Cloud mpa120, MPA240 User Manual
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CLOUD MPA Series Mixer-Ampliers
All Cloud products are exclusively designed in the UK.
Every Cloud product is exhaustively tested for electronic performance and sonic perfection in Shefeld, England.
General Description
The Cloud MPA Series is intended to provide a complete audio
solution for Houses of Worship, retail outlets, hotels, licensed
premises and other spaces where music, announcements and/or
exible paging are required. It combines the functions of a fourchannel microphone mixer with full paging facilities, a six-input music
source selector and a mono power amplier in a single 2U unit.
There are two models in the MPA range, which differ only in the
rated power of the amplier stage:
• MPA120 120 watts
• MPA240 240 watts
(all ratings are into 4 ohms)
The MPA mixer-ampliers have six unbalanced stereo line inputs
for music sources, and four balanced microphone inputs. Each
microphone input has its own rear panel sensitivity control and front
panel gain control, allowing multiple mics to be mixed together. Each
line input has a rear panel sensitivity control; the required music
source is selected by a front panel rotary switch and the volume is
also adjusted on the front panel. The selected music source is mixed
with the summed mic signals before being fed to the power amplier
stage.
The MPA Series is compatible with the Cloud PM1 single-zone paging
microphone, and may also be used for one of the zones supported by
the Cloud PM4/8/12/16/4-SA/8-SA multizone paging microphones.
Alternatively, Mic 1 input may be congured to suit most OEM paging
systems; paging is activated by a short-to-ground access connection,
and Mic 1 may be congured to have automatic priority over the
other mic inputs to prevent announcement clashes. Mic inputs may
be selected to have automatic priority over the selected music
source, and additionally, Line Input 6 may be set to have priority over
any other selected to facilitate connection of a digital sound store
or similar device. A pre-announcement chime may also be enabled at
installation. Mic 1 may be congured as a galvanically-isolated input
for connection to (compatible) telephone systems, to permit paging
to take place from any telephone extension.
A range of EQ cards to match the MPA Series to various popular
installed-audio loudspeakers is available.
A 100/70/25 V-line transformer is tted as standard, and the output
stage drives high-impedance line loudspeaker distribution systems
directly. An internal jumper allows the transformer to be disabled,
permitting the amplier to be used to drive low-impedance
loudspeakers.
In addition to the main output, there is an MOH/Utility Output
available as both an unbalanced line level signal and as a fully-isolated
output suitable for driving the Music On Hold input of a telephone
system. The music source at this output can follow the front panel
music source selection or be xed to Line 6, and the music/mic
mix may be adjusted independently. A separate, balanced line level
“Pre Out” output is also provided to facilitate the connection of
additional power ampliers.
Music level only, or music level and source selection may be
controlled remotely if wished, using standard Cloud remote control
plates.
In common with most Cloud products, a Music Mute Input is
provided, which may permit compliance with local Fire Authority
regulations; the microphone inputs remain active when the Music
Mute is applied.
MPA Series - rear panel view (MPA240 illustrated)
MPA Series - front panel view (MPA240 illustrated)
482.6 mm
19”
88 mm
3½” (2U)
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Block Diagram
• Provides amplication and simple control of music, mic sources
and paging in a single unit
• Available in two versions, with output power ratings of 120 or
240 W
• Integral four-channel microphone mixer with per-input
sensitivity adjustment
• Front panel controls for music source, music level and level of
each mic input
• Six (unbalanced) stereo line inputs with individual sensitivity
adjustment
• Four balanced mic inputs – 15 V phantom power available on
any or all
• Selectable 65 Hz hi-pass lter in each mic channel
• Separate microphone limiter circuit to prevent power stage
limiter from ducking music signal in the presence of high mic
levels
• Separate HF/LF EQ adjustments (rear panel) for mic signals and
music source
• Paging control on Mic 1 input via short-to-ground access
connection
• Mic 1 congurable for paging from telephone system
• Selectable VOX mic-over-music priority on all mic inputs
• Mic 1 may be selected to have priority over Mics 2 to 4
• Selectable LINE 6 priority with choice of release times
• Selectable pre-announcement chime
• Music Mute control input (N/O and N/C) for interface to an
emergency system
• Compatible with standard Cloud remote control plates:
RL-1 Series (music level) and RSL-6 Series (music level and
source selection)
• Power amplier protection circuitry
• Power amplier input limiter
• Internal 100/70/25 V-line transformer tted as standard
• Aux output from pre-amp (balanced, line level)
• MOH/Utility Output in line level and 600 ohm isolated formats
(for telephone system MOH inputs)
• Optional loudspeaker EQ cards available
• Forced-air cooling with variable speed control
• 2U 19” rack mounting unit
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In the example shown, the area has two xed mic points (at the two
lecterns), plus a radio mic to allow the presenter mobility. Any of the
music sources can be selected and the music level controlled from
the RSL-6 remote control plate at the back of the space.
Depending on the size of the area, either MPA model -
MPA120 (120 W) or MPA240 (240 W) - could be used. The system
is shown with multiple speakers being driven from the high-voltage
(100/70/25 V-line) output, though in a smaller space, fewer speakers
being driven directly from the low-impedance output might be more
practical.
System Example 1 - House of Worship
Input 1
Input 2
Input 3
Input 4
Input 5
Input 6
Mic 1
Access (Mic 1)
Mic 2
Mic 3
Output
Mic 4
Remote
Output
CD Player 1
CD Player 2
Organ
Keyboard
Receiver
MPA120/240
100 V-line output
Mic 1
Mic 2
Radio Mic 3
Lectern 1 Lectern 2
RSL-6
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