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.
|0.5 dB Up||0.5 dB Down||Flat|
The first one plays back a 440 Hz sine tone characterized by a sudden increase in level occurring after 1 second (0.5 dB in this case). The second file introduces a decrease in level by the same amount. The third one is flat.
|0.5 dB Up 0.5 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.
Is AudioCheck free? Not for me. Your support keeps this site running and growing without ads. Every donation gets rewarded with an access to • uncompressed .wav files downloads, for every test • sample rates up to 192 kHz, in the tone generator section • and a suggestion box, on every page.
If you already are a patron, please log in.