What the tool does, how to run it, and what to expect from the result.
The page asks the browser how many output channels your system reports and shows a button for each: front left, front right, centre, subwoofer (LFE) and the surround pair on 5.1, plus rear speakers on 7.1. Each plays pink noise from that one speaker, so a swapped wire or a wrong receiver channel map is obvious. Stereo systems get left, right, bass, sweep and phase tests.
A quick way to understand who this helps, what it solves, and where it connects next.
Gamers, PC builders and anyone checking a device before a warranty claim.
Using the speaker test without installing anything or signing up.
Short answers for the questions people usually have before trying a utility like this.
Browsers expose the channel count your operating system reports. Set the output to 5.1 or 7.1 in Windows Sound settings or macOS Audio MIDI Setup, then reload the page.
The LFE channel carries only low frequencies, and many receivers send it to the subwoofer only when bass management is on. Check the subwoofer setting and crossover.
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Start at a low volume and turn it up. Sounds are generated in your browser; nothing is recorded.
Your audio output reports stereo (2 channels). To test a 5.1 or 7.1 system, set the output device to surround in your OS sound settings and reload; browsers only expose the channels the system reports.
In phase should sound solid and centred; out of phase sounds hollow and spread. If "in phase" sounds hollow, one speaker has its + and − wires reversed.