUX 9-12

INSERT

SEND

RETURN

AFL

AUX 1-8

MIX

TB

TB

LEFT

L MIX

RIGHT

R MIX

WEDGE mode

SEND

SEND

MASTER

INSERT

INSERT

RETURN

RETURN

PEAK

PEAK

+

-

+

-

AFL

MUTE GROUPS

SNAPSHOTS

AFL LOGIC

TO VU METER

POST-FADE

PRE-INSERT

PRE-INSERT

POST-FADE

L AFL

R AFL

BLEND

PAN

LCR+

L RLR C

BAL

BAL

L

BAL

R

BAL

MAIN

MIX

(1-8 ONLY)

GRP TO MTX

GRP OUT

AUX OUT

L

R

L MIX
R MIX
C MIX

LEFT

OUT

2TRK

OUT

RIGHT

OUT

MATRIX

GRP 1

GRP 2

GRP 3

GRP 4

GRP 5

GRP 6

GRP 7

GRP 8

TB

LEVEL

AFL LOGIC

L

R

C

TB ENABLE

AFL

L AFL

R AFL

C MIX

PFL

L AFL

R AFL

BAL

TB

C MIX

PFL MIX

L AFL MIX

R AFL MIX

MONITOR SOURCE

LR

L

R

C

L

2TRK

IN

R

C

CENTRE

WEDGE MON

MONITOR

C

+

+

+

-

+

-

SEND

PAFL LOGIC

INSERT

+

2TRK

RETURN

L

R

C

PEAK

AFL
PFL

FADER

MUTE

MUTE GROUPS

+

-

SNAPSHOTS

C METER

CENTRE

BAL

OUT

L METERS

GRP

R METERS

AUX

C METERS

MATRIX

METER SELECT

FROM INTERCOM

PFL

TRIM

TB DIM

WEDGE MON

PHONES

MONO

+

+

LOCAL

+

INPUT PAFL
OUTPUT AFL

MUTE

L

R

L

LOCAL
MONITOR

R

METERS 1-8

METERS 9-12

OUT

MATRIX

HEADPHONES

ML4000 User Guide 11

Technical Specifications

0dBu = 0.775 Vrms, +4dBu = 1.23 Vrms

Operating Levels

Channels......................................... 0dBu Headroom +21dB

Mix .................................................. -2dBu Headroom +23dB

Max XLR output .............................. +23dBu

Frequency Response Referred to 1kHz at +4dBu

Mic to main output (+40dB)............. 20Hz to 30kHz +0/-0.5dB

Line to main output (0dB)................ 20Hz to 30kHz +0/-0.5dB

Distortion @1kHz +14dBu

THD+noise ...................................... < 0.02%

CMRR Common mode rejection @1kHz

Mic (+40dB)..................................... > 80dB

Mic + Pad (0dB) .............................. > 50dB

Crosstalk Referred to driven channel @1kHz

Channel to channel ......................... < -95dB

Mute shutoff .................................... < -90dB

Fader shutoff................................... < -90dB

Noise Performance Measured rms 22Hz to 22kHz unweighted

Mic EIN with 150 ohm source ......... -128dB

Residual output noise ..................... < -98dBu

Mix noise, nothing routed................ < -94dBu

Mix noise, 24 channels routed ........ < -84dBu

Metering

Reading 0................. 0dBu at XLR outputs

LED meters .............. Peak reading, 3 colours

VU meters ................ Ave reading, Illuminated moving coil

Peak indicators ........ 5dB before clip, multi-point sensing

Input meters ............. 5 bar LED (signal, -6, 0, +6, peak)

Group mix meters .... 5 bar LED (signal, -6, 0, +6, peak)

