Vocal Sibilance Finder: Where Are the Harsh S Sounds?
Vocal Sibilance Finder: Where Are the Harsh S Sounds?
Drop a vocal and this sibilance analyzer marks every harsh S, SH and T on the waveform, tells you the sibilance frequency where the energy actually sits, and gives you a de-esser frequency to start from. Everything happens locally in your browser with the Web Audio API — your file is never uploaded.
Dry lead vocal works best · first 60 s analyzed
Nothing runs until you choose a file or tap a demo.
Nothing from your file leaves the browser. Decoding and analysis use the Web Audio API on your device; there is no server, no microphone access and no tracking. The only network request this page makes is fetching a demo clip when you tap one.
| Time | Length | Peak | Strength |
|---|
Mixed or processed clips with hi-hats, cymbals or bright synths will confuse this; it finds high-frequency energy, not meaning, so a breath, a loud "T" or a click can register as an S. Use it to locate where and roughly how high the problem sits, then confirm by ear in context.
- How to de-ess vocals without making them lisp
- Dynamic EQ de-essing: when it beats a de-esser
- How to fix sibilance after Autotune
You now know where the S energy sits. The Vocal Chain Bible's 88 real chains show where each engineer placed the de-esser in the chain and what they used — mic, preamp, plugins and settings for each hit record, every chain also in a free-plugin version.
See the 88 vocal chains →Try one free chain firstWhere sibilance lives by voice type
| Voice / symptom | Typical S energy | What to do |
|---|---|---|
| Male, chest voice, warm mic | 4–6 kHz | De-ess lower than the usual preset; a 6–8 kHz band misses it and dulls the air instead. |
| Female / bright voice | 6–9 kHz | Classic de-esser range. Start around the frequency this tool reports, 3–4 dB, split-band mode. |
| Breathy / airy / whispered | 8–12 kHz | Narrow band, gentle threshold. Too much here kills the breathiness you probably wanted. |
| Symptom: lisp, "th" instead of "s" | — | De-esser is too deep or set too low. Back off 2–3 dB, raise the center frequency, shorten release. |
| Symptom: dull, no air after de-essing | — | Band too wide or wideband mode on. Use split-band so only the S band ducks, not the whole vocal. |
De-esser vs dynamic EQ vs static EQ
| Tool | What it does | Use it when |
|---|---|---|
| De-esser | Compresses one band only when the S is loud; vowels pass untouched. | Default for most vocals: the S is consistent and sits in one band. |
| Dynamic EQ | Same idea with surgical control: several bands, each with its own threshold and Q. | S energy moves around (two singers, big range, Autotune artifacts) or you need two narrow bands at once. |
| Static EQ cut | Removes the band all the time, S or no S. | Almost never for sibilance alone; it dulls every vowel. Only for a fixed mic resonance or a harsh room tone. |
Ranges are typical, not rules: the point of the analyzer above is to measure your take instead of assuming one of these rows.
More free vocal tools
What sibilance is, and what a "sibilance frequency" actually means
Sibilance is the hiss of S, Z, SH, CH and the sharp burst of T: consonants made by forcing air through a narrow gap at the teeth. Unlike vowels, which are mostly harmonics below 4 kHz, these sounds are broadband noise concentrated between roughly 4 and 12 kHz. A mic a few inches from the mouth hears them far louder than a listener would, and every bright EQ boost, compressor and saturator downstream makes them louder still. People searching for the sibilance frequency want one number; the honest answer is a range that depends on the singer, the mic and the take, which is why the reliable way to find sibilance in vocals is to measure the take rather than trust a preset.
Why 6 kHz isn't always the right de-esser frequency
Most de-esser presets default to 6–7 kHz, a fair average for a bright female pop vocal on a condenser. But a baritone singing chest voice into a dynamic mic often puts his S energy at 4–5 kHz, where a 6 kHz de-esser barely reacts, so you push the threshold down until the vowels dull and still hear the S. A breathy, close-miked singer may peak at 9–11 kHz, where the same preset catches air instead of sibilance. Set the de-esser where the energy actually is and you need less reduction: 3 dB in the right place sounds like nothing happened, 8 dB in the wrong place sounds like a lisp.
