Why this tool is useful
Use this test after reconnecting speakers or headphones to confirm that left and right channels are not swapped and both sides produce sound.
Browser & Privacy · runs locally
Stereo Speaker Channel Tester
Play a short locally generated tone through the left, center or right channel to check channel order and audible output.
Ready. Your working data stays in this browser.
How it works
Web Audio generates a brief low-volume sine tone in this tab and applies the chosen stereo pan. The page downloads no sample and never accesses the microphone.
Practical example
Choose Left, run the tone, then repeat with Right. The sound should move to the matching side; Center should be equally audible from both stereo channels.
Validation
The test reports only browser-observable events and measurements; it does not invent hidden hardware health, temperature or manufacturer specifications.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.