How to Use EQ: Adjusting EQ, Frequency Chart and Mixing Basics

To adjust EQ, find the frequency range that's causing a problem or that you want more of, then cut or boost that range with an EQ band, starting small and comparing with the EQ bypassed. Most of the time that means cutting a little mud and harshness first and adding a broad boost only where the sound needs more character.

The rest is knowing where things live in the frequency spectrum and which controls do what. This guide covers both, plus a repeatable method you can use on any track.

What is EQ in sound?

EQ (equalization) turns specific frequency ranges up or down. Low frequencies are the weight and boom of a sound, mids are its body and character, and highs are its edge, detail and air. An EQ lets you change that balance: thin out a boomy guitar, bring a buried vocal forward, or take the sting out of a cymbal.

EQ is the most-used tool in mixing because instruments overlap. A kick, a bass, a piano's left hand and a male vocal all have energy in the low mids. Each one sounds fine on its own, but together they pile up into mud. EQ is how you give each part its own space.

EQ controls: frequency, gain and Q

• Frequency: the center of the band you're adjusting, in Hz or kHz.
• Gain: how much you boost or cut, in dB. A few dB is a clear change. 10 dB or more is drastic.
• Q (bandwidth): how wide the band is. A high Q is narrow and surgical, for a ringing note or a hum. A low Q is wide and musical, for tone shaping.
• Band type: a bell boosts or cuts around a point; a shelf raises or lowers everything above or below a point; a low cut or high cut filter removes everything past a point.

Most plugin EQs are parametric, meaning you control all three settings on each band. If you've only used fixed sliders before, our parametric vs graphic EQ guide explains the difference.

EQ frequency chart

These ranges are approximate and overlap, but they tell you where to start looking.

How to adjust EQ, step by step

1. Listen in context first. Play the full mix and decide what's wrong before you touch anything: too boomy, too harsh, buried, thin. EQing with no goal is how mixes get worse.
2. Cut the low end you don't need. A low cut removes rumble and handling noise from most non-bass sources. Raise it until the sound starts to thin, then back it off a little.
3. Sweep for problems. Set a bell to a narrow Q and boost it 8 to 10 dB. Sweep slowly across the range until the problem jumps out (a ring, a box, a harsh whistle), then turn the boost into a cut.
4. Cut modestly. Two to five dB usually fixes it. Widen the Q until the problem goes away without the sound losing its character.
5. Boost for character. With the problems gone, add broad boosts where the sound needs it: presence on a vocal, air on acoustic guitar, low end on a kick.
6. Match the level and compare. Use the output gain so the EQ'd version is as loud as the original, then toggle bypass. Louder always sounds better, so level-matching keeps you honest.

Mud is the problem you'll fix most often, so here's what a typical low-mid cleanup looks like. Contour's Mud Remover preset cuts 5 dB at 250 Hz with a fairly tight Q and a further 2 dB at 500 Hz. Toggle it on a full loop and listen to the low mids clear without the track losing its weight.

How to increase EQ without making it harsh

In mixing, increasing EQ means boosting a frequency range. It's the move that causes the most trouble, because boosts add level and they're easy to overdo.

• Boost wide, cut narrow. Broad boosts sound natural. Narrow boosts sound like a resonance, which is usually what you were trying to remove.
• Boost where the instrument is, not where it isn't. Boosting 10 kHz on a dark bass guitar raises hiss, not detail.
• Use shelves for top and bottom. A high shelf adds air smoothly across the whole top end. A low shelf adds weight without the boom of a narrow bass bump.
• Cut the competition instead. If the vocal needs presence, a small cut at 2 to 4 kHz on the guitars often works better than another boost on the vocal.

High-end boosts are where a good EQ curve matters. Contour's Air Lift preset adds a 5 dB high shelf at 12 kHz with a gentle 1.5 dB lift at 8 kHz, and its shelves keep their shape near 20 kHz instead of cramping. Try it on the voice or keys loop.

Common EQ mistakes

• EQing in solo. A vocal that sounds thin on its own often sits perfectly in the mix. Make final decisions with everything playing.
• Low cutting everything to the same point. Cutting all tracks at 100 Hz can drain the warmth from a mix. Set each low cut by ear.
• Chasing the analyzer. A spectrum display shows where energy is, not whether it sounds good. Use it to find frequencies, then trust your ears.
• Fixing with EQ what needs a different tool. An S that only gets harsh on certain words is a job for a de-esser. A bass that jumps around in level needs compression, not EQ.

For instrument-specific moves, see our guides to EQing drums and EQing vocals. Both use Contour, our 5-band parametric EQ with low and high cut and a live analyzer, for the examples.