Orchid XP v3 wrote:
> andrel wrote:
> 
>>> Oh... no, not really. I mean, sound vibrations are really, *really* 
>>> tiny. (Think about it; even when the sound is turned up painfully 
>>> loud, the speaker cones move by such a tiny amount you can't even see 
>>> them move at all!)
>>>
>> have you taken into account that the overlap in frequency resolution 
>> of your ears and eyes is very small? You can not hear anything below 
>> 20 Hz
>> or see anything above 50 Hz.
> 
> And when I start up the engine of my car, the various parts move far too 
> fast for the eye to follow. But you *can* see the blur of moving 
> objects, and there is little doubt that they're moving. ;-)
Why do you think that those frequencies are far above 50 Hz?
What sound does your motor make? Can you find the base frequency on your 
keyboard?

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