Cloud MA40F, MA40T Installation And User Manual

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Installation and User Guide

MA40F/MA40T Installation and User Guide vl.O

WARNING:

To reduce the risk of fire or electric shock, do not expose this appliance to rain or
moisture.

A

WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS:RISQUE DE CHOC ELECTRIQUE - NE PAS

OUVRIR

The lightning flash with the arrowhead symbol
within an equilateral triangle, is intended
to alert you to the presence of uninsulated

dangerous voltages within the product's
enelosure that may be of sufficient magnitude

to constitute a risk of electric shock.

The exclamation point within an equilateral
triangle is intended to alert the user to
the presence of important operating and

maintenance (servicing) instructions in the
literature accompanying the appliance.

2 MA40F/MA40T Installation and User Guide vl.O

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IMPORTANT SAFETY INSTRUCTIONS

I. Read these Instructions.

2. Keep these Instructions.

3. Heed allWarnings.

4. Follow all Instructions.

s.

Do not use this apparatus near water.

6. Clean only with a dry cloth.

7. Do not bleek any ventilation openings. Install in accordance with the

manufacturer's instructions.

8. Do not install near any heat

sourees

such as radiators, heat registers, stoves or

other apparatus (including amplifiers) that produce heat.

9. Do not defeat the safety purpose of the polarized or grounding - type plug.A
polarized plug has two blades with one wider than the other.A grounding type
plug has two blades and a third grounding prong. The wide blade or the third
prong are provided for your safety.When the provided plug does not fit into

your outlet, consult an electrician for replacement of the obsolete outlet.

10.

Protect the power cord from being walked on or pinched particularly at plugs,

convenience receptacles, and the point where they exit from the apparatus.

I I. Only use attachments/accessories specified by the manufacturer.

12.

®

-

Use only with the cart, stand, tripod, bracket or table specified by
the manufacturer or sold with the apparatus, when a cart is used,
use caution when moving the cartlapparatus combination to avoid

injury from tip-over.

13.

Unplug this apparatus during lightning storms or when unused for long periods

of time.

14.

Refer all servicing to qualified service personnel. Servicing is required when the
apparatus has been damaged in any way, such as power-supply cord or plug is
damaged, liquid has been spilied or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or
has been dropped.

MA40F/MA40TInstallation and User Guide vl.O 3

A

Do not expose the apparatus to dripping or splashing, and ensure that

.a

no objects filled with water, such as vases, are placed on the apparatus.

L'appareil ne doit pas être exposé aux écoulements ou aux éclaboussures et aucun

objet ne contenant de liquide, tel qu'un vase, ne doit être placé sur I'objet.

The mains plug is used as the disconnect device and it should remain

readily accessible during intended use.ln order to isolate the apparatus
from the mains, the mains plug should be completely removed from the
mains outlet socket.

La prise du secteur ne doit pas être obstruée ou doit être facilement accessible
pendant son utilisation. Pour être complètement déconnecté de I'alimentation
d'entrée, la prise doit être débranchée du secteur.

Terminals marked with the ~ symbol may use Class 2 Wiring, but
voltages at these terminals may be of sufficient magnitude to
constitute a risk of electric shock. The external wiring connected to
these terminals requires installation byan instructed person or the use
of pre-made leads or cords.

4 MA40F/MA40T Installation and User Guide vl.O

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Contents

IMPORTANT SAFETY INSTRUCTIONS

3

SAFETY INFORMATION

7

SafetyNotes regarding Installation 7
Conformities 7

RoSHandWEEE declaration 8

SafetyConsiderations and Information 9

Mains Fuse 9
Servicing 9

OVERVIEW 10

Introduction 10
Applicable Models 10
MA40F/MA40T mainfeatures I I
What's in the Box 12

BLOCK DIAGRAM

13

FRONT PANEL DESCRIPTION

14
REAR PANEL DESCRIPTION 15
INSTALLATION 17

Mechanical 17
Ventilation 18
Connections and adjustments 19

Line inputs 19

Sensitivity&Gain Control 20
Music Leveland EQ control 20
Line I Priority 20

Mic inputs 21

Balancedinput 21

701

IOOVline input 22
Mic gainadjustment 23
Microphone levelcontrol 23
Pagingcontrol and mic priority 23

Output 25

Lo-Z output (MA40F only) 25
Connecting to

100170/25

V line systems(MA40T only) 25

Facility Port 26

MA40F/MA40TInstallation and User Guide vl.O 5

Connecting an LM-2 or BT-I 28
Connecting an RL or RSL Series remote control plate 30
Using the Facility Port as an auxiliary input 31
Control of music souree and level via external DC 31

Music Mute Input 33

Auto Power Down 34

Loudspeaker EQ cards 34

Installation Instructions 35

APPENDIX

36

PCB layout diagram 36

Table of internal jumpers and default settings 37
Summary of rear panel DIP switch functions 38
EMC considerations 40
Earthing 40
Technical specifications 41

6 MA40F/MA40T Installation and User Guide vl.O

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SAFETY INFORMATION

Safety Notes regarding Installation

Do not expose the unit to water or moisture.
Do not expose the unit to naked flames.
Do not block or restriet any air vent.
Do not operate the unit in ambient temperatures above 35°C.

Do not touch any part or terminal carrying the hazardous live symboltwhile

power is supplied to the unit.

Do not perform any internal adjustments unless you are qualified to do so and

fully understand the hazards associated with mains-operated equipment.
The unit has no user-serviceable parts. Refer servicing to qualified service

personnel.

Ifthe moulded plug is cut off the AC power lead for any reason, the discarded

plug is a potential hazard and should be disposed of in aresponsibie manner.

Conformities

This product conforms to the following European EMC Standards:

BS EN 55103-1:2009
BS EN 55103-2:2009

CE

This product has been tested for use in commercial and light industrial environments.

