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Discriminative Frequency Training - 2/3 Octave Notches

Switch to : Full Octaves 


Equalization (EQ) refers to the process of altering the frequency response of an audio system or a sound file. EQ can be used for esthetic reasons or to compensate for unwanted bumps or holes in the audio spectrum.

The following files will help you to discriminate missing frequencies across the audible range. By training your ears to recognize those missing frequency bands, you will acquire the ability to locate unwanted frequency dips by ear and find the correct EQ fix in one go.

Training Files

40 Hz 63 Hz 100 Hz 160 Hz 250 Hz 400 Hz
630 Hz 1 kHz 1.6 kHz 2.5 kHz 4 kHz 6.3 kHz
10 kHz 16 kHz

Listen to each file and associate the missing 2/3 octave band with the value of its center frequency.

The Test

40 Hz 63 Hz 100 Hz 160 Hz 250 Hz 400 Hz 630 Hz 1 kHz 1.6 kHz 2.5 kHz 4 kHz 6.3 kHz 10 kHz 16 kHz
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%.

Once you have succeeded in getting a score of 100% without listening to the individual labeled files during the test, your training will be complete!

Let's have a test on a real music signal now...

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Take up the challenge

  • Find the smallest difference in sound levels you can detect. 
    The Level Series:  6dB  3dB  1dB  0.5dB  0.2dB  0.1dB 

  • Find the highest frequency you can reliably hear.
    The Frequency Series:  10kHz 11k 12k 13k 14k 15k 16k 17k 18k 19k 20kHz

  • Find the smallest difference in pitch (frequency) you can hear. 
    The Pitch Series:  50c  20c  10c  5c  2c  1c 

  • Find the shortest timing difference you can reliably hear. NEW
    The Timing Series:  1ms  2ms  5ms  10ms  20ms  50ms  100ms 

  • Find the highest dynamic range offered by your listening environment. 
    The Dynamic Range Series:  36dB  42dB  48dB  54dB  60dB  66dB  72dB  78dB 

  • Do you have the absolute hearing ability? 
    The Perfect Pitch Blind Test:  C Scale  Chromatic 

  • Are your ears sensitive to Absolute Phase? 
    The Absolute Polarity Blind Test:  Here 

  • Can you hear a difference between 16-bit and 8-bit audio files? 
    The 16-bit v/s 8-bit Blind Test

For sound and studio engineers