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| | Fletcher-Munson CurvesOur sensitivity to sound depends on its frequency and volume. Human ears are most sensitive to sounds in the midrange. At lower volume levels humans are less sensitive to sounds away from the midrange, bass and treble sounds "seem" reduced in intensity at lower listening levels.  Fletcher-Munson Curves for phon levels of 0, 10, 20, 30, 40, 50,...120 Curves originally obtained by two Bell Lab scientists. ReferenceH. Fletcher and W. A. Munson, "Loudness of a Complex Tone, Its Definition, Measurement and Calculation", The Journal of the Acoustical Society of America -- July 1933 -- Volume 5, Issue 1, p. 65
  
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