User:Habibi 66

amplifier

What do power amplifiers do? Power amplifiers drive loudspeakers. After an audio signal has been mixed, equalized and otherwise processed at a standardized line level, it is sent to the power amplifier. Its job is to increase the power of the signal until we get the desired sound level from the loudspeakers, without otherwise altering the waveform of the signal.

A loudspeaker is an electromagnetic device that converts electric current into acoustic waves by making motions of a thin surface at audio frequencies.