Speaker Test – Left/Right Stereo, Bass and Frequency Check
Check that your left and right speakers or headphones are connected correctly, and hear how well they play bass, mids and treble — with tones, pink noise and a full frequency sweep.
Press “Left”, “Right” or “Both” to play a tone on that channel. If the left tone comes from the right side, your speakers or headphones are swapped. Choose bass (60 Hz), mid (1 kHz), treble (10 kHz), pink noise or a sweep to hear the range your speakers can reproduce. Start at a low volume.
How to use Speaker Test
- Set your device volume low.
- Press Left, then Right, then Both.
- Check that each tone comes from the correct side.
- Try bass, mid, treble and the sweep.
- Press Stop or wait for the sound to end.
Left and right channels
Stereo sound sends different signals to the left and right speakers. If they are swapped, music and films still play, but sounds move to the wrong side — very noticeable in games and video calls with spatial audio. Press “Left” and “Right” to check each channel. If the sound appears on the wrong side, swap the cables, wear the headphones the other way round or check the balance slider in your sound settings.
Frequency tests
| Test | Frequency | What to listen for |
|---|---|---|
| Bass | 60 Hz | Deep hum; small speakers may be almost silent |
| Mid | 1 kHz | Clear, even tone — the most sensitive range for ears |
| Treble | 10 kHz | High whistle; older ears may hear it quietly |
| Sweep | 20 Hz → 20 kHz | Where the sound starts and stops |
| Pink noise | All frequencies | Even “rain” sound; useful for balance |
Laptop and phone speakers usually start around 150–200 Hz, so a 60 Hz tone sounds very quiet on them — that is normal. Most adults cannot hear above 15–17 kHz, so the end of the sweep may be silent even when the speaker works.
Distortion and rattling
Raise the volume slowly with the bass tone and the sweep. A buzz, rattle or crackle at certain frequencies can point to a loose part, a damaged cone or a bad connection. Compare both channels: if only one side distorts, the problem is in that speaker or cable.
Protect your hearing and speakers
Always start quietly, especially with headphones. Pure tones at high volume are tiring and can damage small speakers.
More tests
Check your keyboard with the Keyboard Tester, controllers with the Gamepad Tester and your screen with the Dead Pixel Test. The speaker test uses the Web Audio API in your browser — nothing is installed or recorded.
You may also find these free tools useful: Keyboard Tester, Gamepad Tester and Screen Resolution.
Frequently asked questions
How do I test left and right speakers?
Press Left and Right. Each tone should come only from that side; if not, the channels are swapped.
Why can I hardly hear the bass test?
Small speakers in laptops and phones cannot reproduce 60 Hz well. Headphones or larger speakers will.
Why is the end of the sweep silent?
Most adults cannot hear above about 15–17 kHz. The speaker may still be playing.
Does this test work with Bluetooth headphones?
Yes. Connect them first, then play the tones.
Can the test damage my speakers?
Not at normal volume. Start low and avoid loud bass tones on small speakers.
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