audibility curve

audibility curve

[‚ȯd·ə′bil·əd·ē ‚kərv]
(acoustics)
The limits of hearing represented graphically as an area by plotting the minimum audible intensity of a sine wave sound versus frequency.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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This is confirmed by audibility curves (see Figure 1) that show the lower harmonics on a bigger horn are at a disadvantage at lower volume levels and distance.