Podcast recording noise: what to check first

A fan, air conditioner, computer, or street outside can leave a steady hiss or rumble under your podcast. You may not notice it while recording, but it can become obvious when you turn up a quiet voice or edit pauses.

Check the room before you start. TooLab’s Noise Meter uses your microphone to show a sound level in decibels, so you can compare the room before and after a change. It is a useful check, not a calibrated studio measurement.

Check the noise in your recording space

1. Open the Noise Meter on the computer and allow microphone access when the browser asks.
2. Sit in your usual recording position. Keep the microphone and computer where they will be during the podcast, then watch the reading for a short stretch without speaking.
3. Note the typical quiet reading, then check again while the computer fan, air conditioner, or other suspected source is running. Compare the same setup rather than comparing different devices.
4. Turn off or move one suspected source at a time, wait for the reading to settle, and compare. This helps identify which change makes the room quieter.
5. Use the Microphone Test to record a short sample and listen for the noise in the actual microphone signal. A room reading alone cannot show how your recording will sound.

Do not move the microphone closer or farther away between meter comparisons. Its position and input settings affect the reading, even when the room itself has not changed.

What the reading means

The reading stays fairly steady

A steady level usually points to continuous background sound, such as ventilation, a computer fan, or traffic. Try switching off one source at a time. If the level falls when a device stops, you have a useful lead on what to change.

The reading jumps now and then

Intermittent sounds may come from a refrigerator, a vehicle outside, footsteps, or a device that cycles on and off. Watch for a repeatable pattern, and listen to a microphone sample to check whether those sounds are prominent in the recording.

The meter looks quiet, but the recording has hiss

The meter and recording test may process microphone input differently, and microphone sensitivity varies. A quiet room reading does not rule out hiss from the microphone, cable, input circuit, or a high recording gain. Listen to the recorded sample at a normal playback level before changing your setup.

The reading changes when you speak

That is expected. Your voice is sound reaching the microphone. For a room-noise check, stay quiet while you observe the reading. To judge the recording, listen to a sample that includes both your voice and a pause.

How to reduce noise before recording

1. Move the microphone closer to your mouth. A closer speaking position lets you capture more voice relative to room sound. Keep a comfortable distance and speak across the microphone rather than directly into it if plosive pops are a problem.
2. Switch off the nearest noise source. Pause a desk fan, close a window, or move away from an air conditioner if you can. Change one thing at a time and recheck the same position.
3. Keep the microphone off vibrating surfaces. A stand on a desk can pick up typing, bumps, and computer vibrations. Try a stable stand or shock mount, and avoid touching the desk while recording.
4. Check the selected microphone and input level. On Windows 11, open Settings › System › Sound and choose the intended device under Input. On a Mac, open System Settings › Sound › Input. Set the level high enough for clear speech, but do not raise it so far that room hiss becomes prominent.
5. Check microphone permission. In Windows 11, go to Settings › Privacy & security › Microphone. On a Mac, go to System Settings › Privacy & Security › Microphone. Make sure the recording app or browser you are using has access.
6. Make soft furnishings work for you. Curtains, a rug, or a bookcase can reduce some reflections, which are echoes of your voice bouncing around the room. These do not remove low mechanical hum, so deal with the source when possible.
7. Record another sample after each change. Use the same microphone position and speaking distance. Check that your voice remains clear and that the noise has not simply been made quieter along with your voice.

When the noise may be in the equipment

If the room is quiet but a sample still has a persistent electrical buzz, crackle, or hiss, test the microphone with another USB port or compatible device. For an XLR microphone, check the cable and connection, and test a different cable if available. A noise that follows one microphone across devices suggests a microphone or cable problem. If it follows the computer input, check the input or interface. Replace a damaged cable, and contact the manufacturer or a repair shop if the microphone itself appears faulty.

Use the meter for comparisons, not certification

A browser Noise Meter cannot promise an exact acoustic measurement. Phone and computer microphones have different sensitivities, and device processing can change the level the browser receives. Treat the number as a relative guide: compare readings on the same device, in the same place, with the same microphone and settings.

For a podcast, the useful question is whether a change makes the recorded voice cleaner and easier to edit. The Microphone Test can make a short recording that stays on your device, so you can listen to the result before opening your podcast software.