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Subwoofer Test — Can Your Sub Really Play 20–80 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 subwoofer range: run the bass sweep and pay attention to the very first seconds, when the tone climbs through 20–80 Hz — the band a subwoofer exists for.

A healthy sub plays evenly through its range: the sweep should rise in pitch without sudden jumps in loudness, dropouts or chuffing from the port. A gap in the middle of the sweep usually points at a crossover set wrong between the sub and the main speakers; a boom at one single note hints at room resonance — try moving the sub away from the corner.

One honest note: your browser outputs plain stereo, so a dedicated LFE channel cannot be addressed directly — the sweep reaches the sub through your system's bass management. The signal itself is synthesized locally and plays through both channels, which is exactly what bass management expects.

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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.