What is subtractive EQ and how does it work?

Subtractive EQ is the practice of reducing or cutting frequencies rather than boosting them. By removing unwanted frequencies that cause muddiness or masking, you create space for other instruments to be heard clearly without adding gain or noise to your signal.

Which frequencies should I cut first when mixing?

Start by cutting low-end rumble below 80Hz on non-bass instruments, reduce muddiness around 200-400Hz where buildup commonly occurs, and address harshness in the 2-5kHz range. Use a narrow Q to surgically remove problem frequencies while preserving the character of the sound.

Can I still use additive EQ after applying subtractive EQ?

Yes, subtractive and additive EQ work best together. After cleaning up a track with cuts, you may find that certain elements need gentle boosts to sit properly in the mix. The key is to cut first to create headroom, then add subtle boosts only when necessary to enhance the sound.

Cut Before You Boost: The Golden Rule of EQ

EQ is your most powerful mixing tool—but most people use it backward. This post covers why subtractive EQ (cutting) should always come before additive EQ (boosting), and how this simple habit will clean up muddy mixes, preserve headroom, and save hours of frustration.

Why should you cut frequencies before boosting?

Cutting creates space without adding energy. When you boost, you're raising the overall volume of a track—and potentially introducing phase issues or distortion. (That's how you end up with a mix that sounds loud but messy.) By cutting unwanted frequencies first, you solve problems at the source. The mix breathes better. You'll find you need fewer boosts overall.

Here's the thing: every DAW's EQ works the same way fundamentally. Whether you're using FabFilter Pro-Q 3, Waves Q10, or Logic's stock Channel EQ, cutting 3 dB at 400 Hz gives you more clarity than boosting 3 dB at 3 kHz to compensate. Cut the mud. Then boost only if something still needs air or presence.

What frequencies should you cut first?

Start with the low end—almost everything except kick and bass has garbage below 80 Hz. Here's a practical breakdown:

Instrument	Cut Frequency	Why
Vocals	80-120 Hz	Removes rumble from the mic stand
Electric Guitar	100-150 Hz	Frees up space for bass guitar
Acoustic Guitar	200-300 Hz	Reduces boxiness, adds clarity
Snare Drum	250 Hz	Cuts the "honk," helps it crack
Synth Pads	300-500 Hz	Prevents masking the vocal

The catch? Don't cut just because a chart says so. Sweep with a narrow boost first—find the problem spot where it sounds worst—then cut there. Trust your ears over the numbers.

Which EQ plugins are best for subtractive mixing?

Universal Audio's API 560 graphic EQ and FabFilter Pro-Q 3 dominate professional studios for good reason. The API offers fixed frequencies that force quick decisions—you can't overthink. Pro-Q 3 gives surgical precision with dynamic EQ that responds to the performance.

That said, stock plugins work fine. Logic's Channel EQ, Pro Tools' EQ7, Ableton's EQ Eight—they all cut frequencies identically to expensive alternatives. The tool matters less than the technique. (Though having a visual analyzer helps spot problems you might miss.)

Worth noting: Sound on Sound's guide to subtractive EQ covers advanced techniques like mid-side processing—cutting sides at 200 Hz while keeping the center intact creates massive stereo width without losing power.

Start your next mix with three cuts. High-pass the vocal. Notch 250 Hz from the guitar. Dip 400 Hz on the snare. Notice how the whole track opens up. Boosting becomes the finishing touch—not the fix for poor recording habits.