Mixing Fundamentals
Compression and EQ: Two Terms That Confuse Almost Every Beginner
Priya Nalloor
If you have opened a DAW and stared at a plugin wondering what it actually does, compression and EQ are probably the two culprits. They appear on almost every track in a professional mix, yet most tutorials explain them with jargon that assumes you already know the answer.
What EQ does
EQ stands for equalisation. It controls the volume of specific frequency ranges within a sound. Think of it like a tone dial on a speaker, but with surgical precision. Too much low-end muddying your kick drum? EQ lets you reduce just that range without touching the rest of the sound.
What compression does
Compression controls the dynamic range of a sound — the gap between its quietest and loudest moments. A vocal that jumps between a whisper and a shout becomes more even after compression. It does not change the tone, only the volume behaviour over time.
Comparison at a glance
| Aspect | EQ | Compression |
|---|---|---|
| Controls | Frequency content (tone) | Volume dynamics (movement) |
| Common use | Removing muddiness or harshness | Evening out a performance |
| Audible effect | Brighter, darker, thinner, fuller | Tighter, punchier, more consistent |
| Risk if overused | Thin or hollow sound | Lifeless, flat audio |
A useful starting point
EQ first, then compress is a common workflow. Remove problem frequencies before compressing, or you risk squashing something that did not need to be there in the first place.
Neither tool fixes a bad recording. But used with restraint, they make a decent recording sound deliberate and controlled.