Master EQ and compression and you’re most of the way to better mixes. They sound technical, but the core ideas are simple once you separate what each tool actually does.
What EQ does
EQ (equalisation) adjusts the balance of frequencies in a sound. Boost to add character or air; cut to remove problems or make room for other instruments. As a rule, subtractive EQ (cutting) sounds more natural than piling on boosts.
- High-pass filter: removes low rumble from vocals, guitars and cymbals.
- Low mids (200-400 Hz): where mixes get muddy – small cuts clean things up.
- Presence and air (3-12 kHz): gentle boosts add clarity and sparkle.
A useful habit is to sweep before you commit. Set a narrow band with a moderate boost, move it slowly across the spectrum, and listen for the spot that sounds harsh, boxy or resonant. That is usually the frequency you want to cut, not boost. Once you have found the trouble spot, widen the band, pull it down by a few decibels, and check it against the rest of the mix. Most corrective EQ moves are smaller than beginners expect – a couple of decibels is often plenty. If you want a worked example on a single source, our guide to how to EQ vocals walks through these moves step by step.
What compression does
A compressor automatically turns down the loudest parts of a signal, reducing the gap between loud and quiet. The result is a more consistent, controlled sound that sits steadily in the mix. The key controls:
- Threshold: the level above which compression kicks in.
- Ratio: how hard it clamps down once over the threshold.
- Attack and release: how fast it reacts and recovers – shapes punch and feel.
- Make-up gain: brings the now-quieter signal back up.
Attack and release deserve special attention because they control feel more than level. A slow attack lets the initial transient – the pick, the snare hit, the consonant of a vocal – pass through untouched before the compressor clamps down, which keeps a sound punchy. A fast attack catches that transient and tames it, which sounds smoother but can dull the energy. Release works the other way: too fast and you hear the level pumping back up between notes; too slow and the compressor never recovers in time. Aim for a release that breathes roughly in time with the music. If the individual controls still feel abstract, our beginner’s guide on how to use a compressor breaks each one down with practical settings.
Watch the gain-reduction meter rather than chasing numbers. For gentle levelling on a vocal, a few decibels of reduction at a moderate ratio is usually enough. For obvious control or effect, you can push harder – but bypass the compressor regularly and compare it against the uncompressed signal at the same loudness. If the compressed version does not clearly sound better, you are probably overdoing it.
Using EQ and compression together
The two tools solve different problems – EQ shapes tone across frequency, compression controls dynamics over time – so they work best as a team. The order you place them in matters. EQ before compression lets you remove problem frequencies first, so the compressor reacts to a cleaner signal and is not triggered by, say, low-end rumble. EQ after compression lets you shape the final tone once the dynamics are settled. Many engineers use both: a corrective cut before the compressor and a gentle tone-shaping EQ after it.
A simple starting chain for a lead vocal is high-pass filter, a corrective cut or two, then a compressor for consistency, then a small presence or air boost to finish. Always make these decisions with the full mix playing, not on the soloed track. A vocal that sounds perfect in isolation can disappear or turn harsh once the drums and guitars are back in.
Starting points for common sources
Presets and rigid recipes will only get you so far, because every recording is different – but a sensible starting point saves time and stops you fishing around blindly. Treat the suggestions below as a place to begin listening from, then adjust to the track in front of you.
- Lead vocal: high-pass to clear rumble, hunt for boxiness in the low mids, then a moderate ratio with a few decibels of gain reduction to even out the performance. Finish with a touch of air if it needs to cut through.
- Acoustic guitar: a high-pass keeps it out of the way of the bass, and a small dip in the low mids stops it sounding woolly. Light compression tames the loud strums without flattening the picking.
- Bass: compression here is mostly about consistency, so notes sit at an even level. Use a slower attack if you want the initial note to stay punchy.
- Drum bus: gentle compression glues the kit together. A slower attack preserves the smack of the transients while still controlling the overall level. If routing several mics to one channel is new to you, see what a bus in mixing actually is.
One technique worth learning early is parallel compression. Instead of compressing the original track hard, you send a copy to a heavily compressed channel and blend a little of it underneath the dry signal. The dry track keeps its natural dynamics and transients, while the squashed copy adds body and sustain. It is especially effective on drums and vocals, where you want power and density without sacrificing the punch of the untouched signal. Start with the compressed copy turned right down, then raise it until the source feels fuller, and stop before it starts to sound flat.
Common beginner mistakes
Over-EQing (boosting everything), over-compressing (squashing the life out of a track), and mixing too loud. Go gently, make changes in context with the full mix playing, and reference often. A few more traps worth avoiding:
- Solo-ing too much: a track only has to sound good in the mix, not on its own.
- Forgetting to gain-match: louder almost always sounds “better”, which fools you into bad choices. Compare at equal volume.
- Reaching for a plugin first: a fader move or a better arrangement often fixes the problem before any processing is needed.
- Stacking processors out of habit: only add EQ or compression when you can name the problem it is solving.
Ready to put it together? Follow our beginner’s mixing guide.
Frequently asked questions
Should I EQ or compress first?
There is no single rule, but a common approach is to use a corrective EQ cut before the compressor so it reacts to a clean signal, then a tone-shaping EQ after it. Try both orders and trust your ears – the right answer depends on the track and what you are trying to fix.
How much compression is too much?
If the track sounds lifeless, pumps unnaturally, or loses its punch and energy, you have gone too far. Watch the gain-reduction meter, keep early moves gentle, and always compare the compressed and uncompressed signal at matched loudness to judge it honestly.
Do I need expensive plugins to get good results?
No. The stock EQ and compressor that ship with any modern DAW are more than capable of professional results. Understanding the controls and using them with restraint matters far more than which plugin you own. Spend your time on listening skills before spending money on processors.
What is the difference between a high-pass filter and an EQ cut?
A high-pass filter rolls off everything below a set frequency, which is ideal for clearing out rumble and low-end build-up you never wanted in the first place. A standard EQ cut, by contrast, lowers a specific band while leaving the frequencies around it untouched, so it is the better tool for surgically removing a single problem area such as boxiness or harshness.
When should I use a faster attack versus a slower one?
Reach for a slower attack when you want to keep a sound punchy, since it lets the transient through before clamping down – think snare hits or a plucked bass. Choose a faster attack when you want to tame those transients for a smoother, more controlled result, such as a busy vocal or a peaky guitar. As always, set it by ear against the full mix rather than to a fixed number.
