Headphones Left and Right Test
A left/right test plays a tone in one channel at a time so you can confirm that the expected ear receives it. This helps reveal swapped connectors, balance settings, mono audio, or one silent channel.
Run the Left/Right Speaker Test →Common causes
Loose plugs, partially inserted adapters, channel-balance settings, mono-audio accessibility options, Bluetooth profiles, damaged cables, and mislabeled earbuds can alter stereo routing. Content itself may also be mono, so use a controlled channel test.
- Loose plugs
- partially inserted adapters
- channel-balance settings
- mono-audio accessibility options
- Bluetooth profiles
- damaged cables
- and mislabeled earbuds can alter stereo routing. Content itself may also be mono
- so use a controlled channel test.
Try these checks in order
- Step 1. Lower volume first, connect only the headphones you want to test.
- Step 2. disable spatial effects temporarily. Play the left tone, then the right tone.
- Step 3. note where each is heard. Reseat the plug, inspect balance and mono settings.
- Step 4. repeat on another device if a channel remains missing..
Change one thing at a time and repeat the browser test. That makes it easier to identify which permission, connection, or routing change actually restored the signal.
What the browser test can confirm
The browser test can generate known left-only and right-only signals and help you compare perceived routing. It cannot measure acoustic output, hearing sensitivity, driver matching, distortion, or electrical continuity.
Limits and privacy
No microphone is used. Tones are generated in the browser; protect your hearing by beginning at a low volume.
A successful browser result means the expected event or stream reached this page during the test. It is useful evidence, but it is not a repair, calibration, warranty, or manufacturer certification.
Related guides
Ready to verify the result?
Run the relevant Device Check tool after completing the steps above.
Run the Left/Right Speaker Test →