Stereo / Left-Right Audio Test
Verify left, right, center, phase, mono collapse, and balance with generated tones you confirm yourself.
Capability-dependent testPrivacy-first
Tests run locally in your browser. We do not upload keystrokes, pointer paths, or media.
Important
- Results are your listening notes only. Wiring, OS mixers, and Bluetooth profiles can swap channels.
Lower system volume first. Sounds never autoplay. Stop immediately if audio is uncomfortable. High tones and sweeps are optional — use briefly.
Web Audio is not available in this browser.
Your listening notes (local only)
- Audio status
- Ready
- Playing
- No
- Last preset
- —
- Balance
- 0
- Selected notes
- 0
How to use
- Lower system volume first.
- Click a channel or tone button — audio never autoplays.
- Use Stop all sounds anytime; audio also stops when the tab hides.
- Record listening notes locally. The page cannot hear for you.
What the result means
- Notes are your subjective observations only.
- Left/right depends on wiring, OS mixers, and device profiles.
- No automatic pass/fail or medical conclusion is produced.
Limitations
- Cannot measure dB SPL without calibrated gear.
- Bluetooth codecs and spatial audio can alter channels.
- Not a hearing-health diagnostic.
Troubleshooting
- No sound
- Check system output device, browser mute, and that you clicked a play button after a user gesture.
Related tools
FAQ
Is audio uploaded?
No. Tones are generated locally with Web Audio and never sent to a server.