Loudness Level

The Loudness Level of a sound is measured by making a subjective comparison between the loudness of the sound and that of a pure tone of specified frequency that seems equally loud. The Sound Pressure Level of the pure tone in phons is then called the Loudness Level of the sound.

See: Equal Loudness Contours. Compare: Hearing Level, Noise Level, Perceived Noise Level, Sound Level, Sound Power Level.