Electronic sirens are basically high-performance sound signal electronic amplifiers just like those in home sound systems. However, these sirens work with substantially higher outputs and specific demands are placed on them in terms of desired extreme reliability and different methods of their control. Control infrastructure must also be reliable and usually two independent control channels are required. The loudspeakers for these amplifiers are placed in specially-designed sound baffles and they play the signals stored in the siren’s digital memory or signals fed to the siren from external sources – a microphone, phone, radio station, common radio and television broadcasting, etc.

Country South Africa