Turn the volume down
Lower your device volume first, then raise it slowly. The page’s own volume never goes above its safety limit.
Check that your left and right speakers are the right way round, hear a smooth stereo sweep, and sweep from 20 Hz to 20 kHz to find your speakers’ range.
Use the tone generator, bass sweep, polarity check, balance check and loudness ramp. Every sound has a built-in volume limit.
This browser always plays through the system’s default output. Change it in your system sound settings.
The left side plays a lower beep than the right, so swapped channels are easy to hear.
The sound should glide smoothly from the far left to the far right and back, without jumps or a hole in the middle.
Press Mark when the tone appears and when it fades away to see your speakers’ (and ears’) range. Rattles or buzzes at some pitches point to loose parts.
Small speakers usually start around 80–150 Hz; a subwoofer reaches 30 Hz or lower. Pick a frequency to set the tone generator to it.
The label switches every 2 seconds. In phase should sound centred and full; out of phase sounds hollow and spread out. If it’s the other way round, one speaker is wired backwards.
Sit in your usual spot and move the slider until the noise sounds centred. The reading tells you how uneven your speakers are. Double-click the slider to centre it.
A 1 kHz tone rises steadily from −60 dB to the level you choose. Stop it as soon as it sounds loud enough; distortion before the end means the speaker is reaching its limit.
Lower your device volume first, then raise it slowly. The page’s own volume never goes above its safety limit.
Play Left, then Right. The low beep should come from the left, the high beep from the right. Then play the stereo sweep.
Run the frequency and bass sweeps, mark where sound starts and fades, and use the polarity and balance checks for a proper stereo setup.
If the low beep comes from the right, the channels are swapped: check the cables, the speaker placement or the left/right marks on your headphones. If one side is silent, try another cable or port.
Most adults hear up to 14–17 kHz, less with age. Small speakers often start around 80–150 Hz; headphones and subwoofers go much lower. Rattles or buzzing at certain pitches mean something is loose.
In phase should sound solid and centred. If “out of phase” sounds better, one speaker’s wires are reversed. The balance reading tells you how much quieter one side is from where you sit.
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Press Left: a lower beep plays only in the left channel. Press Right: a higher beep plays only in the right. The speaker icon on the matching side lights up. If you hear them from the wrong sides, the channels are swapped.
Every sound passes through one volume stage and a hard limiter that keep it at or below −6 dB of digital full scale, and the default volume is −18 dB. Your device’s own volume still applies, so start low, especially with headphones, and stop a test at any time.
The sweep glides from 20 Hz to 20 kHz on a logarithmic scale, so each octave takes the same time. Press Mark when the tone becomes audible and when it disappears to see the range of your speakers and your hearing. Buzzing at some pitches points to a loose part or a damaged driver.
It plays the same sound on both sides and flips the right side’s polarity every 2 seconds. Correctly wired speakers sound fuller and centred when the label says “In phase”. If it’s the other way round, swap + and − on one speaker.
Pink noise has equal energy in every octave, so it sounds even across the range. It’s used to compare speakers, set levels and check balance.
In browsers that support choosing an audio output, the Output device list lets you send the test to any connected device. Device names appear once the site has been allowed to use a microphone. Elsewhere, change the output in your system sound settings.
No. Every tone, sweep and noise is generated in your browser as it plays; nothing is downloaded or uploaded.
Free, safe volume limit, nothing to install.