Short answer: stereo audio has two separate channels, left and right, so sounds can come from different directions. Mono audio has one channel, so every speaker or earbud plays exactly the same sound. Mono is useful if you have hearing loss in one ear or only use one earbud, but it removes the left/right effect from music, films and games.
What is mono audio?
Mono (short for monaural or monophonic) means all sound is mixed into a single channel. If you play a mono signal through two speakers, both speakers play the same thing, so the sound seems to come from a point in the middle. A phone call, a voice recording from one microphone and many older records are mono.
What is stereo audio?
Stereo uses two channels: one for the left speaker or ear and one for the right. A mixing engineer can place each instrument somewhere between the two. In a typical song the vocals sit in the centre, while a guitar might be a little to the left and a keyboard to the right. Stereo is what gives music width and lets you hear in a game where footsteps are coming from.
Mono vs stereo: the differences
| Mono | Stereo | |
|---|---|---|
| Channels | 1 | 2 (left and right) |
| Sense of direction | None – everything is centred | Sounds can be placed left, right or anywhere between |
| Best for | Speech, calls, podcasts, one-ear listening, hearing loss in one ear | Music, films, games, anything where space matters |
| If one speaker or earbud fails | You still hear everything | You miss whatever is only in the dead channel |
| File size (uncompressed) | Half of stereo | Twice mono |
When should you turn on mono audio?
- You only use one earbud – for example while driving or at work – and do not want to miss half the mix.
- You have hearing loss in one ear. Mono makes sure both ears get the full signal.
- One speaker is broken and you need a temporary fix until you can repair it.
- You listen to speech (podcasts, audiobooks) and stereo effects are distracting.
Keep stereo on for normal music, film and gaming. If you turned mono on by accident, a left right audio test will play the same sound in both ears when you press Left – that is the giveaway.
How to turn mono audio on or off
Windows 11
Open Settings → Accessibility → Audio and switch Mono audio on or off. You can also set the left/right balance in Settings → System → Sound, select your output device and adjust the left and right channel sliders.
Windows 10
Open Settings → Ease of Access → Audio and use Turn on mono audio.
Mac
Open System Settings → Accessibility → Audio and turn on Play stereo audio as mono. The left/right balance slider is in System Settings → Sound → Output.
iPhone and iPad
Go to Settings → Accessibility → Audio & Visual. Here you will find the Mono Audio switch and a Balance slider. Make sure the slider is in the middle unless you need it otherwise.
Android
The menu names vary by phone. On Google Pixel look in Settings → Accessibility → Audio adjustment for Mono audio and Audio balance. On Samsung Galaxy go to Settings → Accessibility → Hearing enhancements for Mono audio and Left/right sound balance. If you cannot find it, search the Settings app for "mono".
How to check if your audio is mono or stereo
- Open our left right audio test.
- Press Left. In stereo you hear sound only from the left speaker or ear.
- If the sound comes from both sides, your device is set to mono, you are using a mono speaker (most single Bluetooth speakers and many phones in portrait mode are mono), or the app you are using outputs mono.
Is a single speaker mono or stereo?
Most small Bluetooth speakers, smart speakers and soundbars without separate drivers play in mono, even if the music is stereo – there is simply no physical left and right. Some larger single speakers have two drivers and a stereo mode, but the separation is small because the drivers are close together. To hear real stereo you need two speakers placed apart, or headphones.
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Read guideFrequently asked questions
Is mono or stereo better?
Stereo is better for music, films and games because it gives direction and space. Mono is better when you listen with one ear, have hearing loss in one ear or only care about speech.
Does mono audio make sound louder?
Not really. Both channels are mixed together, so each ear gets the full content, but the overall level is about the same. Some sounds that were only on one side may seem quieter because they are now shared between both ears.
Why does my phone sound mono?
Check the Mono audio switch in accessibility settings. Many phones also have only one speaker, or use the earpiece as a weaker second speaker, so the stereo effect is small when you hold the phone upright.
Can I convert mono to stereo?
You can play a mono recording in both ears, but you cannot recover real left/right information that was never recorded. "Fake stereo" effects only add delay or reverb.