Processing
Parametric refers to a type of equaliser that provides continuous control over three key parameters — frequency, bandwidth (Q), and gain — for each filter band. It allows precise tonal shaping and problem correction across the audio spectrum.
A parametric equaliser is one of the most flexible and accurate tools in audio processing. Unlike fixed-frequency or graphic equalisers, a parametric EQ allows the engineer to select the centre frequency to be adjusted, control how wide or narrow the affected range is (the Q, or quality factor), and determine how much that range is boosted or cut (the gain). This precise control enables surgical adjustments as well as broad tonal shaping.
The frequency parameter sets the point in the spectrum to be modified — for example, targeting 3 kHz to enhance vocal presence or 80 Hz to reduce boominess in a bass track. The Q (bandwidth) defines how many neighbouring frequencies are affected: a low Q value covers a wide range for gentle tone shaping, while a high Q value isolates a narrow band for corrective filtering. The gain control determines how much the chosen band is increased or decreased in level, typically in decibels (dB).
Parametric equalisers may include one or more fully adjustable bands, with additional high-pass, low-pass, shelving, or notch filters for extended control. They are used extensively in both analogue and digital domains — from mixing consoles and outboard gear to software plug-ins — for tone correction, resonance control, and creative sound design.
Because of their precision, parametric equalisers are invaluable in professional audio work. They allow engineers to address specific frequency issues without affecting the rest of the spectrum, ensuring clarity, balance, and tonal accuracy in recordings and live sound.
