OBS Audio Filters Guide: Noise Suppression, Compression, EQ, and Gate Settings

Overview

OBS applies microphone filters from top to bottom in the source’s filter list. A practical voice chain often begins with noise suppression, followed by an expander or noise gate, EQ, compression, and a limiter. The exact order can vary with your problem, but the principle is consistent: remove or reduce unwanted sound first, shape the voice second, and control peaks last.

Before adding filters, improve the input itself. Put the microphone close enough to produce a healthy signal without forcing the gain high, aim it toward your mouth according to its pickup pattern, and keep the capsule away from fans and direct keyboard noise. In OBS, speak at your normal streaming volume and watch the Mic/Aux meter. Your regular voice should leave headroom for louder words, laughter, and reactions rather than sitting at the maximum level.

To add a filter, open the Audio Mixer in OBS, select the three-dot menu for your microphone, choose Filters, and use the plus button under Audio Filters. Name filters by purpose, such as “Voice suppression” or “Main compressor,” so you can understand the chain later. If you are also changing resolution, frame rate, or bitrate, use the best OBS settings guide for Twitch separately; audio problems are easier to diagnose when you change one group of settings at a time.

What each OBS audio filter does

• Noise suppression: Reduces steady background sounds such as a fan, air conditioner, or computer hum. Strong suppression can make speech sound thin or artificial, so use the lowest setting that solves the problem.
• Expander: Lowers quiet sounds below a threshold without cutting them as abruptly as a gate. It is often a natural choice for reducing keyboard or room noise between sentences.
• Noise gate: Mutes or reduces the microphone when the signal falls below a threshold. It can be effective, but an aggressive gate may remove word endings or quiet speech.
• 3-band EQ: Adjusts broad low, mid, and high ranges. Use it for small tonal corrections, not as a replacement for microphone placement.
• Compressor: Reduces the difference between quiet and loud speech. It helps a stream sound more consistent, but too much compression raises room noise and can make the voice tiring to hear.
• Limiter: Prevents sudden peaks from becoming painfully loud or clipping. Keep it near the end of the chain and leave a little safety margin.

Checklist by scenario

Start with one scenario that matches your room and voice. Add only the filters you can evaluate. If a setting makes the voice worse, undo it rather than compensating with another aggressive filter.

Quiet room with a reasonably consistent microphone

1. Skip noise suppression if your recording is already clean. Unnecessary processing can remove natural detail.
2. Add a compressor with a moderate ratio, such as 3:1 or 4:1. Begin with a threshold that reduces louder phrases by roughly 3–6 dB while you speak normally.
3. Use a limiter near the end of the chain. A starting ceiling around -1 dB can provide protection without making the voice noticeably quieter.
4. Record 30 seconds of normal speech, a loud reaction, and a quiet sentence. Listen for pumping, dullness, or sudden volume changes.

Noisy room or constant computer fan

1. Reduce the physical noise first: move the microphone closer, lower unnecessary gain, reposition the fan, or use a quieter room when possible.
2. Add noise suppression and select a moderate starting strength. If your OBS version offers more than one suppression method, test each with the same recording rather than assuming one is best for every voice.
3. Follow suppression with an expander. Start with a ratio around 2:1, a short attack, and a release long enough to avoid chopping off the ends of words. Adjust the threshold until room noise falls between phrases but quiet speech remains audible.
4. Add light compression only after the background noise is under control. Compression applied too early or too heavily can bring the noise back up.

Keyboard, controller, or desk noise

1. Use microphone placement before processing: keep the keyboard outside the microphone’s most sensitive direction, use a boom or stand to reduce desk vibration, and speak toward the intended pickup side.
2. Try an expander before a hard gate. A starting ratio around 2:1 to 4:1 can reduce low-level clicks while preserving a more natural transition into speech.
3. If you use a noise gate, set the close threshold below your quiet speaking level and above the idle keyboard level. Test words that begin and end softly, including names and short responses.
4. Use a limiter after compression so laughter or an unexpected shout does not create a sharp peak.

