Dynamics & Compression

What is Multiband Compression?

Multiband compression splits the audio signal into separate frequency bands and applies independent compression to each band, allowing precise dynamic control across the spectrum.

How It Works

A multiband compressor divides the incoming audio into two or more frequency ranges using crossover filters — for example, lows (below 200 Hz), low-mids (200-2000 Hz), high-mids (2000-8000 Hz), and highs (above 8000 Hz). Each band then gets its own compressor with independent threshold, ratio, attack, release, and gain settings. This means you can compress the bass frequencies hard to tighten a boomy low end without affecting the clarity of the vocal range or the sparkle of the highs. The crossover frequencies are critical settings that define where one band ends and the next begins. Poor crossover choices can create artifacts at the boundaries between bands, especially if the crossover slopes are too steep. Most multiband compressors offer adjustable crossover points and slopes so you can tailor the frequency splits to your specific material. Multiband compression is especially useful in mastering, where you are working with a stereo mix and cannot adjust individual instruments. If the kick drum causes the whole mix to pump, a multiband compressor lets you tame just the low frequencies. If the cymbals are inconsistent, you can compress only the high band. It gives you surgical control that a full-band compressor simply cannot offer.

Why It Matters for Your Mix

In a full mix, different frequency ranges often have very different dynamic behaviors. The bass might be steady while the midrange fluctuates wildly, or the highs might spike during cymbal crashes. A standard broadband compressor responds to the loudest element at any given moment, which often means the kick drum is triggering compression that ducks the entire mix. Multiband compression solves this by treating each frequency region independently. For mastering, multiband compression is an essential rescue tool — it can fix low-end inconsistencies, tame harsh upper mids, or add sparkle to dull highs without touching the rest of the spectrum. For mixing, it is valuable on complex sources like drum busses, full mixes, or problematic vocal recordings where issues live in specific frequency ranges.

Common Mistakes

Using multiband compression when a simple EQ would suffice

If a frequency range is consistently too loud (not dynamically inconsistent), a static EQ cut is cleaner and more transparent than multiband compression. Reserve multiband compression for problems that change over time — frequencies that are sometimes too loud but other times fine.

Setting crossover frequencies carelessly

Placing a crossover right in the middle of an important frequency range (like a vocal fundamental) can cause the vocal to shift character as it moves between bands. Place crossovers in frequency ranges where fewer important elements live.

Over-processing with too many bands

More bands do not mean better results. Each additional band introduces more potential for artifacts at the crossover points and makes the processing harder to control. Three to four bands is usually sufficient for most mixing and mastering applications.

How We Analyze This in Your Mix

RoastYourMix evaluates the dynamic consistency across different frequency bands in your mix. We measure whether the low-end dynamics are well-controlled, whether the midrange maintains a consistent presence, and whether the highs are balanced — all indicators of whether multiband processing has been applied effectively or if specific frequency ranges need tighter dynamic control.

See Multiband Compression in Action

Upload your mix and see how multiband compression affects your track.

Get Your Mix Roasted

Frequently Asked Questions

It is possible but usually unnecessary. On individual tracks, a standard compressor combined with EQ typically gives cleaner results. Multiband compression shines on busses (drum bus, mix bus) and in mastering where you are working with complex, combined signals.

A common starting setup for four bands: low below 120-200 Hz, low-mid from there to 1-2 kHz, high-mid from there to 6-8 kHz, and highs above. Adjust these based on your material — the goal is to isolate frequency ranges that behave differently in terms of dynamics.

They are related but different. A dynamic EQ applies EQ boosts or cuts that respond to the signal level at a specific frequency, using narrow bands. Multiband compression applies compression to broad frequency ranges. Dynamic EQ is more surgical; multiband compression is broader in scope.

Related Terms

Compression EQ (Equalization)De-essing

Ready to Hear the Truth?

Upload your mix and get instant feedback. Free health score, frequency analysis, and actionable fixes.