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Active EQs
The lters of an active network require external power which allows for an integration of
amplifying elements that allow for both boost and cut functions.
Active EQs dominate the market, and perhaps a good part of this is due to their user friendly
capacity to combine both boost and cut features into single controls. A very good active lter
designs can often offer very responsive characteristics with relatively little signal coloration
or alteration. But the operative word here is “can”—the sonic result of ltering comes under
the inuences of so many parameters that it is almost impossible to fullll any such claims
made categorically.
Parametric EQs
With a fully parametric EQ, all lter parameters are adjustable: The frequency, amplitude and
bandwidth of each lter can be adjusted by a user. The fully parametric EQ is therefore ideally
suited to working very specic or in very narrow limits at any desired frequency. There is also
the case of semi- or half-parametric lters, whose bandwidth is xed, usually at around two
octaves.
Graphic EQs
For working with the entire audible frequency range, there are available certain xed
frequency and bandwidth active lters. One can only alter the amplitude of each lter.
Because the designs of such machines originally employed fader controls (and often continue
to do so), these adjusted faders represent in a graphic curve the frequencies and amount of
alteration, and thus earned the name, graphic EQ.
The Basics of Frequency Filtering