If the unit is used in controlled EMC environments, the urban outdoors, heavy
industrial environments or close to railways, transmitters, overhead power lines,

etc., the performance of the unit may be degraded.
The product conforms to the following European electrical safety standards:

BS EN 60065:2002 (+A2:2010)
UL60065

This product is compliant with the relevant provisions of:

Energy Star® EligibilityCriteria Ver 3.0 for Audio-Video products.

MA40F/MA40TInstallation and User Guide vl.O 7

RoSH and WEEE declaration

Cloud Electronics Limited manages its business and collaborates with its suppliers
to comply with the European Union restriction of the use of certain hazardous
substances in electrical and electronic equipment, RoSH Directive (2002/95/EC),
that came into force onIst July 2006, and similar restrictions in other jurisdictions.

The "crossed out wheelie bin" symbol on the product and represented

above is there to remind users of the obligation of selective collection
of waste. This label is applied to various products to indicate that the
product is not to be thrown away as unsorted municipal waste. At the

end of life,dispose of this product by returning it to the point of sale or
to your local municipal collection point for recycling of electric and electron ic
devices.

Customer partlcipation IS Important to rrururruze the potential effects on the
environment and human health that can result from hazardous substances that may
be contained in this product.

Please dispose of this product and its packaging in accordance with local and national
disposal regulations, including those governing the recovery and recycling of waste
electrical and electron ic equipment. Contact your local waste administration, waste
collection company or dealer.

8 MA40F/MA40T Installation and User Guide vl.O

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Safety Considerations and Information

The MA40F and MA40T are powered byan external DC supply.A separate Power
Supply Unit (PSU) is supplied with the amplifier. The PSU must be earthed. Ensure
that the mains power supply provides an effective earth conneetion using a three-
wire termination.

Mains Fuse

The PSU is a sealed unit and contains no user-replaceable fuses. Mains over-current
proteetion

is provided by the fuse in the AC mains plug, which should be rated at

SA.

Servicing

The unit contains no user serviceable parts. Refer servicing to qualified service
personnel. Do not perform servicing unless you are qualified to do so. Disconnect
the power cable from the unit before removing the top panel and do not make
any internal adjustments with the unit switched on. Only reassemble the unit using
either the original bolts/screws, or ones identical to the original parts

MA40F/MA40T Installation and User Guide vl.O 9

OVERVIEW

Introduction

The MA40F and MA40T are very compact mono amplifiers designed for integration

into audio and AV systems where de-centralised installation is advantageous. They
are intended as "install-and-forget" components, and are small enough to be fitted

into wall or ceiling voids or in any convenient location adjacent to projectors, flat
screen displays or loudspeakers. A simple set of controls and configuration options
makes them easy to integrate into any audio system.They are highly suitable for use
with in-store digital signage, gallery and museum exhibits and fixed or mobile tour
guide systems.

The MA40F can deliver 40W (mono) into a 4 ohm load, while the physically larger

MA40T includes an output transformer, enabling it to drive 100 V,70 V or 25 V

line loudspeaker systems. In all other respects, the two models are identical. There
are two unbalanced inputs for line level signals (typically music sources) and a
balanced mic input for paging/announcement use. An alternative mic input allows
the amplifier to be fed with paging/announcements from a 70/ IOOVline loudspeaker
system. Front panel preset-type controls are provided for music level, microphone

levels and music EQ. There are also various preset adjustments and configuration

DIP switches on the rear panel, and jumpers mounted internally on the main PCB.
A remote input module or remote level control can be wired to the amplifier's

Facility Port, which can also be used as an additional line input.

Applicable Models

This Installation Guide describes the installation and operation of the following
modeis:

• Cloud MA40F

• Cloud MA40T

40W mono amplifier for 4 ohm loudspeakers
40 W mono amplifier for 100/70125V line loudspeaker
systems

The two models differ in physical size, the MA40T being larger in order to
accommodate the internal line output transformer.Apart from the inclusion of this
transformer, the two models are essentially identical for the practical purposes of

installation and operation. Unless specifically stated otherwise, the information in
this Guide may be taken to apply to either model.

10 MA40F/MA40T Installation and User Guide vl.O

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NOTE:

Amplifier models MA40 and MA40E are NOT covered by this Guide, and
when installing either of these modeis, reference should only be made to the Guides
specific to them.

MA40F/MA40T main features

• Two unbalanced stereo line inputs with individual sensitivity trims

• Electronically-balanced mic input with separate gain control

• 12V phantom power selectable by internal jumper

• Front panel control of music level and mic levels

• HF&LF EQ adjustments for music sourees

• MIC input configurable for direct connection to I00/70 V line system: allows
MA40F/T to receive announcements from main building PAiVAsystem

• MIC input can be used with paging mics

• Paging configurable as automatic voice-over-music (VOX mode) or contact

closure via access port

• Selectable LlNE l-over-LiNE 2 priority

• Facility port for conneetion of LM-2 remote mic/line input module via

screened Cat 5 cable; also allows remote control of music level

• 40 W power amplifier

• Two versions available: MA40F with low-impedance output, MA40T with
internal transformer for driving 100/70/25 V line systems

• Music Mute control input (N/O or N/C) for interfacing to an emergency

system

• Selectable 65 Hz high-pass filter for use with 100/70125V line systems

• Optional EQ cards available to suit various popular installation loudspeakers

• Automatic power-down function (user-selectable)

• Less than IW power consumption in sleep mode

• Convection cooled - silent in operation.

