NEGATIVE COMPRESSION

[♔Chello]

NEGATIVE COMPRESSION

If you use many effects on your keyboard at the same time and these are not optimally adjusted in relation to each other, this can lead to negative compression.

But what exactly is negative compression, and what does it sound like ?


Negative compression (or negative-ratio compression) does not sound like one single thing because it acts as an extreme, creative effect rather than a tool for transparent volume control.

To get a sense of what negative compression sounds like in an audio context, it helps to see how it bends a sound's dynamics:

In a standard compressor, when a sound exceeds the threshold, it gets quieter—but the output still increases slightly as the input gets louder. In a negative compressor, the exact opposite happens: the louder the input signal gets after passing the threshold, the quieter the output actually becomes.

When pushed, this creates distinct audible characteristics:

* The "Backward" or Pumping Effect: When applied to a percussive sound or synth pluck, the compressor allows the initial transient (the snap of the sound) to pass through, but then clamps down so hard that the volume drops below the threshold. This creates a reverse/sucking sound, making the tail or sustain of the note swell up before the sound fades away.

* Transient Splitting: By driving a drum or a bassline heavily into a negative ratio, the compressor literally "punches a hole" in the middle of a hit, effectively splitting a single note or drum strike into two distinct clicks.

* Extreme Ducking: On complex mixes or stems, a heavy negative ratio causes the entire audio signal to drop aggressively in volume whenever a specific loud peak (like a kick drum or a horn part) hits, creating a hard, rhythmic "pumping" and "gating" movement.


I didn't know about negative compression until I got the Pa5X and started working with effects.
I discovered early on that the phenomenon occurred when an effect had unfortunate settings, or didn't work optimally with another.

There are actually a lot of cases of negative compression on the Pa5X's internal styles, and the Finalizer function (EQ, Limiter and Compression) is largely to blame, because the problem is reduced when it is not used.

What I notice most is the pumping effect and extreme ducking that occurs.

Something similar can be experienced with a poorly designed bass reflex port in a speaker cabinet.

And a horn system with compression drivers will experience extreme negative compression if the horn is removed, because the resistance in the horn creates the necessary pressure for everything to work optimally.