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Compilation of blind test reports
krabapple
post Jan 23 2012, 05:14
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I was wowed when I came across this -- someone went to a lot of trouble to compile most of the print and online audio equipment DBTs since the 90's

first post here:
http://www.head-fi.org/t/486598/testing-au...laims-and-myths

btw pretty sure he's wrong about Meyer & Moran only using CD-sourced SACDs, but I'll correct him on that ;



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icstm
post Feb 20 2012, 15:08
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Sorry to jump into this part of the forum.
But I am interested in this last post that suggests that cymbals produce much of their sound above 20k.
Do we know how much about 22k or 24k?
Also do we know if the ear or our bodies in general respond to this near-ultrasonic energy? Given your non-musical examples, I wonder where nails down the blackboard would sit?
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mzil
post Feb 20 2012, 17:59
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QUOTE (icstm @ Feb 20 2012, 09:08) *
But I am interested in this last post that suggests that cymbals produce much of their sound above 20k.
Do we know how much about 22k or 24k?

Lots. The power is quite strong there, even stronger than in its 5-10kHz range it seems, however the output in the range you ask about would quite possibly be psychoacoustically masked by the equally strong output in the audible octave just below it, which I believe was Mr. Krueger's point:

[You can inspect any of the other musical instruments' spectrums, labeled "Figure #x" in the article I linked to in my previous post, by clicking their hypertext links there, if interested.]

QUOTE
Given your non-musical examples, I wonder where nails down the blackboard would sit?


The irritation of fingers scratched on a blackboard has nothing to do with ultrasonics, it is simply humans' high sensitivity to that audible range (strong around 2-4 kHz), the same range being important for speech intelligibility but also sensing an animal's cries when in distress, even at a great distance*, although the blackboard/nail screech is of course chaotic and annoying noise.

*From an evolutionary stand point, animals most alert to predator attacks, even at a great distance, would be most likely to flee in time or run back to camp to protect their young. They would be Darwin's "fittest" and would breed more of their kind, also equally sensitive to that same frequency range, while the kinds not as sensitive in this range would get eaten, not breed, and die off.

This post has been edited by mzil: Feb 20 2012, 18:45
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