Baxandall is the name given to a specific type of shelf equalization circuit, used for bass and treble controls.

Invented by British electronic engineer Peter Baxandall, this design is famous for its extremely smooth, wide, and musical sound.

Its main characteristics are:

• Smooth Curves: Unlike other EQs, the curves of a Baxandall are very gradual and with a very smooth slope.

• Interactivity: The "Q" (bandwidth) of the curve changes subtly as you increase or decrease the gain, which contributes to its natural sound.

Due to its pleasant and transparent sound, the Baxandall circuit has become a standard in tone controls for hi-fi equipment ("Bass" and "Treble") and is highly revered in studio mastering equalizers, where large tonal changes need to be made without introducing sonic artifacts.