Audio peaks on loud words? Fix your mic before a webinar

Your voice sounds fine until you emphasize a word, laugh, or speak more loudly. Then the audio crackles, gets harsh, or seems to break up. That can happen when the microphone input is overloaded, or when your webinar app changes the sound.

Test the microphone while speaking at your loudest expected volume. The Microphone Test shows an input meter and waveform, and lets you record a short sample so you can hear whether the distortion is already present before you join the webinar.

Test the microphone at your normal speaking distance

1. Open the Microphone Test and press Start microphone. Allow microphone access when your browser asks.
2. If the device list shows more than one microphone, select the one you plan to use for the webinar.
3. Speak normally, then say a few sentences at the loudest volume you expect to use. Watch the signal meter, its loudest level in dB, and the waveform.
4. Press Record 5 seconds and repeat a sentence with a strong word or emphasis. Play the recording back and listen for crackling, fuzziness, or a sudden change in tone.

Keep the microphone and your position consistent while testing. If you move close to the mic for the test but sit farther away during the webinar, the result will not match what listeners hear.

What the result means

The loud words sound clear in the recording

The microphone can capture your voice without obvious distortion in this test. If it peaks or crackles only in the webinar, check that app's selected microphone and audio processing. The app may be using another input or applying automatic gain, noise reduction, or other processing.

The recording sounds harsh when you raise your voice

The signal may be clipping. Clipping happens when the input is too strong for the recording system to capture cleanly. A loudest level close to 0 dBFS, the digital system's maximum level, is a warning sign, especially if the sound is flattened or crackly. A browser meter cannot tell you exactly where distortion began inside the microphone's electronics.

The meter jumps sharply when you speak loudly

A large jump suggests that your input level changes a lot with your voice. Move the mic slightly farther away, lower the input volume, or check whether automatic volume control is changing the level. Repeat the test after each change.

The meter looks steady, but the recording still distorts

A steady meter does not rule out distortion. The microphone capsule, a headset cable, an adapter, or processing between the microphone and browser could distort the sound before the meter displays it. Try another microphone or connection to narrow down the cause.

How to fix audio peaking

1. Lower the microphone input level. On Windows 11, open Settings › System › Sound › Input, select the microphone, and reduce its input volume. On a Mac, open System Settings › Sound › Input, select the microphone, and lower its input volume if that control is available. Test again using your loudest speaking voice.
2. Move the mic farther away. Start around 6 to 10 inches from your mouth, slightly to one side rather than directly in front of it. Keep the same distance when you speak loudly. A pop filter can help with blasts of air, but it does not fix an input level that is too high.
3. Use the microphone's own gain control carefully. Some USB microphones and audio interfaces have a physical gain knob. Turn it down a little, then repeat the test. Avoid changing several gain controls at once, since that makes it harder to tell which change helped.
4. Check which microphone the webinar app uses. Choose the same device you tested, rather than relying on an automatic selection. Close other calling or recording apps that might be using the microphone, then check the test again.
5. Compare audio processing settings. In the Microphone Test, try turning Auto volume off and on to see whether it changes the result. In the webinar app, compare its automatic gain or noise reduction settings if it offers them. Processing can help speech sound consistent, but it can also react badly to sudden loud words. For more on this, see how to check if microphone automatic gain is too aggressive.
6. Reconnect or replace the connection. For a USB mic, try a different port and connect it directly instead of through a hub. For an analog headset, check that the plug is fully seated and try another compatible jack or adapter.

Make one change at a time, then repeat a short recording. Leave some headroom: the loudest words should stay clear rather than reaching the digital maximum. Do not turn up speaker volume to fix a microphone input that is too quiet or distorted. Speaker volume affects what you hear, not what the mic captures.

When the microphone may be faulty

Test at a lower input level and at a slightly greater distance. If loud words still crackle in the browser recording, test the microphone on another computer, or test a different microphone on this one. If the same mic distorts across devices, inspect its cable and connector. A damaged cable or microphone may need replacement or repair. If it is under warranty, contact the seller or manufacturer before opening it.

Why the webinar can sound different from the test

The test checks the microphone input in your browser. Your webinar app may apply its own gain control, noise suppression, echo cancellation, or audio compression. Other people may also hear a different result because of their headset, speakers, or network conditions. Make a short test call or recording in the webinar app before the event, and listen at the same speaking volume you plan to use live.

The test recording stays on your device. Nothing you record is uploaded.