" a psycho-acoustic of equivalent loudness, the need for which arises from the different sensitivity of the ear to differnet frequencies. The loudless level in phons of a pure tone is the intensity (in dB above reference level) of a pure tone 1000c/s pure tone asessed (as the modal value of judments by 'normal' observers) as being equally loud." [1]


  1. Broughton WB. Glossarial Index. Acoustic Behavior of Animals. Acoustic Behavior of Animals. Elsevier; 1963.

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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith