Set volume to ~25% before starting.
Hearing nothing below 200 Hz on phone/laptop speakers is normal – small drivers can’t produce deep bass.
Quick answer: Turn your volume to a comfortable low level, then press Left, Right and Both. If sound comes from the wrong side, your speakers are wired or worn backwards – if one side is silent, that channel is faulty. The sweep plays 20 Hz to 20 kHz so you can hear where your hardware (and hearing) roll off.
This tool generates clean test tones directly in your browser with the Web Audio API – no audio files, no download. The left/right check instantly catches the two most common audio faults: a dead channel (blown driver, broken wire, half-inserted plug) and swapped stereo (very common with DIY speaker wiring and some cheap USB adapters).
The frequency sweep is the interesting part: it glides from 20 Hz up to 20 kHz, the full range of human hearing. Small laptop and phone speakers typically stay silent until 200–400 Hz (they physically can't produce deep bass), while good headphones play almost the whole sweep. Where the sound vanishes at the top end depends on both the hardware and your ears – most adults stop hearing between 13 and 17 kHz, which is normal.
How to test speakers and headphones
- Set your device volume to about 25% – test tones are pure and can sound louder than music.
- Press Left – sound must come only from the left speaker or earcup. Then press Right.
- Press Both – the tone should sound centered, equally loud on both sides.
- Try different tone frequencies (low 100 Hz for bass drivers, 1 kHz standard, 10 kHz for tweeters).
- Run the frequency sweep and note where sound appears and disappears – the live readout shows the frequency playing.
Why use the GadgetsFocus speaker test?
- Isolated left, right and center test tones for instant channel checking.
- Selectable tone frequencies from deep bass to treble.
- Full 20 Hz – 20 kHz sweep with a live frequency readout.
- Pure browser-generated audio – works offline, nothing downloaded or uploaded.
- Works with built-in speakers, wired and Bluetooth headphones, and surround setups (front pair).
Honest limitations
- Phone and laptop speakers can't reproduce deep bass – silence below ~200 Hz on small speakers is physics, not a fault.
- If audio comes from the wrong side on Bluetooth earbuds, check they're in the correct ears first – then the balance settings in your OS.
- The top of the sweep tests your hearing as much as the hardware – not hearing above ~15 kHz is normal for most adults.
- Keep the volume moderate: sustained pure tones at high volume can stress small tweeters (and your ears).
Frequently asked questions
Sound comes from the wrong side – how do I fix it?
For wired speakers, the left/right cables are swapped at the amp or the speakers are positioned wrong – swap them back. For headphones, you may simply have them reversed. In software, check the OS balance/spatial settings; some “enhancement” software also swaps or widens channels.
One side is quieter – speaker problem or settings?
First check the OS balance slider (Windows: Sound settings → device properties → balance; macOS: Sound → Output). If balance is centered and one side is still weak here, the driver or wiring on that side is degrading – with headphones, try them on another device to confirm.
Why can't I hear the start of the sweep?
Frequencies below ~60 Hz need larger drivers than laptops and phones have; on small speakers the sweep becomes audible somewhere between 150 and 400 Hz. On decent headphones you should hear (or feel) it from near the start.
Up to what frequency should I hear?
Young ears reach ~18–20 kHz; most adults naturally top out between 13 and 17 kHz. If sound cuts off far earlier on speakers but not on headphones, the speakers' tweeters may be damaged. Bluetooth codecs can also shave the extreme top end.
Is this safe for my speakers?
Yes at sensible volumes – these are the same sine tones audio engineers use. Just avoid blasting long high-frequency tones at maximum volume on small tweeters.
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Last updated: July 11, 2026. Built and tested by the GadgetsFocus team on Chrome, Edge, Firefox and Safari (desktop & mobile). Everything on this page runs locally in your browser — we never see, store or transmit your files.