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The MPA Series 240W Mixer Amplifier from Cloud USA provides a complete audio solution for houses of worship, retail outlets, hotels, licensed premises, and other spaces where music, announcements and/or flexible paging are required. It combines the functions of a four-channel microphone mixer with full paging facilities, a six-input music source selector, and a mono power amplifier in a single 2U unit.
The mixer-amplifier has 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 amplifier 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 multi-zone paging microphones. Alternatively, Mic 1 input may be configured to suit most OEM paging systems; paging is activated by a short-to-ground access connection, and Mic 1 may be configured 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 storage or similar device. A pre-announcement chime may also be enabled at installation. Mic 1 may be configured as a galvanically-isolated input for connection to (compatible) telephone systems, to permit paging to take place from any telephone extension.
A 70V-line transformer is fitted 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 amplifier to be used to drive low-impedance loudspeakers. A range of EQ cards to match the MPA Series amplifier to various installed-audio loudspeakers is available separately.
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 fixed to Line 6, and the music/mic mix may be adjusted independently. A separate, balanced line level pre-output is also provided to facilitate the connection of additional power amplifiers.
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.
With Standard Cloud Remote Control Plates: RL-1 Series (music level) and RSL-6 Series (music level and source selection)
2U 19" rack mounting unit
Provides amplification and simple control of music, mic sources, and paging in a single unit
Output power ratings of 240W
Integral 4-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 with 15V phantom power
Selectable 65 Hz hi-pass filter 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 configurable 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
Power amplifier protection circuitry
Power amplifier input limiter
Internal 70V line transformer fitted 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)