Rare card
Equal-loudness contour
- Value
- 50 W
- Attack
- 257
- Defence
- 205
- Players
- 0
An equal-loudness contour is a measure of sound pressure level, 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.
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