The possible amplifiers load are two transmitting lines with an opportunity of separate activation. Signals sources are microphone input (Input 1), line or tape recorder input (Input 2).
All inputs and outputs of power amplifiers are symmetric and has special voice filters for the best quality of voice signals, minimize the crosstalking and noise background. Besides, power amplifiers has circuitry to protect loudspeakers from an overload by low-frequency components of a signal. The amplifiers has four protection systems.
System 1 - The dynamic control of an output signal, which limits output power irrespective of an input level if total harmonic distortions are increasing more then 3 %.
System 2 - The active limiter of a current through the output circuit if short circuit of an active line will be happened at the maximum value of amplitude of an output signal.
System 3 - The control system of a load impedance. If the impedance significantly decreases the control system decrease output power up to the safe level.
System 4 - Two levels temperature control systems. The first level turn on a fan cooler for compulsory cooling of a heat-sink of an output circuit. If it is not enough and temperature is more then 69°C the second level of temperature control system will lower smoothly output power.
All systems automatically return the amplifier in a normal conditions after elimination of the failure reasons.
The simplicity of a design and modern element base has allowed to achieve high reliability at competitve cost of products.
Before sales all amplifiers are exposed to the life time test, after that all parameters are supervised again.
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The given models of amplifiers are basic. The delivery of an additional sets (microphones, loudspeakers, horn speakers) and updating at the request of the customer is possible. The update is executed at the request of the customer (changing of the input and output characteristics, remote control, changing of number of inputs (outputs) and output lines etc.). The manufacturer guarantees conformity of amplifiers to all parametars of specifications within 12 months after the moment of delivery. In the failure of amplifiers or their malfunction within a warranty period the manufacturer provide after-sales service including free charge replacement or repairing, and also makes delivery of components to amplifiers after a warranty period.
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