Mastering EQ Settings That Work
Published · updated · by Loopin
Mastering EQ is broad and gentle — you’re shaping the tonal balance of a finished mix, not carving individual tracks. Think fractions of a dB up to a couple of dB, always with a wide Q. Here are the moves that actually work, why narrow surgical EQ backfires on a full mix, and how to hear it for yourself.
The mindset: shape, don’t carve
In mixing you fix individual tracks, sometimes with narrow, aggressive cuts. Mastering is the opposite discipline: you’re nudging the balance of the whole stereo file, so every move affects every instrument at once.
That’s why mastering EQ is measured in fractions of a dB to a couple of dB, with wide bells and gentle shelves. If you find yourself reaching for a big boost or a deep notch, the problem probably belongs back in the mix.
High-pass the sub rumble (around 20–30 Hz)
Almost every master benefits from a gentle high-pass around 20–30 Hz. There’s rarely useful musical content down there — just rumble, handling noise and DC-ish energy that eats headroom and makes the limiter work harder for nothing.
Keep the slope gentle and the corner low so you clean up the sub-sonic junk without thinning the real bass. This tiny move alone often gives you cleaner headroom before anything else.
Tame low-mid mud (a wide cut, 200–500 Hz)
The most common corrective move on a master is a wide, gentle cut somewhere in 200–500 Hz. This low-mid region is where the vocal body, guitars, keys and bass harmonics all pile up, and a crowded mix reads as boxy or muddy.
To find the exact spot, some engineers briefly boost a wide band and sweep it until the mud is at its most obvious, then pull that same band down instead. Don’t leave the boost in — it’s only a way to locate the problem before you cut it.
A broad dip of a decibel or two here opens the whole track up — the vocal steps forward and the low end tightens. The key is wide Q: a narrow notch just makes the mix sound hollow and scooped instead of clear.
Add air with a subtle high shelf (10 kHz+)
A little sparkle up top makes a master sound open and expensive. A subtle high shelf at 10 kHz and above, lifted by a fraction of a dB to a couple of dB, adds air and detail without harshness.
A shelf is the right shape here because it lifts everything above the corner frequency evenly, rather than spotlighting one band the way a bell would. That even lift is what reads as “air” rather than “bright.”
Go gently — too much shelf turns cymbals and sibilance brittle and fatiguing over a full listen. If the mix already sounds bright, skip this or use even less. The goal is a sense of air, not a spotlight on the high end.
Why narrow deep moves sound wrong on a full mix
Narrow, deep boosts and cuts are a mixing tool, not a mastering one. On a full mix a narrow deep boost makes one resonance jump out unnaturally, and a narrow deep cut leaves an audible hole in the tonal fabric — you can hear the EQ working, which is exactly what you don’t want.
Small moves, wide Q is the whole philosophy. Broad shapes feel like the record was simply balanced better; sharp shapes feel like it was operated on.
There’s a practical reason too: a master affects every instrument at once. A narrow 3 kHz boost meant to brighten a dull vocal will also spotlight the snare, the guitar pick and any sibilance in the mix. Broad moves spread their effect evenly across the whole balance, which is why they sound natural where surgical moves sound obvious.
Match loudness before you judge
The single biggest EQ mistake is judging with the levels mismatched. Louder almost always sounds “better” to the ear, so if your EQ’d version is even slightly hotter you’ll fool yourself into thinking the EQ helped when it was really just the extra level.
Always A/B at matched loudness — turn the processed version down to sit level with the original before you compare. If the EQ move still sounds better matched, it’s a real improvement. This one habit will save you from a hundred bad EQ decisions. A tool like Loopin’s online mastering makes this easy with a built-in Original vs Mastered A/B.
A quick, reliable EQ workflow
You don’t need a dozen bands. A short, disciplined pass beats an aggressive one:
- Set a gentle high-pass around 20–30 Hz to clear sub rumble.
- Find the muddiest region between 200–500 Hz and pull it down a dB or two with a wide bell.
- If it sounds dull up top, add a subtle high shelf at 10 kHz+.
- Prefer it automatic? Run the mix through Loopin’s free online mastering and let its corrective EQ make these exact moves for you.
- A/B against the original at matched loudness — the master should sound clearer and more balanced, not obviously EQ’d.
- Bounce and check on a phone and a laptop, where tonal problems show up fastest.
Let corrective EQ happen automatically
If dialling wide bells by ear isn’t your thing, Loopin’s free online mastering applies exactly this kind of broad, gentle corrective EQ for you — high-passing sub rumble, taming low-mid mud and adding a touch of air — before it moves on to compression, saturation, stereo and limiting.
It’s all in your browser with nothing uploaded: free, no signup, no watermark, full-quality WAV out. Run your mix through it and A/B the result to hear balanced EQ done right.
Frequently asked questions
How much EQ should I use when mastering?
Very little — fractions of a dB up to a couple of dB, with wide Q. Mastering EQ shapes the tonal balance of a whole mix, so gentle broad moves are the goal. Big boosts or deep notches usually mean the fix belongs back in the mix.
What frequencies do you cut when mastering?
Most commonly a wide, gentle cut in the low-mid mud around 200–500 Hz to open the mix up, plus a gentle high-pass around 20–30 Hz to remove sub rumble. Both should be broad, not narrow notches.
How do I add air to a master?
A subtle high shelf at 10 kHz and above, lifted by a fraction of a dB to a couple of dB. Go gently — too much makes cymbals and sibilance harsh and fatiguing. If the mix is already bright, use even less or skip it.
Should I use narrow EQ cuts when mastering?
Generally no. Narrow deep boosts and cuts sound unnatural on a full mix — a narrow boost makes a resonance jump out and a narrow cut leaves an audible hole. Small moves with wide Q are the mastering philosophy.
Can I get mastering EQ without a plugin?
Yes. Loopin’s free online mastering applies broad corrective EQ automatically — high-passing rumble, taming low-mid mud and adding gentle air — in your browser with nothing uploaded, free and without a watermark.