Filter
Effect that filters out particular frequencies.
Detailed explanation
A filter is an audio effect that acts on frequency ranges of the signal. Two types: a high-pass filter (HPF) lets high frequencies through and cuts the bass — the track sounds thin and open. A low-pass filter (LPF) lets low frequencies through and cuts the highs — the track sounds muffled and warm. A control actually labelled FILTER is the exception: according to its manual the DDJ-FLX2 has a CFX control instead, and what that does depends on the rekordbox version in use. Look up in your own device's manual what the equivalent control is called there. Widely used for filter-sweep transitions.
Sources (1)
- DDJ-FLX2 — Bedienungsanleitung (User manuals & documentation)Primary sourceAlphaTheta Corporation·Manufacturer·2024-11-14·retrieved 03.08.2026
German edition, 156 pages. The dates contradict each other: 14.11.2024 on the documentation page, 29.10.2024 in the German support article. To be resolved at the next re-check.
In practice
The simplest transition that always works: you slowly close the filter on the playing track until only the highs are left, and bring the new track up at the same time. The room hears a change without any basslines colliding. That is exactly why the filter is the most used and most quickly overused knob in the booth — turn it on every transition and after an hour you no longer have an effect, you have a habit.
Assessment by the DJLearn editorial team — experience, not a sourced factual claim.
Related terms
Where to learn this
Using filters
The guide that covers this topic in depth.
Explained in this phase
Phase 10: FX & Filter