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Very good questions, only 9 is a bit stupid...

1)about how many "hair" per freq. group?
At least two.

2)do these regenerate?
No, but can't be shure as some people have hair growing out of their ear.

3)why do the high freq. "hair" go out 1st with time?
The one's in that range are thin and brittle and susceptable to wear and tare.
(It seems we live longer these days than nature intended.)

4)whats their bandpass characteristics?
Wide band. Neighboring frequencies also cause the hair to resonate.
I don't know if you have ever seen the mechanical indicators used to indicate a generators output frequency, they work in a similar fashion. This bell shaped response curve is also observed in certain measurements to determine noise and distortion

5)are they located in group or evenly distributed on the surface of their location?
I don't know, my quess it's not evenly distributed since the sensitivity for various frequency regions differs. More hairs for the midrange so it seems. (The distribution on the eyes retina isn't even either.)

6)how do they couple to the neurons?
Pull out a noisehair and you'll know how.

7)do they exhibit extended decay/ringing to waves?
Yes, but I'll doubt it matters. Inner ear is filled with fluid to transmit the signal more efficient. It also act as dampening.

8)how does the inner ear canal resonate and how is that reflected in the "hair" group population/coupling?
Sound is transmitted through the fluid. The complete structure is more or less like a transmissionline curled up. (Seen that shape somewhere in a clossy speaker folder)

9) why dont i know nothing about this and yet spend 1000s on gear and music?

Different hardwiring in the brain perhaps?

Frank



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