I've heard about them, but have no idea what the hell they are used for. There is probably a few people here that use them. So if you could, clue me in on there funtion.
thanks
-alex.
A parametric EQ has three parts. 1) a knob for boost/cut 2) a knob that sets the center frequency around which said boost or cut will control 3) a knob that sets the width of frequencies that are controled. The width is known as the "Q". (Not John DeLance from Star Trek). The "Q" could be as small as say 1/10 of and octave and as large as many octaves. So you can think of the "Q" as the curve.
A semi-parametric EQ just leaves off the "Q" control....the curve is predefined and unchangable and usually fairly broad....like an octave. You can find these kinds of controls on channel strips of better mixing consoles.