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Headphone Test — Left / Right and Stereo Balance

Test your speakers online: left / right channel tones, a 20–200 Hz bass sweep and pink noise — all generated in your browser.

Left
Right

Pick a test signal. Everything is generated locally in your browser.

Honest note: browsers output plain stereo. Surround setups receive these signals only through your OS upmixing — a true 5.1/7.1 per-speaker check needs the AV receiver's own test signals.

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Result

This page opens the speaker test tuned for headphones: put them on, press Left and the tone must appear only in your left ear, press Right for the right ear, then press Both — the tone should sit exactly in the middle of your head.

Headphones make channel mistakes painfully obvious in games and films, yet they are easy to make: earcups worn the wrong way around, a half-seated plug that drops one channel, or a balance slider nudged off center. If Both sounds shifted to one side, check the system balance first, then the cable and connector.

Tones are generated locally by the Web Audio API and panned hard left, hard right or centered — no files, no uploads. For a deeper check, the full test adds a 20–200 Hz bass sweep and pink noise to judge seal and low-end response.

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Accepted Formats & Rules

  • Left / Right / Both channel buttons routed through a StereoPannerNode, with a visual indicator of which channel is playing.
  • Bass sweep that glides from 20 to 200 Hz over 8 seconds, plus locally generated pink noise for balance and placement checks.
  • Frequency slider from 100 to 2000 Hz that retunes the test tone live while it plays.

Key Benefits

✓ Instant answer: one click plays a clean test tone through the left, right or both channels, so swapped or dead speakers show up immediately.
✓ Real signals, not recordings: every tone, the bass sweep and the pink noise are synthesized live by the Web Audio API — nothing is downloaded or uploaded.
✓ Full low-end check: the 20→200 Hz sweep and adjustable 100–2000 Hz tone reveal where your speakers or subwoofer stop producing audible sound.

Use Cases

  • • Verify a new stereo setup: play the Left and Right tones and catch swapped cables or a dead channel before you screw the speakers to the wall.
  • • Run the 20–200 Hz bass sweep to hear the lowest frequency your speakers or subwoofer actually reproduce — and to hunt down rattling grilles and buzzing furniture.
  • • Play pink noise through both channels to compare speaker balance and placement by ear when arranging a desk or a listening room.