Group/Mtx meters .... VU

L,R,C meters............ VU and 16 bar LED

Lamp Connectors x3

Connector ....................................... XLR-F 4pin

Rating.............................................. 12V 400mA max

Channel Filters

Slope ............................................... 12dB/oct high pass

Frequency ....................................... 20Hz to 400Hz

Mono Equaliser

HF................. +/-15dB, 2kHz to 20kHz shelf

HM................ +/-15dB, 500Hz to 15kHz bell, Q = 1 or 2

LM ................+/-15dB, 35Hz to 1kHz bell, Q = 1 or 2

LF .................+/-15dB, 20Hz to 200Hz shelf

Stereo Equaliser

HF................. +/-15dB, 12kHz shelf

HM................ +/-15dB, 2.5kHz bell

LM ................+/-15dB, 250Hz bell

LF .................+/-15dB, 60Hz shelf

Power Supply Model MPS14

Type ........................... External 2U rack or floor mount

Mains input................. 100-230V 50/60Hz universal input

Power consumption.... 500W

Full protection and fan cooling
Built-in combiner for redundant supply

Dimensions Width.............. Depth ...... .....Height

24 Channel 1196 (47”) ...... 781 (30.7”).... 282 (11.1”)

32 Channel 1451 (57”) ...... 781.......... .....282

40 Channel 1706 (67”) ...... 781.......... .....282

48 Channel 1961 (77”) ...... 781.......... .....282

Sidecar 831 (33”) ........ 781.......... .....282

MPS14 psu 483 (19”) ........ 260 (10.2”)....

Weights 24 Channel..... 53 kg (116 lbs)

32 Channel..... 65 kg (143 lbs)

40 Channel..... 75 kg (165 lbs)

48 Channel..... 87 kg (191 lbs)

24 Sidecar...... 40 kg (88 lbs)

MPS14 psu .... 2.5 kg (5 lbs)

INPUTS:

Mic (Pad out)................ XLR.................balanced, pin2+........ 2k ohm..............variable -60 to -10dBu ........ Max +11dBu

Mic (Pad in).................. ........................ ................................. >20k ohm..........variable -40 to +10dBu .......Max +31dBu

Stereo A ...................... TRS jack .........balanced, tip+........... >20k ohm..........variable -18 to +6dBu ......... Max +27dBu

Stereo B ...................... XLR................. balanced, pin2+ ........ >20k ohm..........variable –18 to +6dBu ........ Max +27dBu

2-Track......................... TRS jack .........balanced, tip+ .......... >20k ohm..........+4dBu................................. Max +25dBu

INSERTS:

Input send .................... TRS jack.........ground comp, tip+ .... <50 ohm............0dBu ................................... Max +21dBu

Input return................... TRS jack ......... balanced, tip+ ........... >20k ohm..........0dBu ................................... Max +21dBu

Output send ................. TRS jack.........ground comp, tip+ .... <50 ohm ............-2dBu .................................. Max +21dBu

Output return................ TRS jack ......... balanced, tip+........... >20k ohm..........-2dBu .................................. Max +21dBu

OUTPUTS:

L,R,C............................ XLR.................balanced, pin2+........ <75 ohm............0Bu ..................................... Max +23dBu

Grp/Aux 1-12................ XLR................. balanced, pin2+........ <75 ohm............0dBu ................................... Max +23dBu

Matrix 1-4 ..................... XLR................. balanced, pin2+ ........ <75 ohm............0dBu ................................... Max +23dBu

Direct out...................... TRS jack ......... ground comp, tip+ .... <50 ohm............0dBu ................................... Max +21dBu

2-Track......................... TRS jack .........ground comp, tip+ .... <50 ohm............0dBu ................................... Max +21dBu

Local Monitor ............... TRS jack.........ground comp, tip+ .... <50 ohm............0dBu ................................... Max +21dBu

Headphones................. TRS jack ......... tip left, ring right........ for stereo headphones >30 ohms

12 ML4000 User Guide

The Range

• ML4000-24 24 mono, 2 dual stereo inputs

• ML4000-32 32 mono, 2 dual stereo inputs

• ML4000-40 40 mono, 2 dual stereo inputs

• ML4000-48 48 mono, 2 dual stereo inputs

• ML4000-24B 20 mono, 6 dual stereo inputs

• ML4000-32B 28 mono, 6 dual stereo inputs

• ML4000-40B 36 mono, 6 dual stereo inputs

• ML4000-48B 44 mono, 6 dual stereo inputs

• ML4000-24SC 24 mono input sidecar

Installation Details

Weights 24 Channel 53 kg (116 lbs)

32 Channel 65 kg (143 lbs)
40 Channel 75 kg (165 lbs)
48 Channel 87 kg (191 lbs)
24 Channel sidecar 40 kg (88 lbs)
MPS14 psu 2.5 kg (5 lbs)

• MPS14 2U power supply unit

• 002-583 2.8 metre DC power lead

• 002-584 0.5 metre DC combiner lead

• AP4314 ML4000 Console User Guide

• AP4373 ML4000 Sidecar User Guide

• AP3898 MPS14 User Guide

• AP4316 ML4000 Service Manual

• AL4061 Gooseneck lamp 18”

HEADPHONES SOCKET
UNDER ARMREST

130

ML4000-24SC = 831

LAMP SOCKETS

282

781

ML4000-24 = 1196
ML4000-32 = 1451
ML4000-40 = 1706
ML4000-48 = 1961

440

FC 76.2

482.6

90

Refer to the power supply user guide
for safety and installation instructions.

