Key takeaways
- How to reduce background noise when streaming: fix mic distance, gain and room first, then add OBS filters in the right order, with a symptom table.
The most effective way to reduce background noise when streaming is to fix it before it reaches the software: put the microphone close to your mouth, turn the gain down, aim the mic away from noisy sources and quiet the room. Filters in OBS then clean up whatever is left, and they work far better on a signal that is already clean.
That order surprises people who reach for a plugin first. A filter that has to hide a loud fan, a distant microphone and a boosted gain setting will sound processed, clip the ends of words and tax your PC. This guide walks through the sources of noise, the physical fixes in rough order of payoff, the OBS filter chain, and a symptom table to help you match the sound you hear to its likely cause. It relies on general audio practice and published manufacturer documentation, so check your own microphone’s manual for its pattern and recommended distance.
Find out what kind of noise you have
Noise falls into three families, and the fix depends on which one you are fighting. Steady noise is constant: PC fans, air conditioning, a hum from a power adapter or hiss from a high gain setting. Intermittent noise comes and goes: keyboard clicks, mouse clicks, chair creaks, a notification sound or traffic outside. Room noise is the echo and reverb that make your voice sound distant, even when the room is silent.
Record thirty seconds of silence from your streaming setup with the same gain you use live, then another thirty seconds of you talking. Play both back through headphones. If the silent clip has a constant rushing or buzzing, you have steady noise. If it is clean but the speaking clip has clicks and thumps, you have intermittent noise. If your voice sounds hollow or washed out, you have room noise. Keep these recordings, because they let you compare before and after each change without guessing.
Listen on headphones, not speakers, and make one change at a time. It takes five minutes and saves a lot of tweaking in the dark.
Symptom to cause table
| What you hear | Likely cause | First fix |
|---|---|---|
| Constant rushing or whooshing | PC or desk fan, air conditioning | Move the mic further from the source and closer to your mouth |
| Hiss in silence | High gain, low-level signal | Lower gain and move closer to the mic |
| Low hum or buzz | Ground loop, power adapter, cable | Change USB port, separate the cable from power cables |
| Keyboard and mouse clicks | Mic on the desk, wide pickup | Boom arm, aim the mic away from the keyboard, desk mat |
| Hollow, echoing voice | Room reflections, distant mic | Soft furnishings, closer mic, cardioid pattern |
| Breathing and popping sounds | Mic too close or directly in line | Pop filter, angle the mic slightly off-axis |
| Game or music leaking into the mic | Open speakers | Use headphones, or lower speaker volume |
Step one: placement and gain
Distance is the biggest lever. In ideal open conditions, sound pressure falls roughly by half each time the distance doubles, which is a drop of about 6 dB. That means moving the microphone from 12 inches to 4 inches (a threefold change) raises your voice relative to ambient sound by roughly 9.5 dB, if you leave the gain alone. In real rooms with reflections the exact figure varies, but the direction holds.
| Mic distance from mouth | Relative voice advantage over room noise (idealized) | Practical note |
|---|---|---|
| 12 in | Baseline | Picks up the room as well as you |
| 8 in | About 3.5 dB better | Common desk position, still room-heavy |
| 4 in | About 9.5 dB better | Typical for dynamic mics, watch plosives |
| 2 in | About 15.5 dB better | Strong isolation, adds proximity bass and pops |
The figures follow from a simple distance calculation and assume an idealized setting, so treat them as direction rather than a promise. Use a boom arm or stand to hold the mic steady near your mouth, slightly off to the side or below it, aimed at your mouth rather than at the monitor. A shock mount keeps desk thumps out, and a pop filter softens the bursts from p and b sounds.
Then set the gain. Speak at your normal stream volume and adjust until the OBS meter peaks in the upper yellow region on loud words, well short of the red. If you have to push gain very high to get a healthy level, the mic is too far away, and every sound in the room has come with it.
Step two: pick the right pickup pattern
Most streaming microphones advertise a polar pattern. Cardioid picks up sound from the front and rejects the rear, which is the usual choice for streaming. Omnidirectional picks up everything and is the wrong choice for a noisy desk. Bidirectional and stereo modes are designed for interviews and music.
Dynamic microphones tend to be less sensitive than condensers, which in a noisy room is an advantage, because the mic needs you close to produce a good signal and picks up less of the room. Condensers capture detail and are widely used in quiet, treated spaces. Neither type fixes a loud fan on its own, but a cardioid dynamic mic positioned close to your mouth is generally the most forgiving combination. Confirm the pattern and the recommended distance on the maker’s page.
If your only microphone is a built-in one on a camera, it is usually far from your mouth and picks up a lot of the room. That is one reason many streamers add a dedicated mic even when they have a good camera; if you are choosing a camera for OBS as well, see our webcam picks for OBS.
Step three: quiet the sources
Move the PC if you can. A tower on the floor beside the desk is a classic noise source, and putting it further away or behind the mic’s rear rejection helps. Check the fan curves in your BIOS or software and avoid a constant high speed when the machine is idle. A new or cleaner fan often costs far less than a filter chain.
Keyboards are the next problem. Heavy typing travels through the desk into the mic stand. A boom arm clamped to the desk edge still conducts some of it, so a desk mat under the keyboard and a shock mount help. Clicky or loud switches are noticeable, and a quieter board is the cleanest solution. Close windows, turn off fans that are not required and use headphones so the game audio never leaves the speakers.
