Test your speakers
Check stereo routing, bass and polarity. See which surround channels your browser exposes and play each available output.
Start at low device volume. Stop if the sound is uncomfortable. Do not turn up quiet or inaudible tones.
Polarity check
Compare at the same volume. In phase should sound centered and fuller. Inverted polarity can sound diffuse or thinner, especially in the bass. This comparison is subjective.
Surround channels
Ready
Audio off
Audio is generated locally with Web Audio. Use your system sound settings to select the output device.
A speaker test helps you check the path from your browser to the speakers before listening, editing or joining a call. Start with low device volume and select the output you intend to use in your system sound settings. Play Left and Right separately. The named physical speaker should produce the short tone. Both sends the same tone to both sides, making it easier to notice a missing connection or an uneven balance setting.
For a useful comparison, sit near your normal listening position and temporarily disable virtual surround, mono mixing and strong equalizer effects. A stereo center signal should seem to come from between the speakers when their placement and levels are reasonably balanced. This is a subjective check, so moving your chair or turning your head may change the image. Check cables and output routing before treating an unusual result as a speaker fault.
The bass check sweeps from 20 to 200 Hz. The full logarithmic sweep moves from 20 Hz to 20 kHz over twenty seconds, with a live frequency readout. Listen at a modest level for obvious rattles or interruptions. Small speakers may reproduce little low bass, and the room can make some tones much stronger than others. Do not turn up the volume to make a quiet extreme frequency audible.
The polarity comparison plays a low tone with identical channels, then lets you invert one side. In phase should normally produce a fuller, more centered result. If the inverted version sounds substantially stronger, check your wiring and playback processing. Reflections and speaker placement can complicate the impression, so this is a starting point for troubleshooting rather than an automatic diagnosis. Switch equipment off before inspecting or changing speaker wiring.
The surround section reads the maximum channel count exposed by the current browser output. When more than two channels are available, numbered buttons let you send a short tone to each one. Match those numbers to your receiver or interface configuration; the page cannot infer physical positions. A stereo-only result describes the browser path, not every capability of your hardware. All signals are generated locally without an upload or account. Use the related channel, headphone and microphone tests to check the rest of your setup.
FAQ
Why does my surround system show stereo only? +
The browser reports the channels exposed by the current operating system output. A surround receiver may be connected while the selected browser output is stereo. Check system audio format and output settings.
Can this identify my surround speaker positions? +
It can send a tone to each available numbered channel, but physical positions depend on your output mapping. Confirm each position against your receiver or interface configuration.
How can I check for speakers wired out of phase? +
Compare In phase with One channel inverted from a position between the speakers. The in-phase signal should usually sound more centered and fuller. Room reflections and processing affect this comparison. Power off equipment before changing wiring.
Why does the bass change as I move? +
Reflections and room modes can reinforce or cancel low frequencies at different positions. Compare from your normal listening position and avoid judging the whole system from a single tone.
Does this calibrate my speakers? +
No. It is a playback check without a measurement microphone. It does not measure sound pressure, frequency response or room correction.