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How to Use This Test

  1. Put on your headphones or position yourself between your speakers
  2. Click the Play button below to start the test
  3. Listen carefully – you should hear "Left" only from the left, "Right" only from the right
  4. If both ears hear the same, you may have mono audio or a wiring issue

✓ Expected result: Clear left/right separation · ✗ Problem: Hearing both channels in both ears

🎧 Stereo Test — Left and Right Audio Test

Run a stereo audio test to check left/right sound, channel balance, and speaker wiring.

No microphone access needed — all audio is generated locally.

Keyboard: L/R/B = channels, 1/2/3 = modes, Esc = stop

Frequency440Hz
Left Channel
Right Channel
🎧 Use headphones for best results
About

This is a free stereo channel test tool. Test your left/right speakers, headphones, or soundbar. Uses the Web Audio API — works offline as a PWA. All audio is generated locally in your browser.

What This Test Detects

✓Channel Balance

Verifies left and right channels are working independently

✓Mono Audio Issues

Detects if both channels are playing identical audio

✓Wiring Problems

Identifies reversed or incorrectly connected speaker cables

✓Dead Channels

Finds completely silent left or right channels

💡 Frequently Asked Questions

What is a stereo test?▼
A stereo test checks whether your playback setup sends separate audio to the left and right channels. It can reveal swapped wiring, mono output, dead channels, and channel-balance problems.
How do I run a left and right audio test?▼
Play the left signal and confirm it comes only from the left speaker or earcup, then repeat on the right. Use the Both control to compare overall volume and tone.
Why do I hear both test signals on both sides?▼
Your device may have mono audio enabled, an adapter may be combining channels, or the source may be incorrectly wired. Check accessibility audio settings and try another cable or output.

Left and right channels correct but video still feels off? Run the audio latency test to check sound delay and AV sync.