• PSU meets US DoE LevelVI energy requirements

• Power requirements:

• MA40F: 12 to 24V DC, 60W

• MA40T: 24 V DC, 60 W

• Universal AC adaptor included (both modeis), operates from 100 to 240 VAC

MA40F/MA40TInstallation and User Guide vl.O I I

Available Options:

• RL Series remote control plates for music volume

• RSL Series remote control plates for Line I/Line 2 selection and music volume

• LM-2 remote mic/line input module with music volume control

• BT-I Bluetooth wireless audio input module

• EQ cards to match various popular installed-sound loudspeakers

What's in the Box

Please check the shipping carton for damage before opening. If there is damage,

please contact your Cloud agent and the shippers.
The packing carton should contain the following items:

• MA40F or MA40T amplifier

• External PSU (AC mains adaptor)

• IEC mains lead (AC cord) with moulded plug appropriate to the territory

• Set of mating plug-in screw-terminal connectors

• Set of four self-adhesive polyurethane feet

• This manual

12

MA40F/MA40T Installation and User Guide vl.O

I~I

111

I~

1~lIllllItlll

I ~

100V

MA40T

OUTPUT

FACILITY '

PORT

FRONT PANEL DESCRIPTION

~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~

LEVEL

controls:

I.

MIC -

sets volume of signal at the

PAGE/MIC

input

2.

LlNE I -

sets volume of signal at the

LlNE I

input

3.

LlNE 2 -

sets volume of signal at the

LlNE 2

input

EQ controls:

4.

LF -

LF

EQ adjustment of music channel: +/-10 dB @ 100 Hz

S.

HF -

HF

EQ adjustment of music channel: +/-10 dB @ 5 kHz

6.

POWER -

bi-colour LED: illuminates green when the amplifier is active and

red when the amplifier is inAutomatic Power Down mode

7.

MUTE -

red LED:illuminates when the MUSle MUTE function is active

8.

