Geoff Wood wrote:

no "more frequencies" suddenly appear, and nothing is "clearer and
cleaner". It is merely a *minute amount louder* !

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2 Psychoacoustics

2.1 Equi-loudness Curves

The sensitivity of the ear varies with frequency. The ear is most
sensitive to frequencies in the neighbourhood of 4 kHz; sound pressure
levels which are just detectable at 4 kHz are not detectable at other
frequencies. In general, two tones of equal power but different
frequency will not sound equally loud. The perceived loudness of a sound
may be expressed in sones, where 1 sone is defined as the loudness of a
40 dB tone at 1 kHz. Equi-loudness curves at several loudness levels are
shown in Figure 1. *The curve labeled "hearing threshold in quiet"
indicates the minimum level (by definition, 0 sone) at which the ear can
detect a tone at a given frequency.*

http://www.minidisc.org/aes_atrac.html (See page for graphic)

*These curves indicate that the ear is more sensitive at some
frequencies than it is at others.* Distortion at insensitive
frequencies will be less audible than at sensitive frequencies.

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Myke

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