Sound & signal
Cutoff
Cutoff is the frequency where a filter starts acting — everything above it on a low-pass, everything below it on a high-pass. Moving the cutoff is what a filter sweep actually is.
In practice
Move the cutoff, not the fader. A high-passed record stays present while getting out of the way.
Sweep in phrase-length movements rather than continuously — a step at each phrase boundary reads as arrangement, a constant crawl reads as a knob being turned. Note where the filter is genuinely doing nothing on your mixer: most have a dead zone around the centre, so the first fifteen degrees of travel are silent and the last thirty do almost everything. Learning where that steep part is on an unfamiliar mixer is worth thirty seconds before you play.
Phrase
How far to move at once
Centre
Where the dead zone is
Steep end
Where the effect lives
Where these come from: Filter behaviour and transition practice, not catalog figures. For what we can measure, see the transition built on it.
Why it matters
It is the single control most club transitions are built on, and the reason is that moving it changes what a record occupies rather than how loud it is. A high-passed outgoing track gets out of the incoming one’s way while staying present, which no fader move can do.
The speed you move it at is more of the effect than the destination. The same sweep across sixteen bars reads as an arrangement and across one bar reads as an effect, and mistaking one for the other is why some filter transitions sound considered and others sound like panic.
Frequently asked
Why does nothing happen when I turn the filter knob?+
Most mixer filters have a dead zone around the centre, so the first part of the travel does very little and the last part does almost everything. Find the steep section before you rely on it.
How fast should a filter sweep be?+
Phrase by phrase for a transition, so it reads as arrangement. A fast sweep reads as an effect, which is a different and much more noticeable thing.
Is cutoff the same as the filter knob?+
The knob moves the cutoff — that is all a DJ filter does. Resonance, where offered separately, changes how much the frequencies at that point are emphasised.
Related terms
Resonance
Resonance boosts the frequencies right at a filter’s cutoff point, so the sweep sings rather than simply removing content. Turned far enough up it can self-oscillate into a tone of its own.
Filter
A filter removes everything above or below a moving cutoff point. A high-pass strips the bottom away as you turn it up; a low-pass takes the top off as you turn it down.
Filter fade
A filter fade uses the mixer’s filter rather than the fader to move between records: the outgoing track is high-passed until only its top remains, while the incoming one opens up from below.
Filter types
Filters differ by which part of the spectrum they remove. High-pass and low-pass cut one end, band-pass keeps a middle slice, notch removes a narrow sliver, and a shelf lifts or drops everything past a point.
Explore: Transition techniques · Filter · Filter fade · All DJ terms