Left and right
Play each side separately. The left test should be heard from the left output and the right test from the right output.
LEFT / RIGHT / STEREO
Speaker & Headphone Test
Test left, right, and both stereo channels with browser-generated sound, then run a simple stereo sweep.
Start with your system or device volume low. Raise it gradually only as needed. The app volume control is relative digital gain, not a calibrated loudness measurement.
Current testReady
Test tone440 Hz sine
Output routeSystem default
App version0.1.1
LEFTExpected left speaker or ear
RIGHTExpected right speaker or ear
LeftCenterRight
Ready. Start with your system volume low, then choose a channel test.
What this speaker and headphone test checks
The app generates a short stereo test tone inside your browser and pans it to the left channel, both channels, or the right channel. It can help you verify basic audio output routing for speakers, headphones, earbuds, or earphones without requesting microphone access.
Both channels
Play both to send the same centered signal to the stereo output. With balanced headphones, it should usually sound centered between the ears.
Stereo sweep
The four-second sweep moves the same 440 Hz tone from left to center to right, back through center, and to left again.
Speakers, headphones, earbuds, and earphones
The browser sends the same stereo signal to the current system/default audio output. Whether that output is built-in speakers, wired headphones, Bluetooth earbuds, or another device is controlled outside this page by your operating system and browser environment.
How to interpret common results
Left plays on the right: your headphones may be reversed, a cable or adapter may swap channels, or system/audio-routing settings may differ from what you expect.
One side is silent: check balance settings, plugs and adapters, Bluetooth connection, the physical speaker or earbud, and the selected system output.
Both sounds centered: that is consistent with the browser sending the same signal to both stereo channels, but it is not a frequency-response or quality certification.
Why there is no automatic pass or fail
A web page can generate and route digital audio, but it cannot know what you physically heard. This app therefore reports what it is playing and leaves the listening observation to you instead of inventing a hardware score.
Volume and hearing boundary
Start with the device volume low. The app uses a conservative default digital gain and short test sounds, but it cannot measure real-world sound pressure at your ears and cannot label a setting as acoustically safe.
What this test does not measure
This is not a calibrated sound-level meter, hearing test, audiogram, frequency-response analyzer, latency test, surround-sound tester, or speaker/headphone quality score. It verifies basic browser-generated stereo output behavior only.
Privacy and local behavior
The test tone is generated by this page. Speaker & Headphone Test does not request microphone permission, record audio, upload test audio, or save a test history. Shared Mycelgrid website services are covered by the Mycelgrid Privacy Policy.
Audio output versus audio input
This app tests sound leaving the browser. To test whether sound is entering the browser through a microphone, use Microphone Test.
Why do I hear nothing?
Check the system volume, mute state, selected operating-system output, browser or tab audio controls, cable or Bluetooth connection, then try a channel again.
Can this page choose my headphones automatically?
No. The core test uses the current browser/system output route. Output-device selection support varies by browser and is not required for this test.
Does a successful left/right test prove my headphones are good?
No. Correct channel routing does not certify frequency response, distortion, sensitivity, fit, wireless stability, or overall audio quality.
Is this a hearing test?
No. It does not measure hearing thresholds or provide medical or audiological results.
Read the testing guide for stereo pan behavior, browser audio routing, volume boundaries, and troubleshooting.