How to check if microphone automatic gain is too aggressive

Your voice gets louder and quieter on its own, or the fan and room noise seem to rise whenever you pause. Automatic gain control may be turning the microphone level up and down too strongly. It can also be a setting in your computer, headset, or calling app.

Compare the same microphone with Auto volume on and off using the Microphone Test. The comparison helps you tell whether the test's automatic adjustment changes your voice, or whether to look elsewhere.

Compare automatic gain on and off

1. Open the Microphone Test and press Start microphone. Allow microphone access when your browser asks.
2. Choose the microphone you use for calls from the device list. Sit in the same position for each recording, and use headphones if your speakers might feed sound back into the mic.
3. For a clear comparison, turn Noise suppression and Echo cancellation off, or leave them in the same state for both recordings. Turn Auto volume off. Speak a short sentence at your usual volume, then press Record 5 seconds and play it back.
4. Turn Auto volume on and repeat the exact same sentence at the same distance. Compare the signal meter, waveform, and playback. Keep the microphone position and room noise as steady as you can.

Use your normal speaking voice. Shouting or moving closer to the mic between recordings makes the comparison less useful. The test's meter shows the loudest input level in dB, but it is not a calibrated measurement of how loud your voice is in the room.

What the result means

Room noise swells during pauses

If the fan or other quiet sounds become much louder with Auto volume on, the automatic adjustment may be raising the microphone level when your voice stops. This is a common sign of aggressive gain control. Try disabling automatic gain in the app you use for calls, or lower the input level after turning automatic gain off.

Your voice pumps or changes level

If a steady sentence sounds like it repeatedly grows and shrinks only with Auto volume enabled, the adjustment may be reacting too strongly to changes in your voice. A brief change after you start speaking is not necessarily a problem. Focus on changes you can hear during normal speech, especially if words fade or the background surges between them.

The sound is distorted with both settings

If playback crackles or sounds harsh with Auto volume both on and off, the problem may be input clipping, a device's built-in processing, or a damaged connection. The test can show that the captured sound is poor, but it cannot identify exactly where distortion begins. Check the computer and app settings before assuming the microphone is broken.

There is little or no difference

The browser's Auto volume switch may not control the processing that is affecting your microphone. An operating system, headset, USB interface, or calling app can change the signal before or after the browser receives it. Continue by checking the settings for the app where you hear the problem.

How to reduce unwanted automatic gain

1. Check the app's microphone settings. In the calling, recording, or game chat app, look in its audio settings for automatic gain control, auto-adjust microphone volume, or a similar option. Turn it off for a test, then repeat the conversation or recording that sounded wrong.
2. Set a steady input level. On Windows 11, open Settings › System › Sound › Input, select your microphone, and adjust its input volume. If the device has an Audio enhancements setting or a specific automatic gain option, turn it off temporarily to compare. The available controls depend on the microphone and its driver.
3. Check the Mac input level. Open System Settings › Sound › Input, select the microphone, and adjust Input volume if that control is available. macOS does not show a manual input level for every microphone, so check the app's own audio settings too.
4. Keep the microphone closer and lower the level. Place it a consistent distance from your mouth, then reduce the input level if loud words distort. A closer mic lets you use a lower level and can make room noise less noticeable, but do not let the mic touch your face or clothing.
5. Compare another input. Test a built-in microphone, headset mic, or USB microphone using the same sentence. If the problem follows one device across apps and computers, its own processing or hardware may be responsible.

When the microphone may be faulty

If the recording still distorts with automatic adjustments disabled and the input level set lower, try the microphone on another device. A problem that follows the mic can point to a damaged cable, connector, or microphone electronics. For a headset under warranty, contact the seller or manufacturer. If the fault is in a laptop's built-in microphone, ask a repair shop to check it before replacing parts.

Why the browser test may not match your call

Automatic gain control adjusts the digital level of the microphone signal. Different browsers and devices may apply different audio processing, and some microphones process sound internally before it reaches the browser. A calling app can also apply its own adjustment. The test is useful for a controlled comparison, but it cannot reveal every setting in the audio path or measure the microphone's physical gain directly.

The Microphone Test runs in your browser, and recordings you make with it stay on your device.