K-array KH7 User Manual

K-array KH7 User Manual Manual pdf 10 page image

KH7 Ver. 1.2107.4 PRoTeCTIon CIRCUITRYBoth the Power supply and the amplifier sections are equipped with several protection circuits.Power supply protections aim to isolate a faulty section in electrical power system from the rest ofthe device in order to prevent the propagation of the fault and limit device damages. They compriseovercurrent, overvoltage and thermal protections.Amplifier protections are triggered by audio signal current and voltage – by comparing input and output –and NTC (Negative Temperature Coefficient) thermistors. A Peak Current Shut Down and a TemperatureProtection Limiter protect the output stage.High frequency stationary signals, like steady sinusoidal signals – improperly referred as continuous orpermanent signals – with high amplitude tend to stress the amplifier section of the modules as well asthe loudspeaker’s voice coils. When a high frequency stationary loud signal is fed into the amplifier, adedicated limiter restricts its mean current depending on its level and frequency. The process is autoadaptive and frequency driven: at a higher frequency the limiter acts faster.