Quick answer: fix the big clip-gain jumps before you touch the compressor, then audition a loud phrase, a normal phrase, and a quiet one. Blackmagic lays out 2.5:1–3:1 as commonly used dialogue ratios, but the threshold has to follow the input you actually have.
Tune attack so consonants stay intact and release so recovery stays smooth. Use the post-Dynamics Makeup Gain only to match the bypassed level. If room noise starts breathing, or the processed version only wins because it sounds louder, back off.
What a Dialogue Compressor Does
A compressor turns gain down when the signal crosses a threshold. Ratio decides how hard it reduces the portion above that threshold; Attack and Release decide when reduction begins and how it recovers. The smaller dynamic range that results keeps loud words from jumping out and makes softer words easier to place in the mix.
What it does not do: repair clipped audio, remove background noise, or know which whisper should remain quiet for the story. It won't set LUFS by itself, either. Compression is one stage between editing and final measurement.
I rechecked this page on October 1, 2026 against the September 2026 DaVinci Resolve 21.1 Reference Manual. That was a documentation check of control names and ranges, not a test mix. The manual still gives every Mixer channel built-in Dynamics with separate Expander/Gate, Compressor, and Limiter modules.
Double-click the channel-strip Dynamics indicator to open the window. The graph maps input on the X axis and output on the Y axis; the blue line is the threshold and the light green curve is the active response.
Everything here uses the built-in Mixer Dynamics compressor on a track or bus, not a standalone Fairlight FX compressor inserted on a clip. An effect containing a compressor, such as a dialogue-processing plug-in, can have different controls. For one exceptional clip, adjust clip gain, use an appropriate clip effect, or put the clip on a separate track; you won't find this whole Dynamics window in the clip Inspector.
The Expander/Gate works below its threshold. Expansion lowers softer material relative to louder material, while gating attenuates quiet sections more decisively. Neither one can tell noise from a word that opens the gate. The Compressor controls louder material and the Limiter provides firmer peak control. Keep the modules you don't need disabled.
Blackmagic's Fairlight Audio Guide comes with project media for learning the wider dialogue workflow. The training book currently listed by Blackmagic is written for Resolve 20, so I treat its screenshots as orientation aids, not control specifications. For current controls and ranges, I go by the September 2026 Resolve 21.1 manual linked above.
Clip Gain, Track Compression, or Bus Compression?
| Stage | Use it for | Do not ask it to |
|---|---|---|
| Clip gain / clip-level envelopes | Large edit-to-edit jumps, one bad phrase, microphone changes | Automatically follow an entire performance |
| Track compressor | Remaining dynamics from one consistent speaker and microphone | Reconcile unrelated rooms and recording chains |
| Dialogue bus compressor | Very gentle cohesion after tracks are balanced | Repair one bad track without moving the others |
| Main limiter | Control final peaks, then verify true peak against the delivery specification | Create a good dialogue mix from an unbalanced session |
Move boom, lav, phone, ADR, and narrator recordings to sensible tracks before processing anything. If the signal path isn't obvious, walk through our Fairlight bus-routing guide before touching Main.
Check the source channel mapping while you're there. A single microphone recorded as mono doesn't need two duplicated channels to sound centered. Preserve genuine stereo recordings, and choose the track and output layout deliberately. No single dialogue peak or LUFS value fits every mono recording, stereo mix, and delivery brief.
Clip gain changes the level reaching later track processing. Track fader automation is a different stage: use it to ride the mix, but don't expect it to change the input driving the track compressor. After any clip-gain change, recheck the threshold.
Fairlight Compressor Controls
- Threshold: the level where compression begins. A useful value depends entirely on the signal arriving at the track.
- Ratio: how much the level above threshold is reduced. At 2:1, a steady signal 2 dB above threshold comes out roughly 1 dB above it, away from the soft-knee transition and before makeup gain.
- Attack: how quickly gain reduction engages. Too fast can dull consonants; too slow lets a shout or plosive through.
- Hold: how long reduction is held before release behavior takes over. It can keep the compressor from fluttering between closely spaced syllables.
- Release: how quickly gain returns. Too short and it pumps; too long and the next phrase stays suppressed for no reason.
- Knee: how gradually the compressor eases into its ratio around threshold. A softer knee usually makes ordinary dialogue control harder to hear.
- Mix: blends the compressed signal at 0 with the original uncompressed input at 100. The default is 0, meaning all compressed signal. That's the reverse of the conventional wet control many people expect, so read the scale direction before you turn it.
- Makeup Gain: a post-Dynamics level control shared by the module, not a compressor threshold target. It raises voice and noise together; use it to level-match bypass, not to win the comparison.
- Gain Reduction meter: how much the compressor is turning down at that moment. It helps you diagnose behavior, but it can't judge sound quality.
