Vocal Sibilance Finder

Knowledge Base

How This Tool Finds Your Sibilance Frequency

Rather than just showing the loudest frequency in your recording (which is usually a vowel, not an "s"), this tool identifies the specific time frames where high-frequency energy dominates the signal: the acoustic signature of unvoiced fricatives like "s," "sh," and "t." It then averages the spectrum across only those frames, revealing the frequency this particular voice's sibilance actually peaks at.

Why This Beats a Generic "5-8 kHz" Guess

Every voice sibilates at a slightly different frequency depending on mouth shape, dentition, and mic placement. Some peak closer to 4 kHz, others past 9 kHz. Feeding a de-esser the generic range instead of the measured peak either misses the problem or cuts frequencies that don't need it.

Using the Result

Set your de-esser's target frequency to the detected peak, and use the suggested bandwidth as a starting point for its Q or frequency-range control, see the De-Essing Explained guide for the rest of the setup.

FAQ

Q: What if the tool doesn't find enough sibilant frames?
A: This usually means the take doesn't have many drawn-out "s"/"sh" sounds, or the recording has significant background noise masking them. Try a longer or more speech-dense sample.

Q: Does mic type affect the detected frequency?
A: Yes, brighter condenser mics tend to emphasise sibilance higher in the spectrum than darker dynamic mics on the same voice, which is exactly why measuring your specific recording matters more than a generic number.