PEAK -

red LED:illuminates ifthe amplifier's dynamic clip proteetion becomes

active

14

MA40F/MA40T Installation and User Guide vl.O

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REAR PANEL DESCRIPTION

I~I~~II~=II~~I~~II ~~~~~~~~~~~~~~~~~~~~~

~~~~~~~~~~~~~~~~~~~~~

I.

LlNE

land

LlNE 2 -

stereo line inputs for music sourees (unbalanced)

2.

GAIN -

two preset level trim controls (+/-10 dB) for each line input

3.

MIC -

balanced mic input

4.

70/1

OOVLlNE -

alternative high-voltage input, for conneetion to 70/ IOOVline

speaker systems

5.

PAIOV-

external paging access contacts input for Mic input

6.

GAIN -

preset gain control for mic input; range + I0 to +50 dB

7.

FACILITY PORT -

RJ45 socket for conneetion of remote input/control

modules such as the LM-2 and BT-I; it is also possible to connect an RL-lor

RSL-6 remote control plate to this port

8.

SPEAKER OUTPUT

(MA40F only) - speaker output for low-impedance

circuits

9.

SPEAKER OUTPUT

(MA40T only) - for connection to 100/70125 V line

loudspeaker system

MA40F/MA40T Installation and User Guide vl.O

15

10.

MUSle MUTE -

conneet to external NfO or NfC contacts for remote

muting of music sourees

I I.

SETTINGS -

five-pole DIP switch for setting various amplifier configurations:

SWITCH FUNCTION

I MIC mode - configures MIC input for paging use
2 Enables mic-over-music priority
3 Selects paging priority mode - VOX or SW (SW=contact closure)

4 Enables LlNE l-over-LiNE 2 priority

5

Enables remote control functions of Facility Port and disables front

panel

LlNE

level controls

See also "Summary of rear panel DIP switch functions" on page 38 in the
Appendix section for full details.

12.

POWER INPUT -

conneet external DC power here:the MA40F requires 12

to 24 Vat 2.5 A; the MA40T requires 24 Vat 2.5 A.

16

MA40F/MA40T Installation and User Guide vl.O

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INSTALLATION

Mechanical

The compact size and light weight of the MA40F and MA40T combined with their
high energy efficiency allows them to be installed in almost any location. They can
be easily placed in ceiling or wall voids, or fitted to the rear of display screens or

loudspeaker cab inets.
Both models of amplifier have mounting flanges with keyhole slots to permit them

to be secured on a horizontal or vertical flat surface.

~.'~

.

~r-'--------------------------------------'-r~

~ 200mm------------------_.I

7.9"

MA40F

10

mm

0.4"

MA40F/MA40TInstallation and User Guide vl.O

17

10

mm

l

~r-r--------------------------------------------------------r-.~

~ 28Jmm ~

11.14"

10

mm

0.4··

MA40T

1

I

I

.,

If using the MA40F/MA40T in a free-standing situation, the self-adhesive feet

(supplied with each amplifier) should be fitted.The amplifier should always be stood
on a flat surface. Care should be exercised in selecting alocation for a free-standing
unit, which should allow ventilation but be clear of any liquid or similar hazard.

Ventilation

The amplifiers use natural convection cooling, and care should be taken to locate
them where airflow is unrestricted (e.g., not under ceiling insulation material).
Consideration should also be given to ease of access, should the operational
configuration or audio levels need adjustment after installation.

In free-standing installations, always fit the polyurethane feet supplied, and do not
stand any other items on top of the unit.

18

MA40F/MA40TInstallationand User Guide vl.O

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Connections and adjustments

Line inputs

The unit has two stereo line inputs

a,

each of which is mixed internally to mono;

these inputs are suitable for most music sources such as CD/DVD players, satellite

receivers and computer line outputs.

Both inputs are unbalanced and use 3-pin 3.5 mm-pitch screw terminal connectors.
The connectors should be wired as follows:

L

IGHTCHANNEL

AUDIO

SOURCE1

LEFTCHANNEL

LlNE2

LlNE 1

[

LEFTCHANNEL

AUDIO

SOURCE2

RIGHTCHANNEL

Unless a Cloud remote control plate or module such as the RSL-6 or LM-2 is in
use, the two line inputs are summed together internally, though Line input I can be
configured to have priority over Line input 2, see "Line I Priority" on page 20.

MA40F/MA40T Installation and User Guide vl.O

19

Sensitivity

&

Gain Control

Each of the stereo line inputs has an input impedance of 10kohms and a preset type
gain control on the rear panel adjacent to the input soekets

11.

The gain contrals
have a range of 20 dB allowing the input sensitivity to be varied from -12 dBu to
+8 dBu (0 dBu=0.775 Vrms). The gain contrals should be set so that the input
sou rees in use do not distort, and the front panel level contrals

0

and

0

have a

useful range.

Musie level and EQ eontrol

The front panel

LlNE land LlNE 2

contrals

0

and

0

should be adjusted during

installation to set the volume of the audio sou rees. The line inputs are summed

post the level controls; equalisation can be applied using the front panel

LF

and

HF

contrals • and

0,

which can apply a cut or boost of up to 10 dB at 50 Hz and

10kHz respectively.Adjust the EQ contrals to suit the audio programme material
being used, the speaker characteristics and the room acoustics. If the programme
material includes speech, the EQ should be adjusted for best intelligibility.

Ifthe line input levels are set too high,the amplifier's dynamic proteetion will activate

to prevent clipping and the front panel

PEAK

LED

0

will illuminate to indicate this.

Note that this LED also indicates an excessive mie signal level.

Line I Priority

Wh en both line inputs are in use, one audio souree can be given automatic priority
over the other by connecting it to Line I input and setting rear panel

SETTINGS

DIP switch 4

(LiNE I PRI)

to ON. This is a useful facility when a Digital Sound
Store, emergency announcement system or similar sou ree forms part of the audio
system.

Wh en Line I Priority is enabled, the amplifier will route the input signal at Line 2
normally until a signal is detected at Line I's input. When this happens, it switches

its music souree automatically to Line I. Once the signal at Line I stops (e.g., when
an announcement finishes), Line 2's souree will smoothly restore to its former level
over approx. 3 seconds.

20 MA40F/MA40T Installation and User Guide vl.O

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Mie inputs

The MA40F and MA40T have a single microphone channel, enabling them to be
used for paging or announcements. By default, the mic channel is independent and

is simply mixed with the summed line inputs. The mic channel can be reconfigured
