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Loudspeakers maybe in danger of getting damaged by excessive excursion. Amplifiers in different parts of a mixer's signal path may saturate. Very often, our equipment is limited by its peak signal capacity.

Controlling the peak levels of a signal.

Thus, we could keep a singer's voice under control, compensating for higher levels at the microphone due to shouting or getting too close to the mic, and therefore making the voice's levels more even. Alternatively, abrupt or excessive compression maybe used as an effect, though this is normally used for recording applications and not for live sound. The human ear is very sensitive to energy variations, so changes should always be smooth and subtle so as not to be evident to the ear. We can express the energy of a signal mathematically as its RMS value (roughly its average value excluding the sign). The human ear detects energy changes on signals. NOTE : If you haven't already, do read Introduction to dynamics processors first.

This article will go through compressor controls and how to use them for a variety of applications.