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Speaker test: left, right and bass

Check that both speakers work, that left and right are not swapped, and how low your speaker goes. Works with phones, laptops, headphones and Bluetooth speakers.

523HzLeft, right, bass and full-range checks

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How to run the test

  1. 1Set the volume to about half.
  2. 2Tap Left, then Right. Each side should play on its own.
  3. 3Tap Bass sweep to hear how low your speaker goes.
  4. 4Use Full sweep to spot rattles or missing frequencies.

Reading the left / right test

If Left plays from both sides, your device is mono, or mono audio is on in the accessibility settings. If Left comes out on the right, the channels are swapped: check how you wear your headphones or your Bluetooth settings.

Most phones have one speaker at the bottom and use the earpiece as the second channel. One side is usually quieter. That is normal.

What the bass sweep tells you

The sweep climbs from 30 to 150 Hz. Phone speakers usually become audible around 100 to 200 Hz, laptops around 80 Hz, and good headphones go down to 20 Hz.

A buzz at one precise frequency often means something loose: a case, a screw, or dust on the membrane. Try Dust mode on the speaker cleaner.

Questions people ask

How do I test if my speakers are working?

Tap Left, Right and Both. Each should play clearly without crackling. Then run the full sweep at moderate volume and listen for rattles.

Why do I hear the sound on both sides?

Your device plays in mono, or mono audio is on. iPhone: Settings › Accessibility › Audio & Visual. Android: Settings › Accessibility › Mono audio.

Can I test headphones and earbuds?

Yes, at low volume, especially for the full sweep: high frequencies feel much louder in your ears.

Why can I not hear the highest frequencies?

Hearing above 15 to 17 kHz fades with age, and phone speakers drop off there too. That is normal.