Click on the "Play Sample A" and "Play Sample B" button, and guess which is the distorted one (distortion is highly enhanced here).
Note: You need to enable JavaScript

Click to play:
What do you think?

Ready to go?

To start, adjust loudness to normal level: Statistics

Ready to go?

Just this little information we need:

How the test works

A few tips just before we start the test:

It is strongly recommended to use Headphones. A good HiFi System is ok, but small multimedia boxes add to much of their own distortion.

You have to compare two samples: one is the pure linear signal, the other is the the loudspeaker output with enhanced or attenuated distortion. We don't tell you which sample is the distorted one - click "Sample A" or "Sample B" to play them, then make your choice.

It is easy at the beginning - we start with strongly enhanced distortion. If you recognize the distorted sample correctly, we'll make it harder. If you are wrong, we'll go back a few steps. How far can you go down?

Sorry - there is no "I don't know" option. If you are not sure, trust your intuition. You can hear more than you think, so we force you to take a choice. The test takes a few extra steps to weed out "good luck guesses".


  • Trust your feelings! Near your audibility threshold, you can't tell the difference for sure anymore. That's perfectly ok with the test.
  • The test is easier when you listen at higher loudness - but still keep it comfortable for you.
  • Repeat the test to train your ear

An easy example

Click on the "Play Sample A" and "Play Sample B" button, and tell us which is the distorted one. (distortion is highly enhanced here)

Note: if you don't see two buttons "Play Sample A" and "Play Sample B", you need to install Microsoft Silverlight

Click to play:
What do you think?