Speaker protection
Under speaker protection refers to components and circuits that the speaker protect against overload.
lightbulbs
Incandescent lamps are also used in the field of electroacoustics and public address technology. They are used here as speaker protection. Mostly festoon lamps are used for this purpose . The incandescent lamps are installed as a series resistor on the crossover or directly on the loudspeaker phase terminal. If the loudspeaker is overloaded, the internal resistance of the light bulbs increases. If the current increases even further, they start to glow. If the load continues to increase until it burns out, the power supply is interrupted and the loudspeaker concerned is muted. The compensation or energy conversion takes place in heat and light energy. If a strong protective function is required (e.g. for two-way systems from approx. 250 W), several incandescent lamps are switched in parallel. As a rule, the level of distortion caused by the use of incandescent lamps in public address systems / PA systems is justifiable. This method has been proven to be used in loudspeakers from the Bose company as well as in many loudspeakers from GDR production, especially in consumer goods loudspeakers from VEB Musikelektronik Geithain in the 1980s.
PTC resistors
PTC fuses are also used. PTC fuses are more suitable for the hi-fi area . It has been proven that PTC fuses are built into speakers from Canton and Nubert .