Heed all warnings printed in the user
guide and on the power unit.

263

REMOVABLE RACK EARS

2U HEIGHT

Refer to the sidecar user guide for
instructions on connecting the sidecar
expander to the console.

ML4000 User Guide 13

Connecting the Power Supply

CAUTION

AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR.

CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE FUSE
WITH SAME TYPE AND RATING. DISCONNE CT SUPPLY BEFORE CHANGING FUSE.
ATTENTION: REMPLACER LE FUSIBLE AVEC UN DES MEMES CARACTERISTIQUES.
COUPER L'ALIMENTATION AVANT DE CHANGER LE FUSIBLE.

T

T5A 250V

S/No

ML5000

DIRECT

DIRECT

OUT

OUT

INSERT

INSERT

SEND

SEND

RET

RET

IN

IN

CHASSIS
GROUND

DC POWER IN

RS232

DO NOT OBSTRUCT VENTILATION OPENINGS.
DO NOT OPEN. NO USER SERVICEABLE PARTS INSIDE.
THIS APPARATUS MUST BE E ARTHED BY THE POWER CORD.

WARNING: TO REDUC E THE RISK OF ELECTRIC SHOCK
DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.

MAINS INPUT

FUSE

47-63 Hz ~

500W MAX100V - 230V.AC

MADE IN ENGLAND

DIRECT

OUT

INSERT

SEND

RET

IN

The ML4000 console range is supplied with the
MPS14 power supply unit. A second MPS14 may

be connected through the first as a redundant
(backup) supply.

Before connecting please read the IMPORTANT
SAFETY INSTRUCTIONS printed at the front of this
user guide and the warnings printed on the rear of
the power supply. Also read the user guide
provided with the power supply. Heed all
instructions regarding the installation and ventilation
requirements of the unit.

Connecting Mains Power

Check that the correct mains lead with moulded
plug suitable for your territory has been supplied
with your console. The MPS14 accepts mains
voltages within the range 100-240V AC without the
need to change any fuses or settings.

Make sure that the IEC mains plug is pressed fully
into the MAINS INPUT socket.

MPS14

MPS14

Connecting the DC Cable

Plug the cable into the power supply DC POWER
OUT 1 socket. First align the locating lugs, press
the plug into the socket, and screw on the locking
ring to hold it firmly in place. Plug and secure the
other end into the console DC POWER IN socket.

If you are using a second ‘redundant’ supply as a
backup then connect the short cable to both power
supplies. Connect from the DC POWER OUT 1
socket on the backup supply to DC POWER OUT 2
on the main supply.

Turning the Console On or Off

First check that the mains and DC leads are
correctly plugged in and secured. Turn on the
power supply using its front panel mains switch.
The console must be connected to the power
supply before turning it on. Failure to do so will
result in the unit powering up in protect mode. Turn
off, connect the console, and turn on again.

To avoid loud pops in the speakers make sure that
the connected power amplifiers are turned off
before switching the console on or off.

WARNING: To avoid damage to the

speakers always switch the power amplifiers on
last and off first.

14 ML4000 User Guide

Earthing

The connection to earth (ground) in an audio system is important for two reasons:

SAFETY - To protect the operator from high voltage shock, and

1.

2.

AUDIO PERFORMANCE - To minimise the effect of earth (ground) loops

which result in audible hum and buzz, and to shield the audio signals from interference.

For safety it is important that all equipment earths are connected to mains earth so that
exposed metal parts are prevented from carrying high voltage which can injure or even
kill the operator. It is recommended that the engineer check the continuity of the safety
earth from all points in the system including microphone bodies, guitar strings,
connector cases, equipment panels and so on.

The same earth is also used to shield audio cables from external interference such as
the hum fields associated with power transformers, lighting dimmer buzz, and computer
radiation. Problems arise when the signal sees more than one path to mains earth. An
earth loop results causing current to flow between the different earth paths. This
condition is usually detected as a mains frequency audible hum or buzz.

