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About Alesis Matica. Amplifiers Thank you for purchasing an Alesis Matica power amplifier, one of the most advanced and highest value amplifiers available. Your Alesis High Speed, Wide Bandwidth amplifier provides extremely accurate sonic quality as well as measured specifications, but its conservative design and careful attention to electronic protection means that it will continue to operate at top condition without special attention, year after year. Matica amplifiers use the newest generation of linear semiconductor devices for improved performance. Their high slew rate of 80 V/ms insures that they will not generate significant TIM (transient intermodulation) distortion. The outstanding signal to noise ratio (typically better than 103 dB, A weighted, below rated output) and very low harmonic distortion (typically below .009% midband) make them ideally suited for the most critical studio monitoring applications. These amplifiers, however, are in rugged, roadworthy packages which are of minimum size consistent with conservative electronic design principles. Their power transformers have unusually high current capability for their size, thus insuring both stable power output and minimum interference with adjacent equipment. The CoolSync. (patent pending) transistor cooling dynamically adjusts the rate of front to back airflow depending on the power density of the program material, thus anticipating the need for cooling rather than merely reacting to temperature. The airflow cools all components, not merely the output transistors. Detented level controls are on the front panel, where they can be easily adjusted if necessary. Both the power switch and the circuit breaker are on the front panel so that in case of problems, the breaker can be reset without requiring access to the rear of the amplifier. Clip lights for each channel indicate the onset of actual Matica 500/900 Reference Manual Introduction clipping, not just a designated output voltage which may not correspond to the clipping point if power line voltage is low. The rear panel inputs can be via gold plated 1/4" (6.3 mm) phone jacks, gold plated 3 pin XLR-type connectors or barrier screw terminals, all of which are standard equipment. Outputs are on five-way binding posts which can accept large diameter wire or 3/4" (19 mm) spaced dual banana plugs. A recessed rear panel switch allows easy selection of stereo or bridged monaural operating modes. Separate signal and chassis ground points are available to handle any grounding scheme. Matica amplifiers have high current output protection relays which disconnect the output in the event of overtemperature, DC offset, audio signals below 5 Hz on the output terminals or excessively low line voltage. When AC power is applied to the amplifier, the relay does not engage immediately; a 4.5 second delay allows the amplifier circuitry to stabilize and prevents turn-on transients from other equipment powering up during that time from being reproduced by the loudspeakers. The cooling fan is also momentarily exercised at high speed at turn-on. When AC power is turned off, the speaker protection relays immediately disconnect, thus keeping turn-off transients from reaching the speakers. Additional protection circuitry keeps RFI out of the audio circuits, assuring clean, stable operation in difficult environmental conditions. An aLink. 25-pin connector is provided for future expansion by the user. Among the planned accessories for attachment to this connector are outboard signal processors, electronic crossovers and remote controllers. Also planned are an internal module to allow soft turn-on and remote turn-on/turn-off; the internal module is for installation by qualified personnel. See your Alesis dealer for information on these options. Why Another Power Amplifier? Professional power amplifiers of today tend to fall into several groups. Those aimed at the performing musicianOs sound reinforcement needs are often designed for the highest possible power output at the lowest possible price. Those intended for portable sound reinforcement are frequently designed for minimum weight and size, while fixed reinforcement amplifiers are often made to fit a laundry list of requirements. In all too many of these situations, the sonic character of the amplifier is low on the list of design priorities. A professional amplifier must be reliable under all circumstances, of course, because peopleOs livelihoods and even their safety can depend on its proper operation. And yet, the primary purpose of any audio amplifier is reprodu...
Ce manuel est également adapté pour les modèles :Récepteur et amplificateur - Matica 900 (200.76 kb)