Recording Handbook - Hol.gr

Michael Parrott writes:
"Note that EQ does not tend to make extreme changes in signal levels;
instead, it can be used to reduce or increase the prominence of
certain frequencies in the signal, which in turn reduces or increases
the audible prominence of certain portions of a track or mix. If you
get a chance to experiment, listen to what happens when you boost the
5 KHz range in an evenly-mixed guitar track; the guitar should become
more prominent in the mix without having significantly changed it's
signal level."
Different types of EQ:
(1) Parametric EQ (also "sweepable EQ")
A form of EQ which affects broad sections, or bands, of frequencies in
an audio signal. May be found as either two controls (Low and High),
three controls (Low, Mid, and High), or four controls (Low, Mid, Mid
Freq, and High). They tend to affect frequencies in the following
ways:
Low: Boosts or cuts frequencies in the low (bass) half of the audible
frequency spectrum (20 Hz - 1 KHz). A "shelving" control, it tends to
make more extreme changes at very low frequencies (20 Hz) and less
extreme changes at higher frequencies (1 KHz).
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