Stereo sound test

Play the left and right speakers separately to find out which one is quiet.

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There is no play limit. Run the test as many times as you need.

How to run the test

  1. Hold the phone sidewaysTurn it the way you would to watch a video, with the volume at about half. For headphones, put both sides on.
  2. Play each sidePress Play left, then Play right. Each should come from one side only, at a similar loudness.
  3. Run Auto-alternateIt plays left then right once and asks what you heard, so you get a plain verdict.

What the result means

You hearLikely causeWhat to do
Left, then rightStereo is working.Nothing. If music still sounds wrong, check the equaliser.
Right, then leftThe phone is upside down, or headphones are on the wrong ears.Rotate the phone or swap the earbuds and run it again.
One side quietA blocked or wet grille on that side.Clean it, or run the water eject tool with that speaker down.
Both sides from the middleMono audio is on, or the phone has one speaker.Switch off mono audio in accessibility settings.
NothingSound is going to another device, or media volume is at zero.Switch off Bluetooth and raise the volume while a sound plays.

Why one speaker goes quiet

Most phones have two speakers: one on the bottom edge and one in the earpiece. They rarely fail together, so when one side is weaker the cause is usually local to that grille.

The commonest cause is a blocked mesh. The earpiece collects skin oil and the bottom grille collects pocket lint, and both muffle the sound gradually. Water does the same thing suddenly, sitting on the mesh until it is shaken out or dries.

Settings come next. A left/right balance slider that has drifted off centre, or mono audio switched on, changes what each side plays in every app. Hardware faults are the least likely cause and show up as silence or crackle that survives cleaning and a restart.

Guides by problem

Thirteen guides in four groups. Each group has one to start with.