How this vocal sibilance analyzer measures
The clip is mixed to mono and cut into 1024-sample frames every 10 ms, each windowed and run through an FFT. For every frame the tool compares energy in the "voice body" band (200 Hz to 4 kHz) with the "hiss" band (4 to 10 kHz). Vowels have far more body than hiss; an S has more hiss than body. A frame is flagged when it is within 35 dB of the loudest moment in the clip and its hiss-to-body ratio is above 1. Consecutive flagged frames become one event; anything under 20 ms is dropped as a click. Each event's peak is the strongest bin between 3 and 12 kHz, and the de-esser suggestion is the median peak across every sibilant frame, so a long, loud S counts for more than a 20 ms tick. The intensity label comes from how much of the audible signal is sibilant and how often events occur. If nothing crosses a ratio of 1, the tool relaxes it to 0.6 and labels the result "weak sibilance"; if still nothing, it says so. "No clear sibilance" is a real result, not a failure.
Mic choice, distance and angle decide half of it
Sibilance is largely recorded, not mixed. A condenser with a presence peak at 8–10 kHz, pointed straight at the mouth from four inches, prints S sounds several dB hotter than the vowels before any plugin is touched. Three free fixes: back off to six to ten inches, which flattens the ratio because hiss is directional and the voice body is not; angle the mic 10–20 degrees off-axis so the airstream from the teeth misses the capsule; and use a pop filter. If the analyzer flags a strong result on a dry take, try those before reaching for a plugin.
Where the de-esser goes in the chain
Usually after compression, not before. A compressor levels the vowels up toward the consonants and often adds high-frequency grit, so sibilance that was tolerable on the raw take turns harsh after it; de-essing afterwards fixes what the chain actually produced. Many engineers run a second, gentle de-esser at the very end, after saturation or an exciter, to catch what those stages added. The exception is a de-esser first in the chain to stop S bursts from pumping the compressor; that is a dynamics fix, usually paired with another de-esser later. If you tune with Autotune or Melodyne, de-ess before the tuner where possible, since tuners can smear sibilance into a metallic whistle that is much harder to remove.
When it's the mic or the room, not the mix
Many strong events centered above 9 kHz on an untreated-room recording usually point at a bright mic too close, or a reflective surface (desk, screen, window) bouncing the top end back into the capsule. Treat that at the source: a reflection filter or a blanket behind the singer, a different mic position, or a different mic. Dental work, a cold, or a singer who hisses for style are also real; no plugin changes anatomy, but a dynamic EQ with two narrow bands tames it more naturally than one wide de-esser. The analyzer gives you the where and how much; whether to fix it with a mic move, a clip-gain dip or a de-esser is a call you make with the full mix playing.
FAQ
What frequency is vocal sibilance?
Usually between 4 and 10 kHz, with most singers landing at 5–8 kHz. Male chest voices on warm mics sit lower (4–6 kHz), bright or breathy singers higher (8–12 kHz). This tool measures your take so you don't have to assume.
Does this tool upload my vocal?
No. The file is decoded and analyzed in your browser with the Web Audio API and never leaves your device. There is no server-side step, no account and no microphone access. The only network request is fetching a demo clip if you tap one.
How accurate is the sibilance detection?
It reliably finds frames where energy above 4 kHz exceeds energy below it, which is what an S is acoustically. It can be fooled by hi-hats, bright synths, breaths and clicks, so use it on a dry lead vocal and confirm what it marks by ear. Peak frequencies are typically within a few hundred hertz of what a spectrum analyzer would show.
What de-esser settings should I start with?
Center the band on the reported peak frequency, use split-band mode with a width of about ±1.5 kHz, and set the threshold so you get 3–4 dB of reduction on the worst S and little or nothing on vowels. Listen in the full mix; if vowels get dull, raise the frequency or narrow the band before adding more reduction.
Should the de-esser go before or after the compressor?
After, in most chains, because compression raises the apparent sibilance. A second gentle de-esser at the end of the chain is common on bright vocals. Put one before the compressor only when S bursts are making the compressor pump.
Why does my vocal sound lispy after de-essing?
Too much reduction, or the band is centered too low so the de-esser is eating the body of the consonant rather than the hiss. Back off to 3–4 dB, move the frequency up toward the measured peak, and shorten the release so the dip ends with the S.
Can I use this on a full mix or a mastered song?
You can, but the result will be noisy: cymbals, hi-hats and bright synths share the same band as sibilance, so many events will not be S sounds. It is designed for a solo vocal track, dry or lightly processed, up to 60 seconds.
Know the problem. Now copy the chain that solves it.
The Vocal Chain Bible is a 187-page PDF with 88 real vocal chains from hit records, as reported by the engineers in public interviews — mic, preamp, plugins and settings, including where each engineer placed the de-esser and what they used, each chain also in a free-plugin version, plus the full Vocal Chain Maker app. Once you know where your sibilance sits, copy a chain built for your voice instead of guessing.
88 chains · every chain in a free-plugin version · Try one free chain firstFree download
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