Set a Fairlight Compressor for Dialogue
- Level extreme clips manually. Bring obviously mismatched lines near the track's normal working level. Keep intentional whispers and shouts unless the brief says otherwise.
- Choose three test sections. Loop normal speech, the loudest useful phrase, and a quiet phrase with room tone.
- Open Fairlight Dynamics. Enable Compressor and temporarily bypass Gate, Expander, and Limiter so you hear one process at a time.
- Start with a gentle ratio. Blackmagic identifies 2.5:1–3:1 as commonly used for dialogue. I treat it as an audition range, not a preset; the recording and threshold still control how much compression occurs.
- Lower Threshold. Stop when louder words show a few decibels of reduction while ordinary speech moves less.
- Set Attack. Resolve 21 defaults to 1.4 ms and allows 0–100 ms. If consonants sound dulled, try a longer attack; if peaks still stick out, try a shorter attack or repair that clip. The recording decides the value, and I'm not going to hand you an untested timing preset.
- Set Release. Resolve 21 defaults to 93 ms and allows 50–4000 ms. Follow the phrase rhythm: the response should recover smoothly, not chatter or hold down the next line. I won't pretend there's one universal speech-release range.
- Adjust Knee and Hold if needed. Use a softer transition and just enough hold to stop syllable-by-syllable movement.
- Match Makeup. Toggle bypass and match perceived loudness before deciding which version is better.
- Review the complete scene. Check every microphone change, edit, breath, pause, and downstream bus.
Attack, Release, and Threshold are source-dependent. The official ranges are wide, and threshold travels worst of all, because clip gain changes what reaches the detector.
The Attack and Release values above are factory defaults, not recommended dialogue timings. If a useful setting is already in the project, keep it. If the attack dulls a word, lengthen it and compare; if peaks escape, try a shorter attack or local clip repair. You're done when speech sounds natural, not when the knobs match a recipe.
For a fair comparison, disable the other Dynamics modules and toggle the overall Dynamics Enable button, or single-click its mini graph in the Mixer. Keep monitoring volume fixed and adjust Make Up Gain on the processed version until both sound similarly loud. The Mixer Effects In switch won't bypass built-in Dynamics, EQ, or Track FX, so it's the wrong button for this comparison.
External sidechain is optional. For normal dialogue leveling, leave the Sidechain module off unless another track or bus should drive the detector. If it's on, confirm Source is intentional, use Listen only briefly to audition that detector feed, then turn Listen off. Music ducking belongs on the music track or bus, driven by dialogue, not on the dialogue just to make it louder.
How Much Gain Reduction?
For transparent ordinary dialogue, a few decibels on louder words is a sensible place to begin. If gain reduction stays pinned through normal speech, the clip probably needs manual leveling or the threshold is too low. If only one peak triggers reduction, the compressor is acting as a loose limiter rather than shaping the performance.
Don't chase a fixed meter number. Listen for a stable sentence, intact consonants, believable room tone, and natural differences between emotion and distance. Then compare in the full mix. A 6 dB reduction can be right on one shout and obvious on another.
EQ, Isolation, Leveler, and Compression Order
Use clip gain first. Remove low rumble or a strong resonance before compression so that unwanted energy doesn't drive gain reduction; our dialogue EQ workflow explains that corrective stage. If Voice Isolation substantially changes the spectrum, use it conservatively and before final EQ and dynamics.
Check the actual processing order before you follow that advice. Mixer Effects Order can rearrange the ordinary insert block (FX), Dynamics (DY), and channel EQ; the default is FX, Dynamics, EQ. If you want track EQ to remove rumble before the compressor, choose an order with EQ ahead of DY. Changing the EQ curve alone won't move it upstream.
Built-in Track FX sit at fixed, dedicated processing points ahead of the ordinary inserts and channel Dynamics/EQ. Voice Isolation and Dialogue Leveler stay put when you reorder FX, DY, and EQ. Trim Level in Path Settings comes after Track FX, so it isn't the same correction point as changing the original clip gain.
Dialogue Leveler already rides speech. If you stack heavy compression after automatic leveling, listen for raised breaths or pumping instead of assuming a second stage improves the result. The Voice Isolation vs Dialogue Leveler comparison helps you decide whether you need separation, automatic leveling, conventional compression, or manual gain.
When Automation Beats More Compression
If a speaker leans away for one sentence, raise that clip or phrase. If one laugh is too loud, pull it down. If music masks only three lines, automate the music.
When music should move automatically under recurring speech, use the separate Fairlight audio-ducking workflow rather than over-compressing the dialogue. Lowering Threshold until the dialogue compressor solves every exception usually flattens the normal material and lifts the noise floor.
Automation also preserves story dynamics. A whisper can stay a whisper and still be intelligible; a shout can feel bigger without clipping. The compressor then handles smaller performance variation instead of doing editorial triage.
