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Acoustics — Normal equal-loudness-level contours
a) the sound field in the absence of the listener consists of a free progressive plane wave;
b) the source of sound is directly in front of the listener;
c) the sound signals are pure tones;
d) the sound pressure level is measured at the position where the centre of the listener's head would be, but in the absence of the listener;
e) listening is binaural;
f) the listeners are otologically normal persons in the age range from 18 years to 25 years inclusive.
The data are given in graphical form in Annex A and in numerical form in Annex B for the preferred frequencies in the one-third-octave series from 20 Hz to 12 500 Hz, inclusive, in accordance with ISO 266.
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