so that it operates as a standard Cloud-type paging input, with selectable mic-over-

line priority and triggering by either contact closure or automatic signal detection.

It is then compatible with paging microphones using zone selection by contact-
closure such as the Cloud PM range, including the PMI single-zone microphone. See
page 23 for more details.

The mic channel has two separate physical inputs: a standard balanced input and a
high-level transformer-isolated input for connection to

701

100V line systems. Both

inputs, and the connections for paging access, are on the 2 x 5-pin 3.5 mm-pitch
screw terminal connector

PAGE/Mie INPUT.

The microphone signal path includes a fixed high-pass filter. This attenuates the

response below 120 Hz, which helps to reduce the effects of microphone handling
noise.

Balanced input

The MA40F/MA40T's microphone pre-amplifier is an electronically balanced,
transformer-Iess design configured for optimum low noise performance. The input

impedance isgreater than 2 kohms and is suitable for microphones inthe 200 ohm to
600 ohm range. The connector uses three pins of the lower 5-pin 3.5 mm-pitch
screw terminal type on the rear panel

11.

Use the wiring shown below.

70/100V LlNE

o

70

o

100

IDDDDDI

OV PA.,!,.

+

COLD

HOT

MA40F/MA40T Installation and User Guide vl.O

21

12V phantom power is available at the mic input, and is activated by setting internal

jumper J6 to the ON position. See page 36 and page 37 for further information

regarding the internal jumpers. Care should be taken to ensure that phantom power

is activated only when the microphone connected to the input requires it - i.e., a
capacitor or electret type; other types of microphones (such as dynamic) may be
damaged ifa DC voltage is applied to them.

70/1

OOVline input

The MA40F and MA40T are provided with an second, alternative input to the mic
channel, in the form of a transformer-isolated input which can be connected directly
to a 70 V line or 100 V line loudspeaker system. This input can be used to route
paging announcements from a building-wide PA or PAiVA system into the area
covered by the MA40F/T.

To use the high-voltage input, simply connect the loudspeaker system feed to either
the 70 V line or 100V line input, which use four pins of the upper S-pin section of
the connector, as shown below:

FEED FROM 100 V LlNE

SPEAKER SYSTEM

+

---------------------7\

+

P:::;--l

---------------------~ - I I
I I
I I
I I
I I
I I
I I
I I
I I

Alternative connection

for 70 V line system

shown in dashed lines

o

70 0 100
70/100V LlNE

OV

PA.,!, +

IDDDDDI

22

MA40F/MA40T Installation and User Guide vl.O

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Do not make any connections to the unused high-voltage input (70V or 100V).

Cloud recommend that no attempt is made to use both the balanced and high-
voltage inputs.

Miegain adjustment

The mic input has a preset gain controlll adjacent to the input connector. This is
effective whichever of the two mic inputs is in use. The gain can be adjusted over a

range of 40 dB, from 10 dB to 50 dB.

Mierophone level eontrol

A front panel level control

0

is provided for the mic channel and this provides the
user with a means of adjusting the volume of the microphone, or the announcements
from a PAIVA system if the 70/ 100 V line inputs are in use. The rear panel gain
controlll should be set at a level where distortion does not occur even when the
front panel level control is fully clockwise. Ifthe mic level is set too high, the front-
panel

PEAK

LED

0

will illuminate. Note that this LED also indicates excessive

music level.

Paging eontrol and mie priority

The microphone channel can be reconfigured to operate as a paging input with

SETTINGS

DIP switches

1,2

and

3.

For normal (non-paging) operation, all three switches should be OFF.The priority

functions operate as described below whichever of the two mic inputs is in use

(balanced or hi-voltage).

• Switch I -

PAGE/Mie MODE:

in the OFF position ('MIC), the mic input

operates as a standard microphone input. In this mode, DIP switch

3 (SW/

VOX)

is disabled. In the ON position ('PAGE'), the mic input operates as a

typical Cloud paging input and DIP switch 3 is enabled.ln PAGE mode, the

PagingAccess contacts will need to be shorted in order for the mic input to

become active.

MA40F/MA40TInstallation and User Guide vl.O 23

• Switch 2 -

PAGE/Mie PRI.(ON/OFF):

set to ON to enable Mic-over-Line
priority.This can be selected in both MIC and PAGE modes, i.e., regardless
of the setting of DIP switch I.The priority function will mute both LlNE and

FACILITYinputs. In MIC mode the priority trigger is alwaysVOX; in PAGE

mode the priority can be either SW orVOX type selected by DIP switch 3.

• Switch 3 -

SW/VOX:

this switch is only enabled when DIP switch I is set
to ON.When DIP switch 3 is OFF,SW priority triggering is selected: a short
circuit at the PagingAccess connector 11 will trigger priority (see below for
wiring details), muting any line input signals and enabling the mic input. When
set to ON,VOX mode is selected: a signal at the mic input will trigger priority.

In order forVOX mode to operate when DIP switch I is ON ('PAGE'), the

two pins of the PagingAccess connector must be shorted together.

The PagingAccess control input is on two pins

(PA

and

OV)

of the lower section of
the PAGE/MIC connector I1.TheAccess input provides compatibility with "contact-
closure" paging microphones.ln PAGE mode, the microphone input is muted as long
as the pins of the access connector are open-circuit. Wh en the pins are connected
together, the mic input becomes active.

70/100V LlNE

o

70 0 100

IDDDDDI

OV PA

-!-

+

COLD

CONTACT CLOSURE

(e.g., "Press-to-Talk"
switch on paging mie)
ACTIVATES PAGING

Balanced mie input

In eitherVOX or SW mode, the music signal isfaded back up after the announcement
is complete over a period of approx. 3 seconds.

24 MA40F/MA40T Installation and User Guide vl.O

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Output

The power amplifier stage is fully protected against

De

offset, over-current, over-
and under-voltage and is also thermally protected. Activation of the proteetion
circuitry shuts the power amplifier stage down until the fault condition clears.AII
proteetion

conditions will automatically self-clear if the amplifier is power-cycled.
A switch-on delay function mutes the output during power-up and power-down to
proteet

loudspeakers.

Lo-Z output (MA40F only)

The MA40F will deliver its rated power of 40 W into a 4 ohm load when powered
by the external

PSU

supplied with the amplifier.The maximum output power will be

