crossfader

A crossfader is a control found on many DJ mixers that blends audio from two input sources, typically labeled A and B. By sliding the control toward one side, the listener hears mostly that source; moving it toward the other side favors the opposite source. In the center position, the outputs are blended equally. Crossfaders enable smooth transitions between tracks and are also central to scratching and other turntablism techniques.

Construction and operation: A crossfader sits in the signal path between two channels and the main output. Most modern crossfaders are sliding potentiometers or found in replaceable fader cartridges; some models use optical or magnetic sensing to reduce wear and crosstalk. The travel length of a crossfader is commonly 60 millimeters, though shorter formats such as 45 millimeters exist. Many crossfaders include a curve or slope control that adjusts how quickly the mix shifts from one source to the other, allowing a linear or more abrupt fade. Wear can cause crackling or bleed between channels, leading to maintenance or replacement of the fader.

Usage and variants: Crossfaders are standard on two-channel and multi-channel mixers, and are also present in digital and hybrid setups. They are used for transitions, beat juggling, and cueing between decks or tracks. The choice of crossfader affects feel, durability, and how forgiving the fade is during rapid or aggressive manipulation.