Quick answer
What Left Right Speaker Test tells you
Verify that stereo left and right channels are routed in the expected direction.
- Observed here
- Left-only tone, Right-only tone, Centered tone.
- How to interpret it
- Left and right buttons route a short tone to the corresponding browser audio channel. Hearing it on the expected side is your observation; channel mixing or routing can change the physical output.
- Important limit
- Results reflect events and values exposed by this browser.
- Data handling
- Test values are calculated in this browser. Device Test Bench does not store a test result or create a device fingerprint.
Useful next comparison: Compare each side with mono audio and spatial processing settings checked, changing only one setting at a time.
Understanding the result
What a result means
A left-only tone should be heard from the physical left channel and a right-only tone from the right. A centered tone heard on both sides helps distinguish a channel swap from a completely silent output.
Confirm the pattern by repeating left-only tone. Results reflect events and values exposed by this browser.
How to use this test
- Read the privacy and compatibility notes.
- Start the test and interact only inside the marked test area.
- Repeat the action several times and compare the live indicators.
- Use the troubleshooting section before deciding that hardware is faulty.
What this test checks
- Left-only tone
- Right-only tone
- Centered tone
- Immediate stop
What this test cannot check
Results reflect events and values exposed by this browser.
This test does not certify hardware or replace professional inspection.
Physical speaker placement and operating-system balance affect the result.
Common problems and troubleshooting
Verify speaker placement, operating-system balance and cable orientation before changing application settings. Compare headphones with speakers to determine whether the reversal follows the output device or the system route.
- Repeat the same observation. Focus the test surface and repeat “Left-only tone” three times under the same conditions.
- Change one condition. Compare “Right-only tone” after changing only the relevant port, connection, browser setting or application.
- Rule out focus or interception. Close overlays and reserved shortcuts, keep the page visible and confirm that the live indicator changes during the action.
- Keep the result within its limit. Results reflect events and values exposed by this browser.
If the same pattern remains across relevant applications and connections, give the manufacturer or a qualified technician the repeatable observations instead of a guessed fault label.
Browser compatibility
StereoPanner is supported by current Web Audio implementations, but mono hardware, accessibility mono-audio settings and downstream receivers can combine the channels after the browser output.
| Browser | Reference status | Evidence basis | Version | Notes | Checked |
|---|---|---|---|---|---|
| Chrome | Supported | Expected baseline | Not recorded | Feature detection is authoritative; permissions, platform and device support can change availability. | 2026-08-27 |
| Microsoft Edge | Supported | Expected baseline | Not recorded | Feature detection is authoritative; permissions, platform and device support can change availability. | 2026-08-27 |
| Firefox | Partial | Expected baseline | Not recorded | Feature detection is authoritative; permissions, platform and device support can change availability. | 2026-08-27 |
| Safari | Partial | Expected baseline | Not recorded | Feature detection is authoritative; permissions, platform and device support can change availability. | 2026-08-27 |
Privacy information
Test values are calculated in this browser. Device Test Bench does not store a test result or create a device fingerprint.
The public analytics allowlist does not accept pressed keys, typed text, pointer coordinates, media labels, device IDs, recordings, video frames or controller input. Test results are not written to LocalStorage.
Primary technical references
These specifications define the browser signals used by this test. They document web-platform behavior; they do not certify a particular device.
Frequently asked questions
Is this Left Right Speaker Test free?
Yes. The test works without an account, download or payment.
Is my test data uploaded?
Test values are calculated in this browser. Device Test Bench does not store a test result or create a device fingerprint.
Does this result prove my hardware is faulty?
No. It shows what the browser can observe. Repeat the test, compare another browser or device, and seek qualified support when the result matters.
Turn this result into a useful comparison
A working indicator or an unexpected event is only a starting point. Choose a plan to compare another application or connection and record what changed.
- Plan a Silent or One-Sided Audio Check — Compare the selected audio route, channel position and another output with low-volume playback and a printable evidence record.