Many loudspeaker systems incorporate PolySwitch devices for overcurrent protection. By tripping during high-current conditions and resetting when no longer needed, PolySwitch devices provide reliable protection without the nuisance and replacement costs associated with fuses. The Problem Today’s speakers are generally designed and sold independently of amplifiers. Thus, mismatches may occur, which can lead to damage. Also, the advent of digital recordings and compact discs places extra burdens on sound systems. Speaker damage can result from a number of factors, including the following situations: • High-power amplifiers used with low-power speakers may simply overdrive the speaker coils with excessive power during sustained high volume. • Low-power amplifiers may be overdriven so that clipping occurs. This causes an upward frequency shift of power that can overload the tweeter. This problem is especially common with the wide dynamic ranges found on compac
