Remove Plosives from Audio: Fix the Pops at the Source

What a plosive actually is

A plosive is a small explosion of air. When a speaker releases a P, B, or T, a puff of breath travels toward the microphone before the voiced sound begins, and when that puff strikes the capsule it produces a low-frequency thump: the pop every recordist knows. It is not a noise floor, not an electrical artifact, and not something a denoiser was designed to see.

Physics explains both the problem and the solution. The energy is concentrated at low frequencies, which is why a pop sounds like a thud rather than a hiss, and it arrives as a directional gust, which is why geometry, the angle between mouth and microphone, changes how much of it lands. Move the microphone off the direct path and most pops never occur.

The practical consequence: plosives are overwhelmingly a recording problem. Fixing them after the fact is possible for mild cases and awkward for severe ones, which is exactly backwards from a noise bed, where cleanup often outperforms prevention.

Fix at the microphone

The source fixes are cheap, and each one buys a few decibels of protection:

1. Move the microphone off-axis: speak slightly past the grille rather than straight into it, so the air blast misses the capsule.
2. Keep a hand's width or more of distance; pops weaken quickly with distance while the voice loses less than it seems.
3. Fit a pop filter: a nylon screen or metal mesh breaks the gust without dulling the top end when it is used correctly.
4. Use the foam windscreen that came with the microphone as a baseline; it helps more than its small size suggests.
5. Practice the plosive sounds specifically; many speakers naturally reduce them once they can hear the difference on headphones.
6. For heavy cases, tilt the microphone up or down a few degrees from the line of speech and re-check the tone.

Why a pop filter works, and what it will not fix

A pop filter is a speed bump for air, not a wall. The mesh disperses the gust into many small eddies before it reaches the capsule, which softens the low-frequency spike while leaving most of the voice untouched. Placement matters: two inches in front of the microphone and a hand's width in front of the mouth is the classic geometry, close enough to work and far enough not to collide with the speaker.

It will not fix a plosive that is already recorded, it will not help if the speaker eats the microphone anyway, and it does not substitute for distance and angle. Treat it as one layer in a stack that starts with geometry.

Salvaging recorded P-pops

When the recording already has pops, the edit is a small surgery per event:

1. Find each pop on the waveform; it shows as a low-frequency bulge at the start of a word, much wider than a click.
2. Select just the bulge, a few tens of milliseconds, and reduce its low-frequency energy with a high-pass or a short EQ move rather than deleting the region.
3. Check the result against the unedited take; if the pop went from a thump to a soft thud, that is usually as far as an edit should go.
4. For severe pops that survive the edit, replace the word from another take or re-record the single sentence.

The EQ approach, applied with restraint

The standard edit is a brief high-pass over the pop's region: cut the frequencies well below the voice and the thump thins out. The restraint is in the duration and the depth. Apply the cut only across the pop, not the whole word; keep it as shallow as the pop allows; and listen for a dulled consonant afterward, which is the sign the cut ran long.

A second pass with a gentler setting beats one aggressive pass in every case we have seen, and the reason is the same as everywhere else in cleanup: the second listen has the first attempt as a reference, and the ear is better at comparing than at deciding from scratch.

What cleanup can do around plosives

A steady-noise pass does not remove pops, and it should not be sold as doing so; the energy here is an event, not a bed. What a pass can do is improve the context: with the room quieter, the contrast between a softened pop and its surroundings is smaller, and the edit blends more convincingly.

The order that works: reduce the bed on a copy with a pass such as SimpleClean's, run the pop edits on the cleaned file, compare against the original, and keep the version that reads most naturally. If the take has both a steady bed and frequent pops, this two-stage approach handles each problem with the tool built for it.

The three-strike setup test

Before a session that matters, a ten-minute test settles the microphone setup: record the same deliberately pop-heavy sentence three ways, straight into the grille, angled across it, and angled with the pop filter, and compare the three takes on headphones. The differences are usually obvious and immediate, and the winning setup is worth writing down for the room.

The test also calibrates the speaker. Most people reduce their plosives within a sentence or two of hearing one on playback, which means the third setup often performs better mostly because the delivery improved. That is not cheating; it is the real-world merge of technique and equipment that makes sessions cleaner.

When the pop is in the recording and the word matters

The hardest case is a severe pop on a word that carries meaning, because both halves matter: the word must survive and the thump must not. Work in this order: try the brief high-pass edit first and judge honestly; if the word still sounds buried, mute the popped word and check whether the sentence survives without it; if it does not, pull the word or sentence from another take and crossfade it in.

Take-swapping deserves more use than it gets. Sessions usually contain two or three readings of the same script, and the second reading rarely pops in the same place. Matching the two takes requires aligning level and room character, which takes a few minutes, and the result is normally invisible in a way that no in-place pop repair ever quite manages.

Practice notes that pay off

Plosives are partly habitual, and habits change with feedback:

• Record a practice paragraph with the pop filter and listen back on headphones; most speakers adjust their delivery immediately after hearing one bad pop.
• Notice which words trigger pops for you, often emphasized P and B openings, and practice those transitions.
• Keep the microphone slightly above or below mouth level, where the direct air path is least likely to line up.
• When a take is pop-heavy despite the setup, shorten the distance check first; it is usually the variable that drifted.
• Bank a spare clean take of the script's most pop-prone sentences while the session is warm.

Related guides

Mouth clicks are the sibling impulse problem, with its own manual edit walkthrough. Keyboard noise follows the same source-first logic in removing keyboard noise from audio, and the free-tools comparison covers the cleanup routes that handle the bed around all of it.