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For cleaner live-stream audio, first reduce noise at its source and place the microphone close enough to your voice. Then use OBS Noise Suppression for steady, mild noise; add a Noise Gate or Expander if noise is most noticeable between phrases. Record a short test at your normal speaking level before going live: stronger filtering can make speech sound unnatural or cut off quiet words.
Start with the microphone and the noise source
Identify the microphone your stream actually uses. In OBS, check the active mic input; if you use a virtual-microphone app, make sure OBS is listening to that virtual device rather than the physical microphone. A filter cannot reliably fix every noisy room, so reduce avoidable noise at its source where practical—for example, move away from a fan or lower its setting. OBS says its built-in suppression is intended for mild background or white noise and is generally not effective when there is a large amount of noise in a loud room (OBS Noise Suppression Filter).
Make a short local recording and listen at a realistic voice level. Check the start and end of sentences as well as pauses: a voice can sound acceptable during a loud phrase but become muffled or clipped when you speak softly.
Use OBS Noise Suppression for steady, mild noise
OBS Project says its Noise Suppression filter can remove mild background or white noise, including sounds such as a PC fan. OBS documents the feature for Windows, macOS, and Linux. To apply it, open the microphone source’s filters in OBS, add Noise Suppression, and compare a recording with the filter on and off (OBS Noise Suppression Filter; OBS Filters Guide).
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- RNNoise: OBS describes this as the higher-quality option, with greater CPU use than Speex.
- Speex: A configurable suppression method; adjust its suppression level cautiously and listen for changes to the voice.
- NVIDIA Noise Removal: Listed by OBS as another method; it requires the NVIDIA Broadcast SDK redistributable.
Do not assume more suppression is always better. OBS cautions that strong suppression can distort the voice. If consonants sound smeared, speech becomes watery, or quiet words disappear, reduce the effect or address the noise physically instead.
Choose a gate or expander for noise between phrases
Suppression targets background noise, including noise that continues under speech. A Noise Gate or Expander is threshold-based: it reduces or closes the mic signal when the input falls below a chosen level. That makes these options most useful when noise is distracting during pauses, rather than when it remains audible under your voice.
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Noise Gate: reduce the mic when you are not speaking
Add Noise Gate to the microphone source’s filters. OBS advises setting the close threshold above the room-noise level and the open threshold slightly below the voice input level (OBS Noise Gate Filter). The right levels depend on your microphone, gain, room, and speaking volume; OBS’s displayed defaults are not universal settings.
Record a test while speaking softly, pausing, and finishing sentences. If the gate chops off quiet words or sentence endings, lower the threshold or reconsider whether a gate is appropriate. A gate can only respond to signal level; it cannot distinguish a quiet word from a similarly quiet sound based on meaning.
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Expander: turn quieter sounds down more gradually
An Expander lowers sounds beneath its threshold rather than abruptly closing the mic. OBS gives fans and keyboard clicks as examples of quieter sounds it can reduce. A lower ratio produces lighter reduction; avoid setting the threshold so high that it cuts off speech (OBS Expander Filter). Listen for natural pauses and soft syllables in a test recording before using it live.
Optional virtual-microphone processing
NVIDIA Broadcast
NVIDIA Broadcast offers microphone Noise Removal and room-echo removal; echo removal addresses reverberation, a different problem from background noise (NVIDIA Broadcast FAQs). NVIDIA’s setup guide says to select the physical microphone in Broadcast, enable Noise Removal, then in OBS open Settings > Audio > Mic/Auxiliary Audio and choose Microphone (NVIDIA Broadcast). Record with background noise and toggle the effect or its strength to compare (NVIDIA Broadcast App Setup Guide).
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The processing only reaches OBS if OBS uses the NVIDIA virtual microphone. NVIDIA’s FAQ lists Windows 10 64-bit and an RTX 2060, Quadro RTX 3000, TITAN RTX, or higher for Broadcast; hardware, driver, and application requirements can change, so check NVIDIA’s current requirements before installing. If you hear artifacts or the effect does not work as expected, disable overlapping noise-removal effects in OBS or other audio software. NVIDIA notes that combining Noise Removal and Room Echo Removal can reduce noise-removal efficacy while Room Echo Removal is in beta (NVIDIA Broadcast Troubleshooting Guide).
Krisp
Krisp documents a workflow for selecting Krisp Microphone as an OBS Audio Input Capture source, so the voice is filtered before it reaches the stream (Krisp for Streamers and Gamers, updated August 21, 2026). Choose the virtual microphone as the input, make a local test recording, and listen for voice quality and cutoffs before going live. This vendor setup guidance does not establish that Krisp will sound better than OBS or NVIDIA Broadcast in every room.
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Test the whole audio path before going live
- Confirm the input: Identify the mic source OBS is using. If an external processor is active, verify that OBS has selected its virtual microphone.
- Record a baseline: Capture a short sample with your usual speaking volume and the noise present. Listen to it before adding or changing effects.
- Apply one treatment at a time: Try OBS Noise Suppression for steady, mild noise. Use a gate or expander for pauses. If testing virtual-microphone software, route OBS to that device.
- Compare like with like: Record the same passage with and without the effect, at the same mic position and speaking level. Check soft words, sentence endings, pauses, and whether the voice sounds distorted.
- Back off when speech suffers: Lower suppression or threshold settings, remove overlapping processing, or reduce noise at its source. Do not go live with a setting that clips quiet speech.
Troubleshoot common problems
| Symptom | Likely cause | What to check |
|---|---|---|
| Noise is still audible while you talk | A gate only reduces the signal below its threshold; it is not designed to remove steady noise underneath speech. The room may also be too loud for OBS suppression. | Try mild Noise Suppression for continuous noise, reduce the source where practical, and compare a test recording. OBS says suppression is generally ineffective in a loud room. |
| Noise stops in pauses but remains under speech | The gate is working as a gate: it reduces the mic when you are not talking. | For noise under speech, test Noise Suppression; do not expect a gate to remove it. |
| Quiet words or sentence endings disappear | A gate or expander threshold may be too high, or processing may be too aggressive. | Lower the threshold or reduce the processing, then test soft speech and sentence endings again. OBS warns that an expander threshold that is too high can cut off speech. |
| The voice sounds muffled, watery, or otherwise unnatural | Suppression may be too strong, or multiple noise-removal effects may be processing the same signal. | Reduce the effect and disable overlapping suppression in other apps or OBS. Compare recordings with only one noise-removal path active. |
| NVIDIA Broadcast has no effect in OBS | OBS may be using the physical microphone instead of the Broadcast virtual microphone. | In OBS, go to Settings > Audio > Mic/Auxiliary Audio and select Microphone (NVIDIA Broadcast); check that Broadcast is using the intended physical mic. |
| A filter does not help with loud room noise | Software suppression has limits; OBS describes its filter as suitable for mild noise, not a large amount of noise in a loud room. | Reduce the noise source or change the recording environment where possible, then retest with moderate filtering. |
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