Room echo is the last factor. Soft furnishings absorb sound: curtains, a rug, a bookcase, a sofa. You do not need studio foam. Anything that breaks up bare walls near your mouth helps, and recording a short clip before and after shows whether the change is worth keeping.
Step four: build the OBS filter chain
Once the physical setup is as good as you can reasonably make it, add filters to the microphone source in OBS. Order matters, because each filter works on what the previous one produces.
| Order | Filter | What it does | Starting point |
|---|---|---|---|
| 1 | Noise suppression | Reduces steady noise such as fans and hiss | Start with the lightest method that works |
| 2 | Noise gate | Mutes the mic between words | Set the close level just above your room noise on the meter |
| 3 | Compressor | Evens out loud and soft speech | Mild ratio, adjust by ear |
| 4 | Limiter | Stops sudden peaks from clipping | Set a ceiling a few dB below zero |
OBS offers several suppression methods. The lighter ones use little processor power and mainly handle steady noise. Heavier neural methods usually remove more but cost more CPU, and on supported graphics cards a vendor’s own noise removal may be available as well. Which of those fits your PC depends on how loaded it is while gaming, so compare your frame rate and encoder load with the filter on and off.
For the gate, watch the meter while you sit silently, then while you speak softly. Place the close threshold just above the silent level and the open threshold a little higher, so the gate does not chatter. If words are being cut off, lower the thresholds or lengthen the hold time. If noise still leaks between sentences, raise them slightly.
A worked example with stated assumptions
Assume a streamer with a cardioid dynamic mic on the desk about 12 inches from the mouth, a tower fan-heavy PC under the desk, and gain set high to compensate. First, move the mic onto a boom arm at about 4 inches: the idealized calculation says about 9.5 dB of voice advantage, so the gain can come down by a similar amount, which also lowers fan hiss. Second, place a desk mat under the keyboard and aim the mic’s back toward the PC. Third, add light noise suppression and a gate set just above the room level. Fourth, record thirty seconds and compare with the original clip.
Under these assumptions, most of the improvement comes from steps one and two, while the filters do the final cleanup. If you did the filters first, you would be asking them to deal with a much noisier input and would likely hear artifacts on your voice. Change a single assumption, for example a louder room or a condenser mic, and the balance shifts toward more room treatment and stronger gating.
Common mistakes
- Raising gain instead of moving closer. Gain boosts everything, including the noise.
- Using the strongest suppression level by default. Over-processing makes voices sound watery and clipped.
- Putting filters in a random order. Compression before suppression raises the noise before it is removed.
- Mounting the mic directly on the desk. Thumps and clicks transfer straight through.
- Ignoring monitoring. Listen to a recording with headphones before you go live, since the in-game view hides audio problems.
When to stop tweaking and replace or call support
If the noise follows the microphone to another computer or USB port, the mic, its cable or its internal electronics may be at fault. A constant buzz that changes when you touch the metal parts of the case, or a hiss that persists even at very low gain, points the same way. Update the device firmware, try a different cable, and then contact the manufacturer while the product is under warranty.
Consider a different microphone when the room cannot be quieted and your current mic is a sensitive condenser, or when you are relying on a camera’s built-in microphone. Consider a different setup if the noise comes from your own PC and the fans cannot be tuned down. In these cases, a closer dynamic mic or a quieter case usually does more than another plugin. If background audio is leaking from your speakers, switching to headphones fixes it for free.
Related guides
- Hdmi Capture Cards For Streaming From Console
- Streaming Devices With Ethernet Port
- How Much Data Does Streaming Use Per Hour
Frequently asked questions
What is the fastest way to reduce background noise when streaming?
Move the microphone closer to your mouth and lower its gain. Halving the distance raises your voice relative to the room by roughly 6 dB in ideal conditions, which is more than most filters achieve without side effects. After that, switch off noisy sources such as fans and speakers, and add an OBS noise gate or noise suppression filter for what remains.
Should I use noise suppression or a noise gate in OBS?
They solve different problems. Noise suppression reduces steady sounds such as fans and hiss while you talk. A noise gate mutes the microphone between words so low-level sound does not leak through. Many streamers use both, placing suppression first and the gate after it, then adding a compressor and limiter to keep the level even.
Is a dynamic or condenser microphone better in a noisy room?
A dynamic microphone with a cardioid pattern is generally the more forgiving choice, since it is less sensitive to distant sound and is used close to the mouth. Condensers capture more detail and more of the room, so they suit quiet, treated spaces. Placement and gain matter for both types, so check the manufacturer’s polar pattern notes.
Will AI noise removal make my voice sound strange?
It can if set too aggressively. Heavy suppression may clip word endings, create a watery tone or react to sudden sounds. Use the lightest setting that handles your room, keep the microphone close, and compare a short recording before going live. Some methods also use extra processor or graphics power, so check your frame rate after enabling them.
Can a keyboard or mouse click be removed from my stream audio?
Partly. A cardioid dynamic microphone aimed away from the keyboard, a boom arm that lifts the mic off the desk, and a desk mat all reduce the pickup. A noise gate and suppression filter can trim what remains, though loud, sharp clicks are hard to remove without affecting speech. Quieter switches or a separate keyboard position also help.
