The four noise suppression options in Microsoft Teams are not a volume knob for background noise. They are four different instructions about what counts as noise in the first place. Off sends your microphone signal through largely untouched. Low removes steady, predictable sounds. High tries to remove everything that is not a human voice. Auto lets Teams choose between those behaviors based on what it hears around you. Picking the right one depends less on how loud your room is and more on what kind of sound is in it.

Low: for the hum you stopped noticing

Steady background sound is the easiest kind to remove, because it barely changes from one moment to the next. A laptop fan, an air conditioner, the drone of a refrigerator in an open-plan kitchen: all of these have a consistent shape that software can learn and subtract without touching much else.

That is the job Low is designed for. It takes out persistent, low-level noise and leaves irregular sounds mostly alone. The practical effect is that your voice keeps its natural tone, and anything else that is not constant still comes through. That second part is sometimes exactly what you want. Microsoft’s own guidance points to Low as the setting to use when you are deliberately sharing sound that is not speech, such as playing a short piece of music to the meeting, because a more aggressive filter would treat the music as something to delete.

High: speech or nothing

High takes the opposite approach. Instead of asking “what is constant?” it asks “what is a voice?” and suppresses the rest. Keyboard clatter, a dog barking, dishes, a door slamming, paper rustling: these are sudden and irregular, which makes them hard for a simple filter, but a model trained to recognize speech can drop them because they are plainly not speech.

There are two costs. The first is processing power. Microsoft notes that High uses more of your computer’s resources, and on an older or heavily loaded machine that can matter, especially with video and screen sharing running at the same time. The second is that aggressive filtering occasionally clips things you wanted heard: a quiet word at the end of a sentence, a laugh, a colleague speaking from across the room. If people tell you your voice sounds slightly processed or that your sentence endings vanish, High is the first suspect.

If you have never touched this option and want to see where it lives, the walkthrough on how to turn on noise suppression in Teams shows the route through both the app settings and the in-meeting menu.

Auto and Off: the two defaults people misread

Auto is the out-of-the-box choice, and for most people it is a reasonable one. Teams listens to the local environment and decides how much suppression to apply. The trade-off is predictability. If your surroundings change during the day, the behavior may change with them, and you will not get a notification when it does. People who need consistent results, such as someone recording a training session, often prefer to set a level by hand.

Off is not a setting for brave people in noisy rooms. It exists for the opposite case: a good microphone in a quiet space, where any processing can only take something away. Podcasters, musicians and anyone using a studio-style microphone sometimes find their audio sounds fuller with suppression disabled. Teams also offers a separate high-fidelity music mode aimed at performance and teaching, which is a better fit than Off if music is the whole point of the call.

Choosing by situation rather than by habit

A few realistic pairings help more than abstract rules:

• Home office with a fan or heater running: Low, or Auto if you would rather not think about it.
• Shared space with typing, talking and kitchen noise: High.
• Quiet room with a quality microphone: Off, after a test call confirms it sounds clean.
• Playing audio or an instrument to the meeting: Low or the dedicated music mode.

Whichever you choose, check it with the test call feature in the device settings instead of asking the meeting “can you hear me okay?” Colleagues are polite, and the recording is not.

One more detail: on managed work accounts the option may be locked by an administrator, and some certified headsets do their own noise processing before Teams ever sees the signal. If the setting seems to make no difference, the filtering may already be happening in the hardware.

The thirty-second decision

Identify the sound you are fighting. Constant hum means Low is enough. Unpredictable clatter calls for High, provided your computer copes. Silence plus a good microphone earns Off. And if you would rather not decide, Auto handles the everyday cases without fuss.