The MA80 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 “installand-forget” 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 MA80 can drive 80 W into a 4 ohm load. The power amplifier stage is fully protected against DC offset and over-current, and is also thermally protected. A switch-on delay function mutes the output during power-up and power-down to protect loudspeakers. The amplifier mixes two unbalanced stereo line inputs with a balanced microphone input; the stereo inputs are summed to mono internally to form 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 in use and room acoustics. A PEAK LED illuminates if the amplifier’s dynamic clip protection becomes active, and thus clearly indicates the onset of distortion. On the rear panel, each line input has a preset control for gain, while the mic input has preset gain and LF and HF EQ controls. A dedicated remote level control port is provided to permit the music level to be controlled by a standard Cloud RL Series remote control plate A 65 Hz high-pass filter, selectable by internal jumper, precedes the output stage and is included to allow the MA80 to drive 100/70/25 V-line loudspeaker systems (via an external transformer). Provision is also made for an EQ card to be fitted to optimise the amplifier’s frequency response to suit various makes and models of installed sound loudspeakers. A balanced, auxiliary line output is provided to allow additional power amplifiers to be connected, to drive active loudspeakers, or for any other purpose. The signal available at this output is the same mix of mic and line inputs fed to the power amplifier stage, but by moving an internal jumper, the source point may be changed so that the front panel EQ controls are bypassed (though they will still affect the main output). 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. To assist the MA80 in meeting local installation regulations, an optional conduit adapter kit is available (Warepart CA947034), which may be retrofitted to the rear panel, replacing the IEC inlet connector* with a non-removable mains connection to the amplifier. This makes the MA80 suitable for permanent installation in ceilings or similar plenum spaces. The MA80 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 active status, and flashes red or green if a fault condition arises, the colour depending on the nature of the fault.
Cloud MA80 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 • 80 W (4 ohms) power amplifier • Optional EQ cards available to suit various popular installation loudspeakers • Electronically-balanced auxiliary output • Aux output source selectable pre- or post-EQ • 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) • Optional conduit adapter plate available: permits permanent mains connection • Less than 1 W power consumption in sleep mode • Convection cooled – silent in operation • Power requirements: 100 to 240 V AC, 50 to 60 Hz.
Cloud MA80 Specifications
Line Inputs Frequency Response ±1 dB, 20 Hz to 20 kHz THD+N <0.05% (1 kHz, full power, 22 kHz bandwidth) Sensitivity -12 dBu (195 mV) to +8 dBu (2.0 V) Input Gain Control 20 dB range Input Impedance 47 kohms Headroom 16 dB Noise <-95 dB Music Equalisation LF: ±10 dB @ 50 Hz, HF: ±10 dB @ 10 kHz Microphone Input Frequency Response -3 dB @ 100 Hz (filter) to 20 kHz +/-1 dB THD+N <0.05% (1 kHz, full power, 22 kHz bandwidth) Gain 10 dB to 50 dB Input Impedance 2.7 kohms (balanced) Headroom 16 dB Noise EIN: -127 dB (22 kHz bandwidth, Rs = 150 ohms) Phantom Power +12 V (internal jumper) Mic Equalisation LF: ±12 dB @ 100 Hz, HF: ±12 dB @ 5 kHz Main Output Output Power (1 kHz continuous sine wave) 80 W into 4 ohms, 1 kHz continuous sine wave High Pass Filter -3 dB @ 65 Hz (selectable by internal jumper) Auxiliary Output Max output level 0 dBu (0.775 Vrms)
