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Units of Acoustical Loudness

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Description:

The loudness level of a sound is expressed in the dimensionless phon scale and can only be measured by a subjective hearing test. The loudness level amounts to "n" phon when it is judged by a normal observer under standardized listening conditions to be as loud as a pure tone of frequency 1,000 Hz consisting of a plane progressive sound wave coming directly in front of the observer, with the sound pressure = "n" decibels.

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