Effects & processing
Phaser
A phaser sweeps a set of notches through the frequency spectrum, cancelling thin bands as it moves. The result is a hollow whoosh that circles rather than rising, and it never quite arrives anywhere.
In practice
A phaser moves without going anywhere — use it to hold tension through a long blend, not to signal a change.
Slow rate, modest depth, and leave it running. The instinct to push the resonance up is worth resisting: a phaser that whistles becomes the loudest thing in the mix and stops doing the job you put it there for. It works best on sustained material — pads, chords, a top line — and does very little on drums, because there is not enough continuous content for the notches to bite on.
Slow
Sweep rate that works
Pads and chords
What it bites on
No destination
Why it holds rather than builds
Where these come from: Conventional effect settings, not catalog figures. For what we can measure, see the more aggressive relative.
Why it matters
A phaser is the effect for holding a moment open. Because the sweep cycles rather than climbing, it adds movement without promising a change — which makes it useful under a long blend where a riser or a filter sweep would tell the floor something is about to happen.
It is also gentle enough to leave on. The notches remove narrow bands rather than whole ranges, so a phaser at a slow rate sits under a record for eight or sixteen bars without the mix feeling processed.
Frequently asked
What is the difference between a phaser and a flanger?+
A phaser uses all-pass filters to create a handful of moving notches; a flanger uses a very short delay, which creates many evenly spaced ones. The flanger is the more metallic and aggressive of the two.
What does a phaser sound like?+
Hollow and circling — a whooshing motion that cycles rather than climbing. It is subtler than a filter sweep and does not imply that anything is about to change.
When should a DJ use a phaser?+
Under a long blend, where you want movement without a signal. It is the wrong choice for a build, because it never resolves.
Related terms
Flanger
A flanger mixes a signal with a copy of itself delayed by a few milliseconds, and moves that delay. The interference produces a metallic jet-engine sweep — the same idea as a phaser, far more aggressive.
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.
Sweep
A sweep moves a filter across a sound so its brightness travels — up towards a moment or down away from one. It works as an arrangement element inside a track and as a live move on a mixer.
Colour FX
Colour FX are the per-channel effects on the knob above each channel — filter, noise, crush, echo. Centred is off; turning either way engages the effect on that deck alone.
Explore: Mixing guides · Filter · Sweep · All DJ terms