reduced with lower supply voltages (please refer to MA40F/T datasheet for power

de-rating curve).
Wh en using multiple low-impedance loudspeakers (generally8ohms) with a single

amplifier, series and parallel wiring should be employed to produce a total load

impedance of not less than 4 ohms.

The low impedance output is available at the 2-pin 5 mm-pitch screw terminal

SPEAKER OUTPUT

connector on the rear panel

11.

Connecting to 100170/25V line systems (MA40T only)

The MA40T is fitted with an internal transformer enabling it to directly drive 100

Y,

70Vor 25Vline loudspeaker systems. The power amplifier stage is rated at 40 W

Loudspeakers intended for high-impedance line distribution systems usually have a

rotary switch which allows instalIers to select the power setting for each speaker
that produces the volume most appropriate for the location. InstalIers should
ensure that the total power settings of all loudspeakers connected to the MA40T in
this way does not exceed 40W

Wh en driving 100/70/25Vline loudspeaker systems there is a risk of transformer
core saturation at high levels and low frequencies, which can produce distortion.
To prevent this, the MA40F/MA40T's output stage is provided with a switchable
65

Hz

high-pass filter. We recommend that the filter is always enabled when the
amplifier is used with 100/75125Vline systems; note that Model MA40T is shipped
with the filter already enabled, but Model MA40F is shipped with the filter disabled.

If Model MA40F is used in conjunction with an external line transformer, the filter

should be enabled.

MA40F/MA40TInstallation and User Guide vl.O 25

The filter is enabled/disabled by moving internal PCB jumper J3. See "PCB layout
diagram" on page 36 for locations of PCB jumpers.

Facility Port

MA40F and MA40T amplifiers are provided with a

FACILITY PORT

in the form

of a rear panel RJ45 connector

11.

The primary use of the Facility Port is for the
connection of an LM-2 or BT-I remote active module, but it mayalso be used to
connect RL and RSLSeries remote control plates, or as a general-purpose auxiliary
balanced input (see "Using the Facility Port as an auxiliary input" on page 31 for
more information on this application).

The active modules operate from DC power supplied by the MA40F/T.The current
consumed byeach module is minimal and in the vast majority of installations there
will be no power supply issues.

IMPORTANT:

In order for the remote control functions on an LM-2 module or

an RLlRSLSeries plate to operate,

SETTINGS

DIP switch 5

(LOCALIREMOTE)

must be set OFF ('REMOTE'). This will disable the front panel LlNE land LlNE 2
controls, and control of line level and/or LlNE I/LlNE 2 selection will be available
from the remote module or plate. DIP switch 5 should be left set to LOCAL when
a BT-I is connected to the Facility Port.

The pinout of the Facility Port connector is given in the table on the following page.

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PIN

USE CatSCORE*

I Audio'cold' phase (-) Wh ite +

0

range

2

Audio 'hot' phase (+)

Orange

3 Priority YCA control

White + Green

4

+ ISY

Blue

5 OY

White + Blue

6 -ISY Green
7 Music level control (0 to 10Y)

White + Brown

8

Music source select control (0 to 10Y) Brown

GND GND ref for system music controls Connector shell

*

Standard wiringfor pre-made cables

RJ-45 PLUG (PIN SIOEI RJ-45 PLUG (LATCH SIOEI

RJ-45 SOCKET

MA40F/MA40T Installation and User Guide vl.O 27

Connecting an

LM-2

or

BT-I

Mie LEVEL MUSleLEVEL

~

5 6 7 5 6 7

3

4

'~' '~'

'~"

3- -9 3- -9

0

2" '10

2' ••••10

l' I l' I

I

(/)

0 0

Q

~ PR~~ITY

•••••••••

5 6 7

Cf)

'~'

~ @

3- -9

2' '10

Mie INPUT

LlNEINPUT

I

l' I

I

0

LM-2

LM-2

STATUS

0

','

@ @

PUSH-TO-PAIR •

2s

~

5s

BT-1 el»

BT-I

The LM-2 is an aetive input module whieh allows a mierophone and a stereo line

input in a remote loeation to be eonneeted to the MA40F or MA40T. The module

also includes the funetions of a Cloud RSL-6 Remote Control Plate, whieh allows

remote control of the MA40F/MA40T's musie level and selection of Line I or Line

2 as the musie souree.

28 MA40F/MA40T Installation and User Guide vl.O

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The BT-I is a Bluetooth remote audio input module which enables compatible
portable devices such as laptops, tab lets and smartphones to stream audio wirelessly
to the module, and thus into the audio system of the area where the module is

installed.

NOTE:

The MA40F and MA40T are only compatible with the BT-IFvariant of the

BT-I: do not attempt to connect variant BT-IE.

The LM-2 or BT-I should be connected to the MA40F/MA40T's

FACILITY PORT

using

screened

Cat 5 cable. (Note that as the cable carries analogue audio, only
screened Cat 5 should be used.) The LM-2 includes contrals for local music level
and source selection, the wiring for these functions being catered for on the Facility

Port. The maximum total Cat 5 cable length should not exceed 100 m.

LM-2:

The LM-2's upper PCB is fitted with an RJ45 connector labelled

OUTPUT.

Connect this to the

FACILITY PORT

using screened Cat 5 cable with screened

RJ45s at each end. Follow the colour coding shown in the table opposite. The metal
screening of the connectors should be bonded to the screen of the cable. Full details
can be found in the LM-2 Installation Guide.

Before the LM-2's music source and level contrals will operate, set

SETTINGS

DIP switch 5 to REMOTE (i.e., OFF. In this setting, the front panel

LlNE land

LlNE 2

contrals become inoperative. Positions 3 to 6 on the LM-2's Music Souree
switch have no function on the MA40F/MA40T; selecting these positions will
effectively mute both line inputs.

8ToI:

The BT-I has two PCBs "piggy-backed" onto the rear of the faceplate. The

RJ45 output connector (SKI) is located on the upper PCB.This should be connected

to the MA40F/MA40T's

FACILITY PORT

with

screened

Cat 5 cable and shielded

RJ45 plugs. Full details can be found in the BT-I Installation Guide.

MA40F/MA40T Installation and User Guide vl.O

29

Connecting an RL

or

RSL Series remote control plate

MA40F and MA40T amplifiers are also compatible with standard Cloud remote
control plates of the RSLSeries (music sou ree select and level),and RL Series (level
only). The MA40F and MA40T differ from most other Cloud produets in that they
do not have a dedicated 3-pin "Remote Control" port: RL and RSL Series plates
must instead be connected to the Facility Port g.This is most easily accomplished
by using screened Cat 5 cable between the MA40F/MA40T and the remote control
plate, but only connecting the one (or two) cores concerned with the remote
