Cloud MA40 Datasheet

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Cloud MA40 Datasheet | Manualzz
MA40 Mini Amplifier
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MA40 Front Panel
MA40 Rear Panel
General Description
The MA40 is a very compact mono amplifier designed for integration
into installed audio and AV systems where de-centralisation of
system components is advantageous. It is intended as an “install-andforget” component, and is small enough to be fitted into a wall or
ceiling void, or in any convenient location adjacent to a projector, flat
screen display or loudspeakers, for example. A simple set of controls
and configuration 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 fixed or mobile tour guide systems.
The MA40 can drive 40 W into a 4 ohm load when used with the
external 24 V mains PSU supplied with the amplifier, but it will operate
from any external DC supply of between 12 and 24 V, making it ideal
for installation on buses, trams, river boats, or anywhere an AC
mains supply may not be readily available. The maximum output
power is reduced with supply voltages below 18 V.
The power amplifier stage is fully protected against DC offset,
over-current, over- and under-voltage and is also thermally protected.
A switch-on delay function mutes the output during power-up and
power-down to protect loudspeakers.
On the rear panel, each line input has a preset control for gain,
while the mic input has both preset gain and LF and HF EQ controls.
A dedicated remote level control port is provided to permit the
output level to be controlled by a standard Cloud RL Series remote
control plate.
In common with most Cloud products, a Music Mute Input is
provided, which may permit compliance with local Fire Authority
regulations; the microphone input remains active when the
Music Mute is applied. A front panel MUTE LED illuminates if the
Music Mute function becomes active.
The MA40 is very energy-efficient* and draws very little power in
a quiescent state. A user-selectable automatic power-down function
puts the amplifier into an ultra-low-current standby mode after a
preset period with no signal. A bicolour front panel LED indicates
standby and active statuses.
*ENERGY STAR certification applied for.
The amplifier mixes two unbalanced stereo line inputs with a
balanced microphone input; the stereo inputs are summed to mono
internally (the music channel). LINE 1 can be set to have priority
over LINE 2 via a rear panel DIP switch to allow the connection of
message stores, etc.The mic input can be configured (by another DIP
switch) to automatically take priority over the line inputs when a mic
signal is present, allowing its use for announcements. 12 V phantom
power is available at the mic input, selectable by internal jumper.
Front panel controls are provided for MIC, LINE 1 and LINE 2 levels;
additionally there are LF and HF EQ controls for the music channel
which allow the amplifier’s response to be optimised to suit the
loudspeakers and acoustic environment. A PEAK LED illuminates
if the amplifier’s dynamic clip protection becomes active, and thus
clearly indicates the onset of distortion.
All Cloud products are exclusively designed in the UK.
Every Cloud product is exhaustively tested for electronic performance and sonic perfection in Sheffield, England.
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Key features
• Compact mono amplifier module for “install-and-forget”
situations
• Two (unbalanced) stereo line inputs with individual sensitivity
trims
• Electronically-balanced mic input with separate gain control
• Phantom power selectable by internal jumper
• Front panel control of music level and mic levels
• Front panel HF & LF EQ adjustments for music sources
• Rear panel HF & LF EQ adjustment for mic input
• Selectable MIC-over-LINE priority
• Selectable LINE 1-over-LINE 2 priority
• 40 W power amplifier
• Optional EQ cards available to suit various popular installation
loudspeakers
Block Diagram
• Remote level control port; compatible with Cloud RL Series
plates
• Music Mute input; selectable N/O or N/C
• 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, operates from 100 to 240 V AC
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System Example
Adding audio to digital signage with an MA40
Line level audio
DIGITAL SIGNAGE
SYSTEM
LINE 1
LINE 2
RL-1
Remote level
plate
Twin-and-screen cable
MA40
MIC IN
RL-1 PORT
SPEAKER
OUTPUT
MUSIC MUTE
POWER
INPUT
(Optional: from
Emergency
system)
2 x 8 ohm speakers in parallel
12 – 24 V DC
power supply
Video displays used in digital signage systems do not normally incorporate loudspeakers, and if they do, audio quality is frequently poor due to size
constraints.The system shown here uses an MA40 to improve the audio in a digital signage system.The compact size of the MA40 makes it practical
to attach it by some simple means to the rear of the displays themselves.
The audio feed from the signage system is connected to one of the line inputs. An RL-1 remote level control plate could be installed in a location
convenient to staff to permit easy adjustment of volume.
This is an example of a “install-and-forget” system; at the end of each day the MA40 would automatically enter its ultra-low power state once the
video/audio feed is stopped.
Two loudspeakers are shown, connected in parallel.
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Technical Specifications
Line inputs
Frequency Response
±1 dB, 20 Hz to 20 kHz
Distortion
<0.1 %
Sensitivity
-12 dBu to +8 dBu
Input Gain Control
20 dB range
Input Impedance
10 kohms (unbalanced)
Headroom
>12 dB
Noise
<-90 dB
Equalisation
LF: ±10 dB @ 50 Hz, HF: ±10 dB @ 10 kHz
Microphone input
Frequency Response
-3dB @ 120 Hz (filter) to 20 kHz ±1 dB
Distortion
<0.1%
Gain
10 dB to 50 dB
Input Impedance
>2 kohms (balanced)
Headroom
>12 dB
Noise
<-90 dB
Phantom Power
+12 V (internal jumper)
Output
Output Power
(1 kHz continuous sine wave)