To ensure safe and trouble-free operation we recommend the following:

Use a clean mains outlet for the audio system. Keep the audio

equipment mains feed separate from that powering ‘dirty’ equipment such as air
conditioning and lighting systems, motors and vending machines.

Use star point earthing. It is best to install a ‘star point’ system where the

individual earths to the equipment racks and equipment areas are separately run from a
solid central reference earth point.

Have your mains system checked by a qualified electrician. If the

supply earthing is solid to start with you are less likely to experience problems.

Do not remove the earth connection from the console mains plug.

The console chassis is connected to mains earth through the power cable to ensure
your safety. Audio 0V is connected to the console chassis internally. If problems are
encountered with earth loops operate the audio ‘ground lift’ switch on the power supply
or connected equipment, or disconnect the cable screens at one end, usually at the
destination.

Avoid induced interference. To prevent interference pickup keep audio cables

away from mains power units, cables and distribution boards, motors, lighting and
computer cables and equipment, and any other heavy duty electrical equipment. Where
this cannot be avoided cross the audio and ‘dirty’ equipment cables at right angles to
minimise interference.

Use low impedance sources such as microphones and line level equipment

rated at 200 ohms or less to reduce susceptibility to interference. The console outputs
are designed to operate at very low impedance to minimise interference problems.

Use balanced connections where possible as these provide further

immunity by cancelling out interference that may be picked up on long cable runs. To
connect an unbalanced source to a balanced console input, link the cold input (XLR pin
3 or jack ring) to 0V earth (XLR pin 1 or jack sleeve) at the console. To connect a
balanced console output to an unbalanced destination, link the cold output to 0V earth at
the console.

Use good quality cables and connectors and check for correct wiring and

reliable solder joints. Allow sufficient cable loop to prevent damage through stretching.

If you are not sure ... Contact your service or local Allen & Heath agent for advice.

ML4000 User Guide 15

Rear Panel Connections

DIRECT

OUT

INSERT

SEND

RET

IN

INPUT

A

DIRECTDIRECT

OUT OUT OUT

INSERT

INSERT

SEND SEND

SEND

RET

RET

IN

IN

EXPANDER AUDIO

DIRECT

INSERT

DIRECT

DIRECT

INSERT

OUT OUT

OUT

INSERT

SEND

SEND

RET RET

RET

IN

OUT

INSERT

SEND

RET

RET

IN

IN

INPUT

B

IN. XLR input for mic or line level signals. Pin 2
hot. Phantom power is fed to pins 2 and 3 through
6k8 series resistors when the front panel +48V
switch is pressed.

WARNING: Do not connect

unbalanced sources or cables to the XLR inputs
when phantom power is selected. To avoid loud
clicks always turn the channel off by pressing
the MUTE switch when switching +48V on or off
and when plugging or unplugging microphones.

INSERT. Separate TRS jack sockets for send and

return. The insert is post-HPF and pre-EQ. It can
operate with both balanced or unbalanced line level
equipment. The channel signal path is interrupted
when you plug into the RETURN socket. You can
tap off the pre-EQ signal without interrupting the
signal path by plugging into the SEND socket.

DIRECT OUT. TRS jack providing the post-fade
channel signal as standard. You can reconfigure
the output as pre-fader or as post-fader with the
AUX 1 send control as a level trim by repositioning
internal jumper links. The output is ground
compensated.

EXPANDER AUDIO. Two 37-pin D-connectors to
connect the outputs of the expander sidecar into the
main console. These provide inputs to all the mix
busses and P/AFL system. They are balanced and
operate at –2dBu. Up to two sidecars may be
connected.

DIRECTDIRECT

INSERT

SEND

DIRECT

DIRECT

DIRECT

DIRECT

DIRECT

OUT

OUT

OUT

OUT

INSERT INSERT

ININ

EXPANDER LOGIC

SIDECAR

2 SIDECAR 1

INSERT INSERT

RETRET RET RET

OUT THRU IN

Select MIDI for normal operation !

SENDSENDSEND SEND

MIDI

DIRECT

OUT

OUT

INSERT INSERT

RETRET RETRET

RS232

SELECT

Serial No.

Note that the audio outputs of the first sidecar plugs
into the second. The output of the second presents
the combined mix to the main console.