control functions (see page 27), plus the screen, to the plate.

RL-1 REMOTE LEVEL CONTROL WIRING

FACILITY PORT (RJ45)

RL-1

WHITE+BROWN

Screened Cat 5 cable

IGNORE ALL

OTHER CORES

RSL-6 REMOTE SOURCE & LEVEL CONTROL WIRING

WHITE+BROWN

__ BROWN

rw:=-----J--- ~

ScreenedC8t 5 cab!e

IGNOREALL

OTHERCORES

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Using the Facility Port as an auxiliary input

The Facility Port provides a balanced audio input. If a port is not connected to
a remote input module or remote control plate, it may be used as an additional,
balanced line input.The signal applied at the FacilityPort ismixed with the other inputs

(Line I, LlNE 2 and MIC), but has no independent level control on the amplifier; the
signal level must be adjusted at the source. If Mic-over-Line priority is enabled (see
"Paging control and mic priority" on page 23), a line input at the Facility Port will
be muted in the same way as LlNE land LlNE 2.

Connect an external balanced souree to the Facility Port as shown below:

BALANCED

OUTPUT (e.q., XLR)

~ -r-

FACILITY PORT (RJ45)

EL~~-===~~------------------~~ -HD

001(+)

coId(-)

Twin-core screened cable

An unbalanced souree mayalso be connected; the use of balancing transformers is

recommended.

Control of musie

souree

and level via external DC

It may be necessary in some installations to adjust the music level and select music
source from an external control system (e.g., Crestron, AMX, etc.). If the Facility

Port is not required for a remote input module or control plate, it may be used to

receive DC voltages from the external system to effect these adjustments.

Both music souree selection and level can be controlled with a DC voltage of 0 to

+IOY.Refer to the Facility Port pinout at page 27: music souree selection (restricted

to LlNE I/LiNE 2 selection in the case of the MA40F/MA40T) is controlled by
applying a DC voltage to pin 8, and music level by a DC voltage at pin 7.The 0 V

reference for both contrals is via the screen of the shielded RJ4Sconnector.

MA40F/MA40T Installation and User Guide vl.O

31

CONTROL

SYSTEM

FACLITYPORT

SOURCE CONTROL

t-....••

i------::v----ta

01

02

03

04

05

06

4k7 10k

MUSle SOURCE

SELECT

'>, ~

I---- ••.;-.;,~

+12V

/

CONECTOR

SHELL

ov

MUSICVCA

MA40F/MA40T

Music level

Music level may be varied over its full range by applying a

De

voltage of between

o

and+I0 V to pin 7 of the RJ45,with the 0 V reference connected to the RJ45

shield. OV on pin7corresponds to maximum level and+IOV will produce

60

dB of

attenuation.The rate of attenuation is approximately

165

mV/dB.

Note that there is an internal

4k7

"pull-up" resistor between pin7and the internal

+

12

V rail. If pin7is left "floating", this pull-up will result in full attenuation. The

output impedance of the control voltage

souree

should be low enough to overcome

the effect of this resistor.

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Music souree

LlNE I/LiNE 2 selection may be controlled by applying different DC voltages to pin
8, the OV reference being connected to the RJ45 shield.The table below summarises
the effect of various DC voltages at pin 8:

VOLTAGE (PIN

8)

LlNE SELECTION

< +4.3V

Both Line land Line 2 are deselected; this can be used as an
external mute function

+4.8V

Line 2 selected

+6.0V

Line I selected

> +8.5V

Both Line land Line 2 are selected and summed together

Note that there is an internal 10k "pull-up" resistor between pin 8 and the internal
+ 12V rail. If pin 8 is left "floating", this pull-up will cause 'OFF' to be selected. The
output impedance of the control voltage souree should be low enough to overcome
the effect of this resistor.

Music Mute Input

External muting of music may be commanded through the

MUSle MUTE

connector. National or LocalAuthority regulations governing installed audio systems
may require that normal programme material (i.e., music) should be muted in an
emergency, to ensure that any evacuation messages are clearly audible.When active,

it mutes all line inputs (including that at the Facility Port), leaving the microphone

inputs active.
The Music Mute input is on a 2-pin 5 mm-pitch screw-terminal connector.lt should

be connected to the appropriate alarm output on whichever building management
system registers the alarm (typically the Fire System). The alarm output must be
volt-free; if no such output is available, an intermediate relay or other isolation
device must be installed between the alarm output and the Music Mute input.

MA40F/MA40T Installation and User Guide vl.O 33

The Music Mute input can be set to operate on either normally open (N/O) or
normally closed

(N/C)

contacts via internal jumperJI (see "PCB layout diagram" on

page 36). The factory default setting is NIO, thus requiring a short-circuit to be
applied across the two pins of the connector for muting to occur.

REMOTE MUSle MUTE TERMINATIONS

MUSIC MUTE

INPUT

MUSIC MUTE

INPUT

NORMALLY OPEN (NO)

CONNECTION

NORMALLY CLOSED (NC)

CONNECTION

Auto Power Down

The MA40F and MA40T are extremely energy-efficient amplifiers, but can be made
even more so by enabling the Auto Power-Down feature. When active, the signal

level is constantly monitored and if no input signals are measured for

15

minutes
the amplifier enters a "Sleep" mode, minimising power consumption. If a signal is
detected while the channel is in this mode, the amplifier "wakes up" in less than

100 ms.

MA40F and MA40T amplifiers are shipped with the Auto Power Down function
disabled. It may be enabled by moving internal PCB jumper J5. See "PCB layout
diagram" on page 36 for details of jumper locations.

Loudspeaker EQ

cards

The MA40F and MA40T are compatible with single channelloudspeaker equalisation
modules. EQ modules are available from Cloud Electronics to suit several popular

ranges of installed sound loudspeakers; please check current module availability at
www.cloud.co.uk/accessories.

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Installation Instructions

Refer to the PCB layout diagram (see "PCB layout diagram" on page 36) for the

location of the EQ module connector and its associated bypass jumper J2.

To install an EQ module, proceed as follows:

I. Isolate the amplifier from its DC power source.

2. Remove the screws securing the top cover: there are two on the top and two

on each side. Remove the cover.

3. Remove jumper J2.We recommend "stowing" it on one of the header pins in

case it ever needs to be replaced.

4. Plug the loudspeaker equalisation module into its 12-pin connector CON I;

note that the connector has two notches on one side which engage with lugs
