Sound Only Coming From One Side in Windows 11? Fix the Left/Right Balance

Sound is only coming out of one earbud or one speaker in Windows 11, even though both work fine.

Why: The left/right balance has been knocked to one side, or a mono setting is forcing everything into one channel. These are software settings, so they’re quick to even back up.

Fix 1: Even up the left/right balance

1. Go to Start → Settings → System → Sound.
2. Under Output, select the device you’re using (headphones, speakers, or Bluetooth).
3. In Output settings, open Volume and make sure the Left and Right channels are set to the same level (typically both at 100).

Fix 2: Turn off Mono audio if you didn’t mean to use it

Mono audio collapses both channels into one — handy with a single earbud, but unexpected otherwise:

1. Settings → System → Sound and check for a Mono audio toggle in the Output area — turn it Off for normal stereo.
2. Also check Settings → Accessibility → Audio and make sure Mono audio there is Off.

Fix 3: Confirm a stereo audio format

If balance is even but it’s still one-sided, the device may be set to a mono or odd format:

1. In Settings → System → Sound, select your output device.
2. In Output settings, open Format and make sure a stereo option is selected (not a mono format).

If it’s a wired headset, also try the earbuds in another device and reseat the plug fully — a partly inserted 3.5 mm jack often plays one side only.

FAQ

It’s a Bluetooth headset that’s one-sided. Same settings apply: check Left/Right balance and stereo format for that Bluetooth device, then re-pair it if needed.

I want everything in one ear on purpose. That’s exactly what Mono audio in Settings → Accessibility → Audio is for — leave it on.

Sources: Microsoft Support — Fix Bluetooth audio only playing in one channel · Microsoft Support — Make Windows easier to hear