The expander inputs conform to the Allen & Heath
SYS-LINK II standard. You can connect to a
console fitted with SYS-LINK I using special adapter
cables. Contact Allen & Heath for details.

EXPANDER LOGIC. 9-pin D-connectors to link
the expander sidecar and main console logic
system. Up to two sidecars may be connected.

MIDI. Three standard opto-isolated 5-pin sockets
for MIDI IN, OUT and THRU. The small slide switch
selects either the MIDI or RS232 connection. For
normal console operation it is recommended that
the switch is set to MIDI. The power up boot routine
is quicker in this position than RS232.

RS232. 9-pin D-connector to connect to the serial
port of a PC for loading new console operating
software or archiving the settings. To enable
RS232 set the slide switch to the RS232 position.
Set it back to the MIDI position when finished.

DC POWER IN. A heavy duty 7-pin connector with
locking ring for connecting to the console power
supply unit. A chassis ground terminal post is
provided for situations that require earth strapping
between equipment.

WARNING: Use only the DC power

cable provided with the console.

DIRECT

OUT

INSERT INSERT

CHASSIS
GROUND

DC POWER IN

DIRECT

OUT

SENDSENDSENDSEND

INININININ INININ

16 ML4000 User Guide

INTERCOM

INSERT

SEND

RETURN

INSERT INSERT

RSR

RL RL RL

INSERT

INSERT

INSERT

INSERT

INSERT

INSERT

INSERT

INSERT

INSERT

INSERT

S

S

S

S

S

S

S

S

S

R

R

R

R

R

R

A Division of Harman International Industries LimitedALLEN & HEATHMade in England by

R

S

R

R

INSERT

S

S

R

R

DIRECT

DIRECT

OUT

OUT

INSERT

INSERT

SEND

SEND

RET RET RET

DIRECT

INSERT

OUT

SEND

INININ

DIRECT

DIRECT

OUT

OUT OUT

INSERTINSERT

SEND

SEND

RET RET RET

DIRECT

INSERT

SEND

INININ

DIRECT

OUT

INSERT

SEND

RET RET

DIRECT

INSERT

OUT

SEND

ININ

STEREO IN. Each provides two balanced stereo
inputs which can be selected independently or
mixed into the channel, INPUT A on TRS jacks,
INPUT B on XLR. These accept line level signals.

LOCAL MONITOR OUT. Ground compensated
stereo monitor output on TRS jacks. These can
connect to a stereo amplifier/speaker system for
local monitoring.

2-TRACK IN / OUT. Line level TRS jacks to
connect to a 2-track recorder such as MiniDisc, tape
or DAT. Connect OUT to the recorder input, and IN
to the recorder output. The connections are
balanced. Link ring (cold) to sleeve (ground) when
connecting to unbalanced equipment.

MAIN OUTPUTS. Line level balanced XLR outputs
for the L, R and C main mix. Pin 2 hot. These
outputs can provide up to +23dBu maximum and
are suited to driving line level equipment operating
at nominal 0dBu or +4dBu. The C output is
available as the engineers wedge monitor feed
when the front panel mode switch is selected.

INSERTS. Each of the 8 mix and 3 main outputs
has a pre master fader insert point. These provide
separate TRS jack sockets for send and return.
The mix signal path is interrupted when you plug
into the RETURN socket. You can tap off the pre­fade signal without interrupting the signal path by
plugging into the SEND socket.

INTERCOM. Female XLR socket for connecting
the console to a ClearCom compatible intercom
system. An intercom headset is not required as the
console headphones and talkback microphone are
used. A standard 2-core shielded mic cable is
suitable.

LAMP. 4-pin XLR for plugging in a gooseneck
lamp to illuminate the control surface. Three lamp
sockets are provided along the back of the
meterpod. The right angled Littlite type is
recommended. The 4-pin XLR prevents any
confusion with the 3-pin audio connections.

GRP / AUX / MATRIX OUTPUTS. Line level
balanced XLR outputs for Grp 1-8, Aux 1-12 and
Matrix 1-4. Pin 2 hot. These outputs can provide
up to +23dBu maximum and are suited to driving
line level equipment operating at nominal 0dBu or
+4dBu.

Note: The GRP and AUX output XLRs always
remain on their respective connectors regardless of
the setting of the front panel REVERSE switches.

ML4000 User Guide 17