Cloud MA40 User manual

MA40 Installation and User Guide v1.0
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MA40
Mini Amplier
Installation and User Guide

MA40 Installation and User Guide v1.0
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WARNING:
To reduce the risk of re or electric shock, do not expose this appliance to rain or
moisture.
WARNING:SHOCK HAZARD – DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE – NE PAS
OUVRIR
The lightning ash with the arrowhead symbol
within an equilateral triangle, is intended
to alert you to the presence of uninsulated
dangerous voltages within the product’s
enclosure that may be of sufcient 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.

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IMPORTANT SAFETY INSTRUCTIONS
1. Read these Instructions.
2. Keep these Instructions.
3. Heed all Warnings.
4. Follow all Instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves or
other apparatus (including ampliers) 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 t 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.
11. Only use attachments/accessories specied by the manufacturer.
12. Use only with the cart, stand, tripod, bracket or table specied by
the manufacturer or sold with the apparatus, when a cart is used,
use caution when moving the cart/apparatus 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 qualied 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 spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or
has been dropped.

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Do not expose the apparatus to dripping or splashing, and ensure that
no objects lled 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 l’objet.
The mains plug is used as the disconnect device and it should remain
readily accessible during intended use. In 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 l’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 sufcient magnitude to
constitute a risk of electric shock. The external wiring connected to
these terminals requires installation by an instructed person or the use
of pre-made leads or cords.

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Contents
IMPORTANT SAFETY INSTRUCTIONS ..........................................3
SAFETY INFORMATION ....................................................................7
Safety Notes regarding Installation........................................................................ 7
Conformities .............................................................................................................. 7
RoSH and WEEE declaration .............................................................................. 8
Safety Considerations and Information................................................................ 9
Mains Fuse ............................................................................................................. 9
Servicing .................................................................................................................. 9
OVERVIEW..........................................................................................10
Introduction.............................................................................................................. 10
Applicable Models................................................................................................... 10
MA40 main features................................................................................................ 11
What’s in the Box ................................................................................................... 11
BLOCK DIAGRAM .............................................................................12
FRONT PANEL DESCRIPTION .......................................................13
REAR PANEL DESCRIPTION...........................................................14
INSTALLATION..................................................................................15
Mechanical ................................................................................................................ 15
Ventilation ................................................................................................................. 16
Connections and adjustments.............................................................................. 17
Line inputs............................................................................................................. 17
Sensitivity & Gain Control.............................................................................. 18
Music Level and EQ control........................................................................... 18
Line 1 Priority.................................................................................................... 18
Mic inputs.............................................................................................................. 19
Mic gain adjustment.......................................................................................... 19
Microphone level control................................................................................ 20
Mic EQ ................................................................................................................ 20
Microphone priority......................................................................................... 20
Output ................................................................................................................... 20

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Remote Control.................................................................................................. 21
Connecting an RL-1 Series remote control plate ..................................... 22
Control of music source and level via external DC ................................. 22
Music Mute Input................................................................................................. 23
Auto Power Down.............................................................................................. 24
Loudspeaker EQ cards....................................................................................... 24
Installation Instructions ................................................................................... 24
APPENDIX ..........................................................................................25
PCB layout diagram................................................................................................. 25
Table of internal jumpers and default settings .............................................. 25
Summary of rear panel DIP switch functions ................................................... 26
EMC considerations ............................................................................................... 27
Earthing...................................................................................................................... 27
Technical specications .......................................................................................... 28

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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 ames.
• Do not block or restrict 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 symbol while
power is supplied to the unit.
• Do not perform any internal adjustments unless you are qualied to do so and
fully understand the hazards associated with mains-operated equipment.
• The unit has no user-serviceable parts. Refer servicing to qualied service
personnel.
• If the 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 a responsible manner.
Conformities
This product conforms to the following European EMC Standards:
BS EN 55103-1:2009
BS EN 55103-2:2009
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® Eligibility Criteria Ver 3.0 for Audio-Video products.

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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 on 1st 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 electronic
devices.
Customer participation is important to minimize 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 electronic equipment. Contact your local waste administration, waste
collection company or dealer.

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Safety Considerations and Information
The MA40 is powered by an external DC supply. A separate Power Supply Unit
(PSU) is supplied with the amplier. The PSU must be earthed. Ensure that the mains
power supply provides an effective earth connection using a three-wire termination.
Mains Fuse
The PSU is a sealed unit and contains no user-replaceable fuses. Mains over-current
protection is provided by the fuse in the AC mains plug, which should be rated at
5 A.
Servicing
The unit contains no user serviceable parts. Refer servicing to qualied service
personnel. Do not perform servicing unless you are qualied 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

