What the tool does, how to run it, and what to expect from the result.
Press Left, Both and Right: each plays a short chime from that side only, so you hear at once if a channel is dead or swapped. The sweep glides through every frequency people can hear, from 20 Hz to 20 kHz; a buzz or rattle at one point reveals a loose part or a damaged cone. The bass test shows how deep your speakers go, and the phase test catches a speaker wired backwards.
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 sound test without installing anything or signing up.
Short answers for the questions people usually have before trying a utility like this.
Check that the tab is not muted, the right output device is selected in your system sound settings, and the volume is up. On iPhone, the silent switch mutes web audio.
Small speakers physically cannot reproduce much below 150-200 Hz. Try headphones.
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Start at a low volume and turn it up. Sounds are generated in your browser; nothing is recorded.
Left, Right and Both check the channels. The sweep plays every frequency from 20 Hz to 20 kHz: gaps, buzzing or rattles point to a fault. Laptop and phone speakers usually start around 150-200 Hz, so the bass test may be silent on them.
In phase should sound solid and centred; out of phase sounds hollow and wide. If "in phase" sounds hollow, one speaker is wired backwards.