Try a quick experiment: open a song you recorded, put an EQ on the vocal and boost 6 dB at 3 kHz. For a second it sounds “better” – clearer, closer. Half a minute later it starts to sting, and the guitar has quietly slipped into the background. That is EQ in a nutshell: every decision in one frequency range changes the whole mix, and your ears are very good at fooling you.
This is the first part of our series on studio effects, written for people recording and producing at home in North Tel Aviv – high-schoolers in Ramat Aviv Gimel and Neve Avivim releasing a first cover, students in North and South Afeka making beats in their bedrooms, and players in Tzukei Aviv who want the band demo to sound professional. Some of the best EQ questions we hear come from our bass guitar lessons in North Tel Aviv, because down at the bottom of the spectrum, EQ mistakes are the loudest.
What EQ actually does – physics and perception
Every musical note is a fundamental plus a series of harmonics (overtones) above it. The low E on a bass sits around 41 Hz, but what gives it character – and what lets you hear it on a small speaker at all – are its harmonics, hundreds and thousands of hertz higher. An equaliser simply boosts or cuts ranges of frequencies, changing the balance between fundamental and harmonics, and between one instrument and another.
Masking: why instruments fight
When two sounds share a frequency range, the louder one hides the quieter one. That’s masking. It’s why bass and kick can blur into one lump, and why a distorted guitar can swallow a vocal. Most mix EQ isn’t about “improving” a sound; it’s about making room – deciding who owns each part of the spectrum.
Your ears don’t hear all frequencies equally
The equal-loudness contours (often called Fletcher–Munson curves) show that at low listening levels we hear less low end and less extreme top, and that hearing is most sensitive roughly between 2 and 5 kHz. Two practical lessons: louder always seems “better”, so compare before and after at matched levels; and check your low-end balance at both quiet and moderate volume.
Every control on a parametric EQ
On a parametric EQ each band is defined by three parameters, plus the filter shape:
- Frequency: the centre of the action, in hertz.
- Gain: how much to boost or cut, in dB.
- Q (bandwidth): how wide the affected range is. A low Q (roughly 0.5–1) is broad and musical; a high Q (5 and up) is narrow and surgical – for whistles, resonances and hum.
- Bell (peak): boosts or cuts around a centre frequency.
- Shelf: changes everything above (high shelf) or below (low shelf) a frequency. Great for “air” or overall warmth.
- High-pass / low-pass filters: remove everything below / above a point. The slope is measured in dB per octave – 6, 12, 18, 24 and steeper. Gentle slopes sound natural; steep ones cut like a knife.
Types of EQ and when to use each
| Type | How it works | Typical use |
|---|---|---|
| Graphic | Fixed bands at fixed frequencies (e.g. 31 bands) | Live sound and room correction – less so in mixing |
| Digital parametric | Full control of frequency, gain and Q | The everyday tool for cleaning and shaping |
| Analogue-style | “Musical” curves and a little colour, like classic consoles or the Pultec | Broad tone shaping, gentle boosts |
| Linear phase | Leaves phase relationships between frequencies intact, at the cost of latency and pre-ringing | Mastering, parallel tracks that must stay in phase |
| Dynamic | A band that only acts when its range crosses a threshold – like a compressor on one frequency | Harshness that appears only on loud notes, boomy notes on a bass |
EQ by instrument: starting points
These are common starting points, not rules. Every voice, string set and room is different – always decide by what you hear in the mix.
| Track | Clean-up | Common problems | Gentle boost |
|---|---|---|---|
| Vocal | High-pass around 80–120 Hz | Mud at 200–400 Hz, nasal “telephone” tone around 800 Hz–1.2 kHz, harshness at 2.5–5 kHz | Gentle high shelf above 10 kHz for “air” |
| Bass | High-pass around 30–40 Hz | Cardboard tone around 200–300 Hz | Definition around 700 Hz–1.5 kHz, pick/finger click around 2–4 kHz |
| Kick | High-pass around 30 Hz | “Boxiness” around 300–500 Hz | Body around 50–80 Hz, beater attack around 2–5 kHz |
| Snare | High-pass around 80–100 Hz | A narrow ring that varies from drum to drum | Body around 150–250 Hz, wires and crack around 5–8 kHz |
| Electric guitar | High-pass around 80–150 Hz | Mud around 250–400 Hz, fizz around 3–5 kHz | Presence around 1.5–3 kHz |
| Acoustic guitar | High-pass around 80–120 Hz | Boom around 150–250 Hz | String sparkle around 5–10 kHz |
| Piano | Gentle high-pass, arrangement-dependent | Muddiness around 200–400 Hz | Clarity around 3–6 kHz |
Kick and bass: where EQ wins or loses
The most famous conflict in mixing is kick versus bass. Both want 50–100 Hz, and both drive the groove. The classic solution is to decide who owns the sub region. If the bass is full and round (as in a lot of soul and pop), give it 60–80 Hz, dip the kick slightly there and let the kick speak through its attack higher up. If the kick is deep and sustained (common in hip-hop and electronic music), give it the bottom and let the bass speak through its harmonics from about 700 Hz up – which is also where it survives on a phone.
