Why do we consider frequencies above 70.7% of the maximum gain for ban

1.	Why do we consider frequencies above 70.7% of the maximum gain for bandwidth?
Answer» If the gain falls to 70.7% of maximum gain, the ear can not detect the change in the intensity of sound. If the gain falls below 70.7%, the ear will hear distortion. Hence the range of frequencies above 70.7% of the maximum gain is called as bandwidth.

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