= Equal-loudness contour
{wiki=Equal-loudness_contour}
Equal-loudness contours are graphical representations that depict the relationship between sound frequency and the perceived loudness at different sound pressure levels. In essence, they show how the human ear perceives different frequencies at varying volume levels. The concept is rooted in the understanding that human hearing is not equally sensitive across the audible frequency range. For example, at lower sound pressure levels (or volumes), our ears are less sensitive to very low and very high frequencies compared to mid-range frequencies.
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