This is exactly where bass players who understand EQ have an edge: they know their tone starts in the fingers and the amp, not in a plugin. In our bass lessons for teens and adults we work on plucking technique – fingers or pick, near the bridge or near the neck – and every one of those choices is natural EQ before you ever reach the computer. If you’re new to the instrument, read why the bass holds the band together first.
How to dial in EQ by ear, step by step
- Start from a balanced mix. Faders and pan first. If you haven’t done that yet, go back to our guide on how to mix your first song.
- Name the problem in words. Muddy, harsh, distant, thin. No answer? Don’t open the EQ.
- High-pass first. Raise the filter until the instrument starts to thin out in the mix, then back off a little.
- Sweep for problems. Narrow band (Q around 5–8), a temporary 8–10 dB boost, sweep slowly. When a frequency jumps out and annoys you, turn it into a 2–6 dB cut and widen the Q a touch. Careful: everything sounds bad when boosted that hard, so don’t cut every frequency you pass.
- Boost wide and gently. If something’s missing, a broad Q and 1–3 dB is usually plenty.
- Compare at equal loudness. Use the EQ’s output gain so bypassing doesn’t change the level – then judge.
- Check in context. Un-solo. The real decision always happens in the mix.
Order, serial and parallel: how EQ works with other effects
- EQ before compression: removes rumble and boom so the compressor doesn’t react to them. The high-pass almost always lives here.
- EQ after compression: for tone. Compression brings up quiet details, so harshness sometimes needs taming again afterwards. Many engineers split it: clean-up EQ before, colour EQ after. The dynamics side is covered in our compressor guide.
- EQ on effect returns: cutting lows (roughly 150–500 Hz) and highs (roughly 6–10 kHz) on your reverb and delay returns keeps the space without muddying the mix.
- EQ and saturation: EQ before saturation decides what gets driven; EQ after it tames the new harmonics.
- Parallel EQ: less common, but you can send a copy of a track, filter it to a narrow band and tuck it under the original – most useful with linear-phase EQ or when the copy gets further processing.
Common mistakes
- EQing in solo. A guitar that sounds huge on its own will mask everything else. Decide in the mix.
- Boosting on every track. If everyone gets extra 3 kHz, nobody stands out and everything hurts.
- Over-aggressive high-passing. Each track sounds fine alone, but together the mix is thin and weightless.
- Mixing with your eyes. An analyser helps you find a frequency; it can’t tell you what’s right. A problem should be heard, not just seen.
- Ignoring level. A 2 dB boost sounds “better” even when it isn’t. Always compare level-matched.
- Fixing a recording problem in the mix. A mic too close, a boomy room, an out-of-tune amp – far easier to fix at the source. For mic choice and placement, see our home recording studio on a budget guide.
Practice: frequency ear training, 10 minutes a day
Good engineers recognise frequencies the way musicians recognise intervals. A simple plan for the coming week:
| Day | What to do |
|---|---|
| 1–2 | On a familiar song, boost 6 dB with a wide Q at 125, 250, 500 Hz, 1, 2, 4 and 8 kHz. Write one word for each (“boomy”, “boxy”, “nasal”, “harsh”). |
| 3–4 | A friend boosts one of the seven at random; you guess. Aim for 5 out of 7. |
| 5–6 | Same game with cuts – harder, because you’re listening for what’s missing. |
| 7 | Mini-mix: bass, kick and one guitar. Make room for each without touching the faders. |
EQ and bass in North Tel Aviv: how we teach it at Rockstar
At Rockstar music school in Ramat Aviv Gimel, students from Neot Afeka A, Afeka and all over North Tel Aviv learn not just to play but to understand how their playing sounds on a recording. A teacher who gigs and records can show you the difference between a tone that sounds great in the room and one that works in a mix. If you also record vocals, our singing lessons will help, and guitarists in a band will find their place in the spectrum in our guitar lessons.
FAQ
Is it better to cut or to boost?
There’s no law, but in most cases cuts clean up and make room, while boosts add character. A good rule of thumb: cut narrow, boost wide, and boost sparingly.
Does every track need EQ?
No. If a track sounds good in the mix, leave it alone. Many tracks will only get a high-pass, and some won’t get anything.
What’s the difference between EQ in mixing and in mastering?
In mixing you fix each instrument and make room between them. In mastering you touch the finished stereo file with small, broad moves only – usually less than 1–2 dB.
How do I know the bass will be heard on a phone?
Phone speakers reproduce very little below roughly 100–150 Hz, so the bass comes through via its harmonics. Check the mix on a phone; if the bass disappears, strengthen the 700 Hz–1.5 kHz area or add a little saturation.
Where can I learn bass and production in North Tel Aviv?
At Rockstar music school in Ramat Aviv Gimel, a short drive from Afeka, Neve Avivim and Tzukei Aviv. Neighbourhood details are on our music lessons in Afeka page, and you can book a free intro bass lesson in Ramat Aviv. Home lessons in North Tel Aviv are also possible, subject to teacher availability.
Read also: Bass Guitar: The Instrument That Holds the Band Together
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