Speaker Test: left, right, bass and full range

How to run the speaker test

You don’t need anything installed. Open the page, find a reasonably quiet spot, and work down the buttons in order. Here’s what I’d do:

1. Set the volume around half and take off any case that covers a grille.
2. Tap Left, then Both, then Right. On a laptop or a pair of desk speakers the beep should obviously move. Hold a stereo phone sideways and you’ll hear it jump from one end to the other.
3. Play Bass, Mid and Treble. Each one beeps for a couple of seconds. Bass on a phone is going to sound small, that’s just physics. Mid and Treble ought to be clean and steady.
4. Start the sweep. It begins as a low hum and ends as a thin whistle. The moment you lose it, tap the button.
5. Do it again after cleaning. If you’ve just run the cleaner, a second pass shows you whether it actually helped.

What each part of the speakers test tells you

Left and right speaker test: why it’s worth doing

People swap cables, wear headphones backwards, and set up desk speakers on the wrong sides all the time, and you’d honestly never notice with most music. A left and right speaker test settles it in five seconds. It’s also the fastest way to spot a dead driver. If Left plays and Right is silent on a laptop, you know straight away which speaker to look at, instead of guessing from a vague “the sound is a bit off”.

One thing to know: lots of cheaper phones have a single loudspeaker, so Left and Right come out of the same hole. That’s not a fault. On phones with stereo speakers, the earpiece at the top doubles as the second channel.

Why treble is the bit to watch on a wet or dusty speaker

A droplet or a layer of lint in the mesh works like a little blanket over the speaker. It soaks up the high notes first, so bass and mids sound roughly normal while the top end goes flat and dull. That’s why the 8 kHz beep and the sweep are the most telling parts of this online speaker test. If treble on one side is clearly duller than the other, clean that side. The phone speaker cleaner on the homepage has water and dust modes; run it, then come back and check speakers again.

Is the sweep testing the speaker or my ears?

Bit of both, honestly. Young ears hear roughly 20 Hz to 20 kHz, and the top end slides down as we get older, which the Wikipedia piece on hearing range covers well. Plenty of adults stop hearing anything above 15 or 16 kHz, and that’s completely normal. Small phone speakers also roll off hard at the bottom, so the first few seconds of the sweep are quiet on a phone.

So don’t chase 20 kHz. The comparison that matters is one side against the other, and before against after. If your left speaker fades at 14 kHz and your right gives up at 9 kHz, the right one has a problem, whatever your own hearing limit happens to be.

How the tones are made

Every beep is generated live in your browser through the Web Audio API, so there’s no audio file to download. Left and Right use a stereo panner pushed fully to one side, which means the signal really does go to just that channel. The sweep is logarithmic: it takes as long to get from 20 to 200 Hz as from 2,000 to 20,000 Hz, which lines up with how we actually hear pitch.

All of it is a plain sine wave. There’s nothing in the signal except the one frequency, so if you hear a buzz or a rattle, it’s coming from the speaker or the device, not from the test. The scope above the buttons draws the exact wave that’s being played.

Keep the volume sensible

Steady tones wear on your ears faster than music does. Keep it moderate, especially in headphones, and never wear earbuds while a cleaning cycle runs. For context, NIOSH puts its recommended workplace limit at 85 dBA averaged over eight hours, and every extra 3 dB halves that safe time, as the CDC’s page on noise and hearing loss explains. A test takes seconds. No need to crank it.

Test speakers on headphones, laptops and Bluetooth

The speaker tester works on whatever is playing your audio. With headphones, Left and Right confirms the cups aren’t swapped and both drivers are alive. With two Bluetooth speakers in a stereo pair, it tells you which is which. On a laptop, the bass beep is a quick way to find a rattle in the case. And if a Bluetooth speaker got caught in the rain and now sounds muffled, put the grille face down, run the cleaner’s Water Eject mode, then come back and test speakers again to compare.