The MA80FT is a very compact mono amplifi er designed for integration into audio and AV systems where de-centralised installation is advantageous, and is suitable for use with either low impedance loudspeakers or 100/70/25 V-line systems. It is intended as an “install-and-forget” component, and is small enough to be fi tted into wall or ceiling voids or in any convenient location adjacent to projectors, fl at screen displays or loudspeakers. A simple set of controls and confi guration 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 fi xed or mobile tour guide systems. The MA80FT can drive low-impedance speakers down to a minimum total impedance of 4 ohms, or 100/70/25 V-line loudspeaker systems via the internally fi tted output transformer. The output power is 80 W in either case. The power amplifi er 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 amplifi er 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 confi gured by further DIP switches 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 MA80FT is 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 100/70/25 V-line PA/VA systems, the mic channel also has a high impedance input which allows the local subsystem being driven by the MA80FT to carry paging and/or emergency announcements made using the building’s main system. If the building’s existing system is used for background music, the high impedance connection can alternatively be routed to the LINE 2 input by moving an internal jumper: this permits the background music to be fed into the area covered by the MA80FT, with the advantage of local or remote level control for that area alone. 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 amplifi er’s response to be optimised to suit the loudspeakers in use and room acoustics. A PEAK LED illuminates if the amplifi er’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 balanced, auxiliary line output is provided to allow additional power amplifi ers 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 amplifi er 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). A particularly useful feature of the MA80FT is the Facility Port; this allows a remote input module from the Cloud LM-2 Series (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. The Facility Input is equipped with a fi xed threshold noise gate to eliminate background noise in the absence of an input signal. LM-2 modules also provide remote control of music level and LINE 1/LINE 2 selection. 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.
Cloud MA80FT Features
Compact mono amplifier module for “install-and-forget” situations • Suitable for use with either lo-Z speakers or 100/70/25 V-line systems (internal transformer fitted as standard): selectable by rear panel switch • Two (unbalanced) stereo line inputs with individual gain trims • Electronically-balanced mic input with separate gain and HF/LF EQ controls • Phantom power selectable by internal jumper • Front panel control of music level, mic level and music channel HF & LF EQ • MIC input configurable for direct connection to 100/70/25 V-line system: allows MA80FT to receive announcements made via main building PA/VA system • 100/70/25 V-line input can be routed to LINE 2 for integration with existing background music 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 and line input selection • Facility Port supports BT-1 Bluetooth input module • 80 W power amplifier • Electronically-balanced auxiliary output with source selectable pre- or post music EQ • Music Mute control input (N/O or N/C) for interface to emergency system • 65 Hz high-pass filter enabled when 100/70/25 V-line output is selected • 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 MA80FT 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 to +8 dBu (195 mV to 2.0 V) Input Gain Control 20 dB range Input Impedance 47 kohms Headroom 16 dB Noise <-90 dB rms (22 kHz bandwidth) Music Equalisation LF: ±10 dB @ 50 Hz, HF: ±10 dB @ 10 kHz Microphone Input Frequency Response -3 dB @ 100 Hz (fixed filter) to 20 kHz ±1 dB THD+N <0.05% @ 1 kHz, full power (22 kHz bandwidth) Gain -50 dBu to -10 dBu (2.45 mV to 245 mV) Input Impedance 3.3 kohms (balanced) Headroom 16 dB Noise (EIN) -127 dB, 22 Hz to 22 kHz (Rs = 150 ohms) Phantom Power 12 V (internal jumper) Mic Equalisation LF: ±10 dB @ 100 Hz, HF: ±10 dB @ 5 kHz Hi-Z Input Frequency Response Via Mic i/p -3 dB @ 100 Hz (fixed filter) to 20 kHz ±1 dB Via Line 2 i/p ±1 dB 20 Hz to 20 kHz Input Gain Control 10 dB to 20 dB Noise <88 dB rms (22 kHz bandwidth) Facility Input Frequency Response ±1 dB 20 Hz to 20 kHz Sensitivity 0.775 V (0 dBu) Input Impedance 10 kohms (balanced) Headroom 18 dB Noise Gate -60 dBu.
