Check your left and right channel separation, test the subwoofer, and sweep a 20–20,000 Hz tone to find distortion or shake dust loose — all free, right in your browser. No download, no sign-up.
Tip: for the subwoofer, drag frequency down to 20–200 Hz. Sweep glides from 20 Hz to 20 kHz so you can hear rattles or dead spots. Keep volume moderate to protect your ears and gear.
A speaker that sounds "off" is usually a wiring, balance or driver problem you can pin down in seconds — if you have the right test tone. This free online speaker test does three things other tone generators skip: it plays a tone through only the left or only the right channel so you can confirm stereo separation, it isolates the low end for subwoofer and woofer checks, and it sweeps the full 20–20,000 Hz range to expose rattles, distortion or dead frequencies.
Use it to set up a new surround system, verify a laptop or phone isn't stuck in mono, check a car stereo, or just confirm a speaker is alive before you blame the source. The sweep is also the classic "speaker cleaner" trick — a moving tone helps dislodge dust from cones. Everything runs in your browser with the Web Audio API; nothing is uploaded and there is no software to install.
Frequency starts at 20 Hz, not 0, because a true 0 Hz signal is DC that stresses drivers without making sound. Keep volume sensible: very loud bass at very low frequencies can damage equipment. If a driver rattles, turn down and inspect it.
Click Left Channel or Right Channel to play a test tone through one speaker only, or Subwoofer and drag frequency into the 20–200 Hz range for bass. Use the frequency slider to pick any tone from 20 Hz to 20 kHz, Sweep to glide across the whole range, and Stop when done. Adjust volume anytime.
Click the Left Channel card to play a test tone through only your left speaker, or the Right Channel card for the right. Each card silences the other channel so you can confirm stereo separation is correct.
Click the Subwoofer card, then drag the frequency slider down into the 20–200 Hz range. The low-frequency tone is sent to both channels so your subwoofer or woofer produces it.
The Sweep button ramps a sine tone smoothly from 20 Hz up to 20,000 Hz. Listen for rattles, distortion or dead spots across the range — it is also commonly used to shake dust loose from speaker cones.
No. This speaker test runs entirely in your browser using the Web Audio API. There is nothing to install and no account to create. Any modern browser works — Chrome, Edge, Firefox or Safari.
Yes, with normal volume. The frequency range starts at 20 Hz (not 0) to protect drivers, and we recommend keeping volume moderate. Very high volume at very low frequencies can damage equipment, so use your ears and turn down if anything sounds wrong.