on the module's mating connector to ensure correct orientation.

S. Replace the top cover.

MA40F/MA40T Installation and User Guide vl.O 35

APPENDIX

PCB layout diagram

To access the internal PCB, disconnect the amplifier from its DC power souree and

remove the six screws securing the top cover; remove the cover.

EQ CARD SOCKET

OFF ON

-

J6

NOTTO SCALE.

ONLY PRIMARY COMPONENTS SHOWN

DO NOT

J4 FIT A JUMPER

HERE!

o

0

00

REAROF UNIT

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Table of internal jumpers and default settings

JUMPER

PURPOSE OPTIONS DEFAULT

JI

Musie Mute N/O or N/C N/O

J2

EQ eard bypass Present/absent Present

J3

65 Hz hi-pass filter ON/OFF

MA40F:OFF

I

MA40T:ON

J4

For faetory use only - do not fit a

Absent

jumper here

J5

Auto Power Down Present/absent Present

J6

+12V Mie

ON/OFF OFF

phantom power

MA40F/MA40T Installation and User Guide vl.O 37

Summary of rear panel DIP switch functions

JUMPER

POSITION FUNCTION

Both PAGE/MIC inputs function

OFF = Mie MODE

as a standard microphone input,

including GAIN and LEVEL

I

PAGE/MIC

controls.DIP switch 3 isdisabled.

MODE

Both PAGE/MICinputsfunction as

ON = PAGEMODE

a typical Cloud paginginput. DIP

switch 3 isenabled.

The mic signalis mixed with the

OFF = PRIORITY OFF

line inputs accordingto the front
panelLEVELcontrols.

The mic signalwill take priority
over the line inputs (includingthe

2

PAGE/MIC

FacilityPort),which will be muted

PRIORITY

while the mic is in use. Priority

ON = PRIORITYON

triggering will be determined

by the settings of DIP switches

I and 3: with switch I in PAGE
mode,priority triggering is set by
DIPswitch 3.

The PAand OVpins of the PAGE/

OFF=SW

MIC connector must be shorted

together to enablethe mic input
andmutethe line inputs.

A signal at the PAGE/MICinput

3 SWNOX

will trigger mic-over-line priority
and mute the line inputs.The PA

ON =VOX

and OV pins of the PAGE/MIC
connector must be permanently

shorted together for VOX

operation in PAGEmode (disabled

in MIC mode).

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4

LlNEI
PRIORITY

OFF=PRIORITY OFF

ON = PRIORITY ON

OFF = REMOTE

ON=LOCAL

LOCAL/
REMOTE

Note: default settings are in

BOLO

text.

5

In LOCAL mode (ref SWS), the
signals at LlNE land LlNE 2 are
mixed together.ln REMOTE mode,
LlNE I or LlNE 2 is selected by

the MUSIC SOURCE switch on
an RSL plate or LM-2 module
connected to the Facility Port.

A signal at LlNE I input has

priority over that at LlNE 2: LlNE
2 is automatically muted.

The two front panel LEVEL
controls (LiNE land LlNE 2) are

disabled. The summed line input
level is controlled by the level

control on the remote plate or

module connected at the Facility
Port. If an RSL Series plate or
LM-2 module is in use, the Music
Souree control can select either
LlNE land LlNE 2.

The levels of LlNE land LlNE 2

input signals are controlled by the

two front panel LEVEL controls.
The two inputs are mixed together.

MA40F/MA40T Installation and User Guide vl.O

39

EMC considerations

MA40F and MA40T amplifiers fully conform to the relevant electromagnetic
compatibility (EMC) standards and are technically weil behaved. You should
experience no problems interfacing units to other items of equipment and under
normal circumstances, no special precautions need to be taken. If the unit is to
be used in close proximity to potential sourees of HF disturbance such as high
power communication transmitters, radar stations and the like, it is suggested that

input signal leads be kept as short as possible.Always use balanced interconnections
wherever possible. We recommend that the MA40F/MA40T amplifier is not located

in close proximity to a high-power amplifier or similar item of equipment, which
may radiate astrong magnetic field from its power transformer.

Earthing

Wh en several mains powered units are connected together via their signal cab les,
there is a risk of one or more earth loops which may cause an audible hum on
the system even with the gain contrals set to minimum. The 0 V rail of an MA40F/

MA40T amplifier is directly coupled to the chassis ground. No interconnection
problems should be encountered, but ifthere is any hum or other extraneous noise
when source equipment is connected, the situation can generally be remedied by
observing the following guidelines:

I. Always connect sourees using balanced connections wherever possible. Note

th at, for EMC reasons, the cable screen should be connected at both ends.

2. Use audio isolating transformers (readily available from trade suppliers) at the

inputs if necessary. These will ensure that the amplifier is electrically isolated

from the source equipment.

3. The signal source units should be located as close as practical to the amplifier.
The metal housings of the various units should not be electrically connected.
Try to ensure that all interconnected units, including power amplifiers, are
connected to a common power source to ensure a common ground is provided.

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Technical specifications

LlNE INPUTS

Frequency Response ± I dB,20 Hz to 20 kHz
Distortion

<0.1 %
Sensitivity 0.2V (-12 dBu) to 1.95V (+8 dBu)
Input Gain Control 20 dB range
Input Impedance 10kohms (unbalanced)
Headroom

>12 dB
Noise

<-90 dB

Equalisation LF:±IO dB@ 50 Hz,HF:±IO dB@ 10 kHz

FACILITYINPUT

Input Impedance 10kohms (balanced)
Sensitivity 0.775 V (0 dBu)

MICROPHONEINPUT

Frequency Response -3dB @ 120 Hz (filter) to 20 kHz ± I dB
Distortion

<0.1%
Gain 10 dB to 50 dB
Input Impedance >2 kohms (balanced)
Headroom

>12 dB
Noise

<-90 dB
Phantom Power + 12V (internal jumper)

OUTPUT

Output Power (I kHz

40W,DC input>18V

continuous sine wave)

GENERAL

Power Input

MA40F: 12 to 24 V DC; MA40T: 24 V DC
Power Consumption 60W

External AC PSU

Universal type, IOOVto 240 V,47 to 63 Hz
adaptor

MA40F/MA40T Installation and User Guide vl.O

41

Fixed level signal limiter

Protection against De, PSU overcurrent, amplifier
Amplifier Protection overcurrent, over-temperature, supply voltage under/

over-voltage

Resettable internal breaker (no fuses)

Net

220 mm x 41 mm x 144.5 mm

8.7" x 1.6" x 5.7"

MA40F

Shipping

290 mm x 160 mm x 210 mm

Dimensions

I lA" x 6.3" x 8.3"

(w

x h x d)

Net

303 mm x 41 mm x 144.5 mm

I 1.9" x 1.6" x 5.7"

MA40T

Shipping

290 mm 160 mm x 380 mm

I lA" x 6.3" x 15"

Net 750 g

MA40F

Weight

Shipping 1.0 kg

Net 1.65 kg

MA40T

Shipping 1.8 kg

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MA40F/MA40T Installation and User Guide vl.O

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www.cloud.co.uk

MADEIN BRITAINII

www.cloudusa.pro