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OVERVIEW
Introduction
The MA40 is a very compact mono amplier designed for integration into audio
and AV systems where de-centralised installation is advantageous. It is intended
as an “install-and-forget” component, and is small enough to be tted into wall or
ceiling voids or in any convenient location adjacent to projectors, at screen displays
or loudspeakers. A simple set of controls and conguration options makes it easy
to integrate into any audio system. It is highly suitable for use with in-store digital
signage, gallery and museum exhibits and xed or mobile tour guide systems.
The MA40 can deliver 40 W (mono) into a 4 ohm load. It has two unbalanced
stereo inputs for line level signals (typically music sources) and a balanced mic input
for announcements, etc. Front panel preset-type controls are provided for music
levels, music EQ and microphone level. There are also various preset adjustments
and conguration DIP switches on the rear panel, and jumpers mounted internally
on the main PCB. A Cloud RL Series remote level control plate can be wired to
the rear panel RL-1 connector; this connector also allows audio volume control by
a third-party control system (e.g., Crestron, AMX, etc.) using a DC voltage in the
range 0 – 10 V.
Applicable Models
This Installation Guide describes the installation and operation of the following
model only:
• Cloud MA40 40 W mono amplier for 4 ohm loudspeakers
NOTE: Amplier models MA40F, MA40T and MA40E are NOT covered by this
Guide, and when installing any of these models, reference should only be made to
the Guides specic to them.

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MA40 main features
• Two unbalanced stereo line inputs with individual sensitivity trims
• Electronically-balanced mic input with separate gain control
• 12 V phantom power selectable by internal jumper
• Front panel control of music and mic levels
• HF & LF EQ adjustments for music sources
• Rear panel HF & LF EQ for mic input
• Selectable MIC-over-LINE priority
• Selectable LINE 1-over-LINE 2 priority
• 40 W power amplier
• Remote volume control port: compatible with Cloud RL Series plates
• Music Mute control input (N/O or N/C) for interfacing to an emergency
system
• Selectable 65 Hz high-pass lter for use with 100/70/25 V line systems (via
external transformer)
• Optional EQ cards available to suit various popular installation loudspeakers
• Automatic power-down function (user-selectable)
• Less than 1 W power consumption in sleep mode
• Convection cooled – silent in operation.
• PSU meets US DoE Level VI energy requirements
• Power requirements: 12 to 24 V DC, 47 W
• Universal AC adaptor included (both models), operates from 100 to 240 V AC
Available Options:
• RL Series remote control plates for music volume
• 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:
• MA40 amplier
• 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

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BLOCK DIAGRAM

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FRONT PANEL DESCRIPTION
16 7 8 2 3 4 5
LEVEL controls:
1. MIC – sets volume of signal at the MIC input
2. LINE 1 – sets volume of signal at the LINE 1 input
3. LINE 2 – sets volume of signal at the LINE 2 input
EQ controls:
4. LF – LF EQ adjustment of music channel: +/-10 dB @ 100 Hz
5. HF – HF EQ adjustment of music channel: +/-10 dB @ 5 kHz
6. POWER – bi-colour LED: illuminates green when the amplier is active and
red when the amplier is in Automatic Power Down mode
7. MUTE – red LED: illuminates when the MUSIC MUTE function is active
8. PEAK – red LED: illuminates if the amplier’s dynamic clip protection becomes
active

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REAR PANEL DESCRIPTION
1 7 8 1192103
4
15 6
1. LINE 1 and LINE 2 – stereo line inputs for music sources (unbalanced)
2. GAIN – two preset level trim controls (+/-10 dB) for each line input
3. MIC INPUT – balanced mic input
4. GAIN – preset gain control for mic input; range +10 to +50 dB
5. LF – LF EQ adjustment of mic signal: +/-10 dB @ 100 Hz
6. HF – HF EQ adjustment of mic signal: +/-10 dB @ 5 kHz
7. RL-1 – for connecting an RL-1 Series remote volume control plate
8. SPEAKER OUTPUT – amplier output for low-impedance circuits
9. MUSIC MUTE – connect to external N/O or N/C contacts for remote
muting of music sources
10. SETTINGS – three-pole DIP switch for setting various amplier congurations:
SWITCH FUNCTION
1Enables LINE 1-over-LINE 2 priority
2Enables mic-over-music priority
3Enables RL-1 connector and disables front panel LINE level
controls
See “Summary of rear panel DIP switch functions” on page 26 in the Appendix
section for full details.
11. POWER INPUT – connect external DC power here: the MA40 requires 12
to 24 V at 2.5 A

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INSTALLATION
Mechanical
The compact size and light weight of the MA40 combined with its high energy
efciency allows it to be installed in almost any location. It can be easily placed in
ceiling or wall voids, or tted to the rear of display screens or loudspeaker cabinets.
The amplier has mounting anges with keyhole slots to permit it to be secured on
a horizontal or vertical at surface.
144.3 mm
5.7” 25.4 mm
1”
73.5 mm
2.9”
200 mm
7.9”
10 mm
0.4”
10 mm
0.4”
If using the MA40 in a free-standing situation, the self-adhesive feet (supplied with
the amplier) should be tted. The amplier should always be stood on a at surface.
Care should be exercised in selecting a location for a free-standing unit, which
should allow ventilation but be clear of any liquid or similar hazard.
MA40

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Ventilation
The amplier uses natural convection cooling, and care should be taken to
locate it where airow is unrestricted (e.g., not under ceiling insulation material).
Consideration should also be given to ease of access, should the operational
conguration or audio levels need adjustment after installation.
In free-standing installations, always t the rubber feet supplied, and do not stand
any other items on top of the unit.

