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Definition of Fletcher-munson effect

Fletcher-munson effect Definition from Entertainment & Music Dictionaries & Glossaries
Guitar Glossary
The psycho acoustical phenomenon in which the subjective frequency response of the human ear changes with the audio level. The result of this effect is that a sound played at a lower relative volume appears to lose both low and high frequency response.
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Fletcher-munson effect Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
An equal-loudness contour is a measure of sound pressure (dB SPL), over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. The unit of measurement for loudness levels is the phon, and is arrived at by reference to equal-loudness contours. By definition, two sine waves of differing frequencies are said to have equal-loudness level measured in phons if they are perceived as equally loud by the average young person without significant hearing impairment.

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