Human hearing: Frequency dependent hearing threshold

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The human hearing is particularly sensitive in the range of 700 - 6000Hz. This means that even a low sound pressure is sufficient to perceive these frequencies.

hearing    

In the range of lower frequencies, however, a higher sound pressure is required.

From 8000Hz we also need higher sound pressure to hear it at all.

  

In the area marked in red we do not hear. That means that even if you deliver a signal at 63Hz and 30dB, we can't hear it. Only at 40dB and above do we begin to catch up with the hearing threshold and we hear that.

How about the pain threshold? ==>