A 3 dB tolerance is a common figure in frequency response specifications. Some professional systems go beyond by one or two decibels. In some eccentric cases, fractions of a decibel are quoted. This test helps you determine the smallest difference in levels you can detect.
|0.2 dB Up||0.2 dB Down||Flat|
The first one plays back a 440 Hz sine tone characterized by a sudden increase in level occurring after 1 second (0.2 dB in this case). The second file introduces a decrease in level by the same amount. The third one is flat.
|0.2 dB Up 0.2 dB Down Flat|
|Listen to [?] then vote — multiple guesses not allowed (your vote triggers a new draw)|
To pass a blind test, you will need to perform 10 trials at least, obtain a high score and reach a high confidence level: 95% is standard to rate statistical significance. It means that your score outperforms random guesses by 95%. There is still a probability that you just got lucky though, 5%. To reduce such probability to 1%, keep testing until you reached a confidence level of 99%.
If you didn't pass this test, try with a higher level difference. Change the target on the top of this column.
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