Parametric EQ
The same filter from Parts 4–6, reframed as a mixing tool. Boost or cut at specific frequencies with variable bandwidth.
Filters as Tools
In synthesis, filters remove frequencies: you carve a tone out of a harmonically rich oscillator. In mixing, the same math boosts or cuts. A parametric EQ is a filter you can tune precisely: choose a center frequency, decide how much to boost or cut, and set how wide the affected region should be.
Three Bands
A classic three-band parametric EQ uses three filter types. A low shelf boosts or cuts everything below a threshold (think bass control). A peaking filter targets a narrow band in the midrange. A high shelf boosts or cuts everything above a threshold (think treble). Each has three parameters: frequency (where it acts), gain (how much boost or cut in dB), and Q (how wide the affected region is).
Reading the Curve
The frequency response curve shows what the EQ does before you hear it. Flat means no change. A bump means boost; a dip means cut. The width of the bump or dip is controlled by Q. Learning to read this curve is the first step toward intentional mixing.
Try it: start with "Flat" on white noise, then try "Scooped Mids" to hear the classic metal guitar tone. Switch to saw to hear how EQ shapes musical content.