Fletcher-Munson Curves

Your ears are amazing instruments. And at different volumes you actually hear slightly different frequency curves. A song’s frequency curve will sound different if you play it at a low volume as opposed to a high volume. Ever notice that when you monitor audio at a very low volume it sounds less clear with less high frequency clarity?

“The Fletcher–Munson curves are one of many sets of equal-loudness contours for the human ear, determined experimentally by Harvey Fletcher and Wilden A. Munson, and reported in a 1933 paper entitled “Loudness, its definition, measurement and calculation” in the Journal of the Acoustical Society of America.” ~from Wikipedia.

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