I'd like to suggest that like electronic systems, at some point low
frequencies "become audible" because the amplitude reaches a point where
the system overloads and the low frequencies are distorted and produce
harmonics that are audible. Play 10Hz through a small speaker and you
hear very little until the amplifier or speaker clips, at which time the
harmonics of 10Hz are suddenly very audible. Being our listeners own
"equipment" is the source of the distortion, the experience is slightly
different, but I think the analogy still applies.
Kalman Rubinson wrote:
>> Michael Forrest <michael_forrest at lineone.net> wrote:
> > One curiosity of low frequency sound is the steep growth of loudness, ie
> > inaudible to subjectively loud over a quite small range of physical
> > intensity.
>> This is not surprising if one looks at the progressive rise in threshold as
> one lowers the frequency.