Effects & processing
Bit crusher
A bit crusher throws away digital resolution on purpose — fewer bits of level, a lower sample rate, or both. The result is gritty aliased distortion that gets harsher the further you push it.
In practice
A bit crusher is a one-way door — ride it in and out across a bar rather than leaving it sitting on a record.
Small amounts do more than you expect, and the aliasing it produces is not tonal, so it clashes with the key of whatever is playing rather than reinforcing it. Use it as punctuation: a bar before a drop, a beat across a cut, then gone. On a big system it is also unpleasantly bright, so pulling some top end out while it is engaged makes it land harder rather than just hurting.
A bar
How long to hold it
Not tonal
Why it clashes
Small amounts
What is already plenty
Where these come from: Conventional effect settings, not catalog figures. For what we can measure, see the real version of throwing data away.
Why it matters
It is the one effect on a DJ mixer that destroys rather than adds. Every other unit on the strip processes the signal and leaves it recoverable; a crusher removes information, which is why it reads as violent even at a low wet level.
That violence is useful precisely because it is unmistakable. A crushed bar before a drop signals that something is coming in a way no amount of filtering does, and the ear reads the return to full resolution as a release.
Frequently asked
What does a bit crusher sound like?+
Gritty and metallic, with a harsh non-musical edge that gets worse as you push it. It is closer to digital breakage than to overdrive.
Is a bit crusher the same as distortion?+
Not quite. Distortion adds harmonics related to the original signal; a crusher removes resolution, which creates aliasing that has no musical relationship to the notes underneath.
When should a DJ use a bit crusher?+
As punctuation. A bar before a drop or across a cut, then off. It does not reward being left running the way a filter or a phaser does.
Related terms
Saturation
Saturation adds harmonics by pushing a signal into gentle distortion. It makes a sound feel louder and denser without the meter moving much, which is why almost every commercial master has some.
Noise FX
Noise FX add broadband hiss, usually filtered and swept, on top of whatever is playing. They cover a transition rather than shaping it, filling the join with sound the ear is willing to accept.
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.
Lossy compression
Lossy compression shrinks a file by discarding audio a listener is unlikely to notice. What it removes is gone permanently, and encoding an already-lossy file removes more on top.
Explore: Mixing guides · Colour FX · Saturation · All DJ terms