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Connections and adjustments
Line inputs
The unit has two stereo line inputs 1, 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:
0V L R
LINE 1
LEFT CHANNEL
RIGHT CHANNEL
LINE 2
LEFT CHANNEL
RIGHT CHANNEL
AUDIO
SOURCE 1
AUDIO
SOURCE 2
The two line inputs are summed together internally, though Line input 1 can be
congured to have priority over Line input 2, see “Line 1 Priority” on page 18.

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Sensitivity & Gain Control
Each of the stereo line inputs has an input impedance of 10 kohms and a preset type
gain control on the rear panel adjacent to the input sockets 2. The gain controls
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 controls should be set so that the input
sources in use do not distort, and the front panel level controls 2 and 3 have a
useful range.
Music Level and EQ control
The front panel LINE 1 and LINE 2 controls 2 and 3 should be adjusted during
installation to set the volume of the audio sources. The line inputs are summed
post the level controls; equalisation can be applied using the front panel LF and HF
controls 4 and 5, which can apply a cut or boost of up to 10 dB at 50 Hz and
10 kHz respectively. Adjust the EQ controls 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.
If the line input levels are set too high, the amplier’s dynamic protection will activate
to prevent clipping and the front panel PEAK LED 8 will illuminate to indicate this.
Note that this LED also indicates an excessive mic signal level.
Line 1 Priority
When both line inputs are in use, one audio source can be given automatic priority
over the other by connecting it to Line 1 input and setting rear panel SETTINGS
DIP switch 1 (LINE 1 PRI) to ON. This is a useful facility when a Digital Sound
Store, emergency announcement system or similar source forms part of the audio
system.
When Line 1 Priority is enabled, the amplier will route the input signal at Line 2
normally until a signal is detected at Line 1’s input. When this happens, it switches
its music source automatically to Line 1. Once the signal at Line 1 stops (e.g., when
an announcement nishes), Line 2’s source will smoothly restore to its former level
over approx. 3 seconds.

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Mic inputs
The MA40 has a single microphone channel, enabling it to be used for announcements,
commentary, karaoke or any other purpose requiring a microphone. By default,
the mic channel is independent and is simply mixed with the summed line inputs,
but may be recongured so that it has automatic mic-over-line priority. It is then
compatible with paging microphones using zone selection by contact-closure
such as the Cloud PM range, including the PM1 single-zone microphone. See
page 20 for more details.
The mic input is a 3-pin 3.5 mm-pitch screw terminal connector. Use the wiring
shown below.
2 3
HOT
COLDSCREEN
1
MIC INPUT
The MA40’s microphone pre-amplier is an electronically balanced, transformer-
less design congured for optimum low noise performance. The input impedance is
greater than 2 kohms and is suitable for microphones in the 200 ohm to 600 ohm
range. The microphone signal path includes a xed high-pass lter. This attenuates
the response below 120 Hz, which helps to reduce the effects of microphone
handling noise.
12 V phantom power is available at the mic input, and is activated by setting internal
jumper J6 to the ON position. See page 25 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 if a
DC voltage is applied to them.
Mic gain adjustment
The mic input has a preset gain control 3 adjacent to the input connector. The gain
can be adjusted over a range of 40 dB, from 10 dB to 50 dB.

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Microphone level control
A front panel level control 1 is provided for the mic channel and this provides the
user with a means of adjusting the volume of the microphone. The rear panel gain
control 3 should be set at a level where distortion does not occur even when the
front panel level control is fully clockwise. If the mic level is set too high, the front-
panel PEAK LED 8 will illuminate. Note that this LED also indicates excessive
music level.
Mic EQ
The mic input has associated HF 5 and LF 6 EQ controls. These provide 10 dB of
cut or boost at 5 kHz and 100 Hz respectively and should be adjusted by listening to
achieve a clear mic sound. The purpose for which the mic input will be used should
be borne in mind when making adjustments.
Microphone priority
By default, the microphone channel is simply mixed with the music channel. It may
be recongured with SETTINGS DIP switch 2 to have automatic priority over
the music channel.
With SETTINGS DIP switch 2 – MIC PRI. (ON/OFF) - set to ON, a signal at
the mic input will automatically mute both line inputs; typically this conguration
will be desirable to give announcements or commentary priority over background
music. When the announcement is complete, the music channel fades back up to its
previous level.
When set ON, mic-over-line priority has priority over Line 1/Line 2 priority, meaning
that a microphone announcement will always be heard.
Output
The power amplier stage is fully protected against DC offset, over-current, over-
and under-voltage and is also thermally protected. Activation of the protection
circuitry shuts the power amplier stage down until the fault condition clears. All
protection conditions will automatically self-clear if the amplier is power-cycled.
A switch-on delay function mutes the output during power-up and power-down to
protect loudspeakers.
The MA40 will deliver its rated power of 40 W into a 4 ohm load when powered
by the external PSU supplied with the amplier. The maximum output power will