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Left / Right Speaker Test — Check Stereo Channels

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 focused on the left / right check: press Left and the tone must come from your left speaker only, press Right and it must move to the right one, press Both and it should sit in the center.

A left / right test catches the two most common stereo faults in seconds: channels wired the wrong way around (everything sounds mirrored) and one channel that is silent because of a broken cable, plug or driver. If the tone plays on the wrong side, swap the speaker cables or the balance setting — not your ears.

The tone is generated live by the Web Audio API and steered with a stereo panner, so nothing is downloaded and nothing leaves your browser. When both channels pass, try the bass sweep and pink noise on the full speaker test page.

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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.