Deep, boomy, or muffled voice

1. Move slightly farther from the microphone or reduce input gain if proximity is creating excessive low-end energy. Do not solve every tonal issue with EQ.
2. With OBS’s 3-band EQ, make a small low adjustment first. If the result becomes thin, return part of the change rather than adding large high-end boosts.
3. If the voice still lacks clarity, try a small mid or high adjustment while monitoring on headphones and speakers. The goal is intelligibility, not brightness.
4. Use moderate compression after EQ and compare the processed recording with the unprocessed version at the same listening volume.

Inconsistent volume or animated delivery

1. Check the microphone position and speaking distance before changing thresholds.
2. Use a compressor with a ratio around 3:1 or 4:1. Lower the threshold gradually until normal speech receives consistent, visible gain reduction.
3. Set attack and release by listening: a very fast attack can soften consonants, while a very slow release can make the level move unnaturally after loud words.
4. Add a limiter last and keep monitoring for clipping. If the limiter is constantly active, reduce the microphone level or ease the compressor instead.

Quick settings reference

What to double-check

Use a repeatable audio test instead of judging the microphone only while live. Record normal conversation, a deliberately quiet sentence, a louder reaction, keyboard or controller sounds, and several seconds of silence. Listen with headphones first, then check speakers or a phone. Ask whether words are understandable at a comfortable volume, whether the background disappears between sentences, and whether loud moments remain controlled.

Check the complete mix, not only the microphone in isolation. Game audio, alerts, music, and voice chat should not compete with speech. If your voice sounds fine in a recording but gets buried on stream, the issue may be the balance between sources rather than the microphone filters. Review the broader Twitch stream quality checklist when you need to evaluate audio and video together.

Also confirm that OBS is using the intended microphone and that no second application is applying additional processing. Duplicate filters, operating-system enhancements, virtual mixers, and voice-chat effects can make troubleshooting confusing. Change one setting, record again, and keep notes of the values that worked.

Common mistakes

• Using a gate to hide a loud room: A gate only acts when you are not speaking. Room noise that overlaps your voice will remain, so improve placement or use careful suppression.
• Setting suppression too aggressively: Metallic, underwater, or choppy speech usually means the filter is doing too much. Reduce its strength and address the noise at the source.
• Compressing before controlling noise: Compression can raise quiet background sounds along with quiet speech. Suppress or expand first when the room is noisy.
• Boosting EQ instead of fixing distance: Large boosts increase unwanted noise and reduce headroom. Start with microphone position and small cuts.
• Copying someone else’s exact thresholds: Thresholds depend on microphone sensitivity, gain, distance, room sound, and speaking style. Use values as starting points, not universal answers.
• Testing only during a live broadcast: A short local recording is safer and easier to compare. Keep a backup chain before experimenting.
• Ignoring the audience mix: A clear microphone can still be hard to understand if gameplay or alerts are too loud. Review the full scene output.

When to revisit

Recheck your OBS audio filters whenever you change microphones, move your desk, add a boom arm, alter gain, install a virtual audio device, or start streaming in a different room. Revisit the chain after adding a fan, changing keyboard switches, introducing background music, or changing your speaking style. Seasonal room changes can matter too: heating, cooling, open windows, and a different desk position may add new noise.

Before your next stream, run this practical checklist:

1. Confirm the correct microphone is selected and positioned consistently.
2. Record normal speech, quiet speech, a loud reaction, silence, and typical desk noise.
3. Check suppression and gating for missing word beginnings or endings.
4. Check compression for a steady level without audible pumping.
5. Check the limiter and mixer for peaks, clipping, or constant activation.
6. Listen to the complete stream mix with game audio, alerts, and music enabled.
7. Save a working profile or note the filter order and values before making changes.

OBS processing options and filter behavior can change as software develops, so validate this workflow against the OBS version you use at least twice a year. For related setup decisions, compare your audio work with the budget streaming setup guide and use the Twitch bitrate and OBS settings calculator for video configuration. A microphone does not need to be expensive to sound clear; it needs a controlled input, modest processing, and a test routine you are willing to repeat.