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Equalisation

Meaning to make equal it is intended to be applied to electronic signals which themselves convey sound information. Since electronic devices such as the Microphone or Pick-up will to some extent be more sensitive to some Frequencies than others, equalisation or EQ can compensate to 'bring up' frequencies which have been attenuated or 'back off' frequencies which have been accentuated.

Often the term EQ or equalisation is just applied to a set of frequency filters which can change the level of bands of frequencies for effect (enhance bass or treble for example).

Equalisers can be stand-alone or built in to other equipment such as a Mixing Desk. Instruments also often have an Equaliser built-in or performers may use an EQ pedal.