Dialogue Bus Compression and Limiting
Once separate dialogue tracks already match, a dialogue-bus compressor can add gentle cohesion. Use it only if the combined tracks need shared control. Audition a low ratio and modest reduction, and choose timing from the scene, not from a mandatory bus preset. Bypass it across the whole scene, not one line, to confirm it actually improves continuity.
A limiter on Main is a peak guardrail after the mix. It doesn't replace clip gain, track compression, or correct loudness. Resolve 21 describes it as a very-high-ratio ceiling controlled by Threshold, Attack, Hold, and Release, and warns that too much limiting can remove internal dynamics. Measure after every bus processor with our LUFS and true-peak guide.
The built-in Dynamics Limiter threshold isn't a certificate of true-peak compliance. Gain reduction tells you how much attenuation a processor applies; its output meter reports signal level, not integrated LUFS. Select the intended output bus for loudness metering, reset the measurement, and play the full delivery range. Check integrated loudness and maximum true peak against the job specification, then verify the rendered file as well.
Free vs Studio
The built-in Fairlight channel compressor is available in both DaVinci Resolve Free and Studio. Voice Isolation and some other AI repair tools require Studio, but ordinary clip gain, EQ, dynamics, routing, automation, and loudness monitoring don't.
Troubleshooting Dialogue Compression
Dialogue pumps between words
Try a longer Release or less gain reduction, then audition Hold if the response still flutters. Change one control at a time, and check whether a Gate or a downstream Limiter is causing the movement.
Consonants sound dull
Slow the Attack or reduce compression. Listen at matched output level; the bypassed signal shouldn't lose simply because it's quieter.
Room noise becomes louder
Reduce Makeup and the compressor's workload. Compression narrows the gap between voice and noise; it can't separate them. Repair or automate the source first. The Resolve background-noise guide separates steady noise, hum, Voice Isolation, and manual cleanup before you push the compressor harder.
For one loud breath or plosive, turn down that short region or repair the clip rather than compressing every word harder. A low-frequency pop may need local EQ or a dedicated repair tool, and no compressor will rebuild a clipped recording. If S sounds turn sharp, use targeted de-essing or phrase gain and check consonants afterward; there's no gender-based frequency setting to copy.
Quiet lines remain too quiet
Raise those clips or phrases before compression. Driving Threshold lower until every whisper triggers reduction will usually flatten the normal lines.
The bus clips after Makeup
Lower Makeup, inspect the dialogue bus and Main, and look for downstream EQ boosts. Makeup should match bypass, not beat it.
The export sounds different
Confirm the Deliver page renders the intended bus and channel layout, then reimport the file and listen. Our audio export checklist covers that verification.
Final Compressor Check
- Large edit-to-edit jumps are fixed before the compressor sees them.
- Normal, loud, and quiet passages have all been auditioned.
- Gain reduction moves smoothly instead of staying pinned.
- Consonants keep their leading edge.
- Breaths and room noise don't surge between words.
- Makeup is level-matched to bypass.
- The track, dialogue bus, and Main all retain headroom.
- The rendered file has been reimported and checked.
When you stop hearing the compressor and simply understand every line more easily, the settings are doing their job.
To see where compression sits in the complete signal path, use the DaVinci Resolve Fairlight audio hub alongside the routing, EQ, Voice Isolation versus Dialogue Leveler, loudness, and export guides linked above.
Fairlight Dialogue Compressor FAQ
What ratio should I use for dialogue?
Blackmagic lists 2.5:1 to 3:1 as commonly used for dialogue processing. I'd treat that as an audition range, not a preset: incoming level, threshold, performance, and intended dynamics still decide the result.
How much gain reduction is enough?
A few decibels on louder words is a reasonable starting point, but no meter reading guarantees transparent sound. If normal speech stays heavily reduced, fix clip gain or use less compression.
What attack time works for speech?
Resolve 21 defaults to 1.4 ms and allows 0–100 ms. If consonants sound dulled, try a longer attack; if peaks escape, compare a shorter attack or a clip repair. The factory default isn't a speech preset.
Why does compression raise background noise?
Gain reduction narrows the difference between voice and room sound, and then the post-Dynamics Makeup Gain raises the complete result. Reduce the compressor's workload, match bypass level, and repair or automate the source first.
Should I use Dialogue Leveler and a compressor together?
Only if each one solves a problem you can still hear. Dialogue Leveler already rides level, so keep both stages gentle and listen for breaths, noise, and pumping.
Should dialogue compression go on clips or tracks?
Correct exceptional clips with gain or automation. Use track compression for a consistent speaker and microphone, and keep bus compression for subtle shared control.
Is the Fairlight compressor available in Resolve Free?
Yes. The built-in channel Dynamics compressor is part of the standard Fairlight toolset in both Free and Studio.
