Measure it with the test
Open our speaker and headphone test and keep the volume low.
- Play Left, then Right, without touching the volume between them.
- Play Center. It should seem to sit in the middle of your head. If it leans to one side, the two sides are uneven.
- Swap the earpieces: wear the left one on your right ear and play the tones again.
- Note whether the quiet side stayed with the same earpiece or stayed with the same ear.
What the swap tells you
| After swapping | What it means | Where to look |
|---|---|---|
| The same earpiece is still quiet | The fault is in the headphones, the cable or the device's balance | Balance settings and cleaning, below |
| The same ear still hears less | The earpiece is fine. It is the fit, the seal or your hearing on that side | Fit and seal, below |
| Both sides now sound even | The earpiece was seated badly the first time | Refit and retest |
Check the balance setting
A balance slider nudged off centre is the most common software cause, and it survives restarts.
Windows 11: open Settings → System → Sound, click your output device and compare the left and right channel levels. Set them to the same number.
Mac: open System Settings → Sound → Output, select the headphones and centre the Balance slider.
Phones: on an iPhone the slider is under Settings → Accessibility → Audio & Visual. On Android it is usually under Settings → Accessibility, in the audio or hearing section.
Clean the quiet earbud
Earbuds collect wax and dust on the fine mesh over the speaker, and a thin layer is enough to cut the volume on that side. Look at the mesh under a bright light. Brush it gently with a clean, dry, soft toothbrush while holding the earbud mesh-down so loosened debris falls away. Do not push anything through the mesh and do not use liquids on it. Silicone tips can be removed and washed separately, then dried fully before they go back on.
Check fit and seal
In-ear headphones lose bass and volume when the tip does not seal. Ears are rarely the same size, so try a larger or smaller tip on the quiet side only. With over-ear headphones, glasses arms, hair or a worn ear pad can break the seal on one side. Press the quiet cup gently against your head while a tone plays. If it gets louder, the seal is the problem.
Wired and Bluetooth causes
With a wired pair, push the plug in fully and rotate it a quarter turn. Lint packed into a phone or laptop jack stops the plug seating and can weaken one channel. Try the headphones on a second device: if the imbalance follows them, the cable or driver is wearing out.
True wireless earbuds can drift out of sync so that one bud plays at a different level. Put both in the case, close it for half a minute, then remove them together. If that does not help, use the reset procedure in the maker's instructions and pair them again.
When it is not the headphones
If the same ear hears less with every pair you try, and the swap test points to your ear, the equipment is working. A blocked ear canal is a common and easily treated cause, and a doctor or hearing professional can check it. Until then, the balance slider can compensate so that music sounds centred.
Further reference: Official device or browser documentation ↗
Reviewed October 2026 · How we write our guides · Suggest a correction