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Bass Test Online — Sweep Your Speakers 20 to 200 Hz

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 low end: press the bass sweep button and a sine tone glides from 20 Hz up to 200 Hz over eight seconds through both channels.

Listen for the moment the sound becomes audible — that is roughly the lower limit of your system. Small desktop speakers typically join in somewhere between 80 and 120 Hz, decent bookshelf speakers around 50–60 Hz, and only subwoofers reach meaningfully below 40 Hz. A sweep also makes rattling grilles, buzzing panels and resonating furniture easy to locate.

Keep the volume moderate: pushing small speakers hard at frequencies they cannot reproduce only produces distortion. The sweep is synthesized locally in your browser — when you are done, the full test also offers per-channel tones and pink noise.

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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.