40 W, DC input >18 V
General
Power Input
12 V to 24 V DC. (External 24 V AC adaptor supplied.)
Power consumption
47 W
External AC PSU adaptor
Universal type, 100 V to 240 V, 47 to 63 Hz
Amplifier protection
Fixed level signal limiter. Protection against DC, PSU overcurrent, amplifier overcurrent, over-temperature,
supply voltage under/over-voltage, Resettable internal breaker (no fuses)
Dimensions
(w x h x d)
Weight
MA40
MA40
Net
220 mm x 41 mm x 144.5 mm, 8.7” x 1.6” x 5.7”
Shipping
290 mm x 160 mm x 210 mm, 11.4” x 6.3” x 8.3”
Net
750 g
Shipping
1.0 kg
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Dimensions: MA40
179 mm
7.05”
41 mm
1.61”
220 mm
8.66”
200 mm
7.9”
25.4 mm
1”
10 mm
0.4”
144.3 mm
5.7”
73.5 mm
2.9”
10 mm
0.4”
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Performance Graphs
Precision
LineAudio
Attenuation
11/04/16 10:52:13
Line EQ
+10
+14
+0
+12
-10
+10
+8
-20
+6
-30
d
B
r
+4
-40
d
B
r
-50
+2
-0
-2
-60
-4
-70
-6
-8
-80
-10
-90
-12
-14
-100
20
50
100
200
1k
500
2k
5k
10k
20k
20
Hz
50
100
200
500
1k
2k
5k
10k
20k
Hz
Sweep
Trace
Color
Line Style
Thick
Data
Axis
1
3
1
1
Black
Black
Solid
Solid
4
4
Anlr.Level A
Anlr.Ampl
Left
Left
Precision
LineAudio
Frequency
Response (8 ohms)
Comment
11/04/16 10:36:20
Audio Precision
Microphone
Frequency Response
+10
11/04/16 14:49:58
+10
+5
+8
+0
+6
-5
-10
+4
-15
+2
d
B
r
-20
d
B
r
-0
-25
-30
-2
-35
-4
-40
-45
-6
-50
-8
-55
-10
20
50
100
200
500
2k
1k
5k
10k
-60
20
20k
50
100
200
500
Hz
Sweep
Trace
Color
Line Style
Thick
Data
Axis
1
1
Black
Solid
4
Anlr.Level A
Left
16
17
Comment
Power vs Supply Voltage
44
42
4Ω LOAD
THD+N <0.05% @ 1kHz
40
38
36
34
POWER OUTPUT (W)
32
30
28
26
24
22
20
18
16
14
12
10
12
13
14
15
1k
2k
5k
Hz
18
19
DC INPUT VOLTAGE (V)
20
21
22
23
24
Sweep
Trace
Color
Line Style
Thick
Data
Axis
1
1
Black
Solid
4
Anlr.Level A
Left
Comment
10k
20k
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Architect’s and Engineer’s Specification
The single channel amplifier shall have a low-impedance output able to deliver
40 W into a 4 ohm load. The output shall be via a plug-in screw terminal
connector.
The amplifier shall be equipped with two unbalanced stereo line inputs and
an electronically balanced microphone input; the line inputs shall be summed
internally to mono (the music channel), and mixed with the microphone input.
The front panel shall be fitted with a microphone level control, separate level
controls for each line input and HF and LF equalisation controls for the music
channel. Each of the three inputs shall have rear panel sensitivity controls; the
microphone input shall have in addition HF and LF equalisation controls: all
rear panel rotary controls shall be of the preset type. Phantom power shall
be available at the microphone input, selectable by an internal jumper. All input
connections shall be via plug-in screw terminal connectors. There shall be visual
indication on the front panel if any input signal activates the amplifier’s clip
protection.
The amplifier shall be compliant with the relevant provisions of EnergyStar®
Eligibility Criteria Ver. 3.0 for Audio-Video Products. In the absence of an input
signal, it shall automatically enter “standby” mode wherein the DC power
consumption shall be less than 1 W. It shall be possible to override this mode
by an internal jumper.
The amplifier shall be built in a robust steel housing suitable for installation in
unattended locations. Cooling shall be by natural convection. The amplifier shall
be supplied with an external 24 V DC power supply capable of operating on any
AC mains supply voltage from 100 V to 240 V. The maximum output power of
40 W shall be available when the amplifier is operated from a supply of 18 V or
higher. The power input connector shall be of the plug-in screw terminal type.
There shall be colour-coded visual indication of the amplifier’s power status
(i.e., active or standby modes) on the front panel.
The amplifier shall be the Cloud MA40. The optional remote control plate shall
be the Cloud RL-1 Series.
It shall be possible to configure the mixer to perform the following functions:
i) detection of a signal on the microphone input will automatically mute the
music signal, ii) detection of a signal on one line input will automatically override
the other. It shall be possible to select these configurations without removing
any part of the amplifier housing.
A control input shall be provided to permit the audio output level of the
amplifier to be adjusted from a remote location; an optional accessory shall
be available to facilitate this. The input connector shall be of the plug-in
screw-terminal type.
An external control input shall be provided on a plug-in screw terminal
connector to allow muting of the music channel by a fire alarm or other
external emergency system via isolated, ‘volt-free’ contacts, and this input shall
be configurable to respond to either a short or open external circuit. There
shall be visual indication of the mute input’s state on the front panel.
www.cloud.co.uk
Issue_1.2
www.cloudusa.pro
E&OE

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