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Well, yahbut...

I still don't see any examples of feedback in living organisms extending to frequencies above a few tens of Hz. Think about a cat attacking a bird. In mid-spring he will have to adjust his attack as the bird takes flight. Human reaction times (at least in relation to driving) are usually quoted as around 0.25 to 0.5 seconds. Even if we give the cat a full order of magnitude advantage (just to be *really* safe), we are still only talking about a maximum of 20 to 40 Hz.

So that seems interesting. Unless you can find some example of reaction times (feedback) much, much faster than 50 mS, it would seem that feedback as used in living organisms is used only *below* the audio range. Maybe that's the principle that should be adopted for audio electronics as well...

Best regards,
Charles Hansen

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