Amplifier and Loudspeaker Protection
Categories of Amplifier Protection
The protection of solid-state amplifiers against overload is largely a matter of safeguarding them from load impedances that are too low and endanger the output devices, the most common and most severe condition being a short across the output. This must be distinguished from the casual use of the word ‘overload’ to mean excessive signal that causes clipping and audible distortion.
Overload protection is not the only safety precaution required. An equally vital requirement is DC offset protection – though here it is the loudspeaker load that is being protected from the amplifier, rather than the other way round.
Similarly, thermal protection is also required ...