De-esser
Definition
A frequency-specific compressor designed to reduce harsh sibilance — the "s," "sh," and "t" sounds — in vocal recordings. Targets a narrow high-frequency band and applies gain reduction only when that band is triggered.
In Simple Terms
A tool that tames harsh "s" and "sh" sounds in vocals without dulling the whole voice. It only acts when those specific sharp frequencies appear, leaving everything else untouched.
In Practice
A de-esser is inserted on a bright vocal recording with the detector tuned to 6–8 kHz. When the singer hits a sharp "s," the de-esser drops 3–4 dB only in that band for the duration of the consonant, leaving body, breath, and air untouched.
Common Confusion
A de-esser is not a high-shelf cut — it is dynamic. A static EQ cut at 7 kHz would dull every word in the take, including those without sibilance. A de-esser only reduces gain when the targeted band actually exceeds the threshold, preserving brightness on everything else.
Sources & Verification
- Owsinski, B. — The Mixing Engineer's Handbook (4th ed., vocal de-essing chapter)Bobby Owsinski Media Group, 2017
- Izhaki, R. — Mixing Audio (3rd ed., sibilance control)Focal Press, 2017
Last verified: 2026-05-05