The MA40F and MA40T are very compact mono amplifiers designed for integration into audio and AV systems where de-centralised installation is advantageous. They are intended as “install-and-forget” components, and are small enough to be fitted into wall or ceiling voids or in any convenient location adjacent to projectors, flat screen displays or loudspeakers. A simple set of controls and configuration options makes them easy to integrate into any audio system. They are highly suitable for use with in-store digital signage, gallery and museum exhibits and fixed or mobile tour guide systems. The two models have identical feature sets, and differ only in dimensions and output capabilities: the MA40F can drive 40 W into a 4 ohm load (when used with the supplied PSU); the slightly larger MA40T is fitted with a line output transformer making it suitable for driving 100/70/25 V-line loudspeaker systems. An external 24 V mains PSU is supplied with each MA40F/T, though the MA40F is able to operate from any external DC supply of between 12 and 24 V. The maximum output power is reduced with supply voltages below 18 V. The ability to operate from a low DC supply voltage makes them ideal for installation on buses, trams or river boats, or anywhere an AC mains supply may not be readily available. The power amplifier stage is fully protected against DC offset, overcurrent, 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. The amplifiers mix two unbalanced stereo line inputs with a balanced microphone input; the stereo inputs are summed to mono internally. LINE 1 can be set to have priority over LINE 2 via a rear panel dipswitch to allow the connection of message stores, etc. The mic input can be configured by further dipswitches to function as a paging mic input, with the usual Cloud options for mic-over-music priority and paging control via either VOX or contact closure at the access port. The MA40F and MA40T are directly compatible with the Cloud PM1 single-zone paging mic. 12 V phantom power is available at the mic input, selectable by internal jumper. To allow integration into existing 100/70 V-line PA/VA systems, the paging input also has a high impedance input which allows the local subsystem being driven by the MA40F/T to carry paging and/or emergency announcements made using the building’s main system. Front panel controls are provided for MIC, LINE 1 and LINE 2 levels; additionally, each input has rear panel adjustments for gain. The front panel also has LF and HF EQ controls for the music channel; these 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. A particularly useful feature of the MA40F/MA40T is the Facility Port; this allows a remote input module from the Cloud LM-2 (for wired sources) or BT-1 Series (for Bluetooth wireless sources) to be connected via easy-to-install screened Cat 5 cable. Microphones, and/ or line sources - such as radio mics, DJ mixers, MP3 players, laptops or other audio sources - including Bluetooth-equipped laptops, tablets and smartphones – can then be connected locally, simplifying the use of the area for presentations where portable audio sources are in use. LM-2 modules also provide remote control of music level. RL and RSL Series control plates may also be connected to the MA40F/MA40T, to remotely control music level and music level and source selection respectively. 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. The MA40F and MA40T are very energy-efficient* and draw very little power in a quiescent state. A user-selectable automatic powerdown function puts the module into an ultra-low-current standby mode after a preset period with no signal. A bicolour front panel LED indicates standby and active statuses.
Cloud MA40F Features
Compact mono amplifier modules 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 • HF & LF EQ adjustments for music sources • MIC input configurable for direct connection to 100/70 V-line system: allows MA40F/T to receive announcements from main building PA/VA system • MIC input can be used with paging mics • Paging configurable as automatic voice-over-music (VOX mode) or contact closure via access port • Selectable LINE 1-over-LINE 2 priority • Facility port for connection of LM-2 remote mic/line input module via screened Cat 5 cable; also allows remote control of music level • 40 W power amplifier • Two versions available: MA40F with low-impedance output, MA40T with internal transformer for driving 100/70/25 V-line systems • Music Mute control input (N/O or N/C) for interface to emergency system • Selectable 65 Hz high-pass filter for use with 100/70/25 V-line systems • 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: • MA40F: 12 to 24 V DC, 47 W • MA40T: 24 V DC, 47 W • Universal AC adaptor included (both models), operates from 100 to 240 V AC.
Could MA40F Specifications
Line inputs Frequency Response ±1 dB, 20 Hz to 20 kHz Distortion <0.1 % Sensitivity 0.2 V (-12 dBu) to 1.95 V (+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 Facility input Input Impedance 10 kohms (balanced) Sensitivity 0.775 V (0 dBu) 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 >21 V
