Fixing Lavalier Mic Rustle Noise from Hair or Clothing

We recently helped fix an audio problem on an e-learning video shoot — the kind of issue that's genuinely hard to catch in the moment.

Noise that only shows up after the fact

The client records instructors for training videos using a wireless lavalier mic. The audio had already been through standard noise cleanup, but a separate issue only became clear during final review: an intermittent crackling noise scattered through the recording.

The instructor had medium-length hair, and as she moved, strands were brushing directly against the lavalier mic capsule. Because a lavalier is a highly sensitive condenser mic sitting right against the body, even light contact produces a surprisingly loud noise — something we also see with clothing rustling against a hidden mic on narrative shoots, where an actor's movement brushes the mic under their costume.

Why a standard noise suppressor doesn't work here

Noise that comes from direct contact with the mic capsule behaves differently from ambient background noise, and a typical noise suppressor built for room tone or hiss won't touch it. For this, we used iZotope RX's De-rustle module — a tool built specifically for clothing and mic-contact rustle, and one that gets regular use in film and TV audio post-production.

De-rustle can remove a lot of this kind of noise, but rustle noise tends to spread across a wide frequency range, so pushing the removal too hard damages the voice underneath it and leaves its own kind of artifact. Getting this right meant judging how much to remove versus how much natural high end to restore afterward — which we handled with careful EQ work and some tape saturation to bring back a sense of naturalness once the noise was gone.

One plugin is rarely the whole fix

Problem audio like this almost never comes down to a single plugin solving everything. Even after years of doing this professionally, it's often hard to know exactly how much a piece of damaged audio can be improved until we actually get into the material — which is why we always review your file first, even at the quote stage, before committing to a price.

If you're dealing with a similar issue on a lavalier or hidden mic — for e-learning, documentary, or narrative work — feel free to reach out. We take inquiries from outside Japan as well.

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