From: "Gregg N" 


"Frank Haber"  wrote in message
news:41f555d9{at}w3.nls.net...
> A dial tone is much too low for a computer fan's rpm, unless it's turning
> really slowly.  It could just be something really close to the blades
making a
> little pulse as each passes, like a strip of cardboard in your bicycle's
> spokes when you were a shaver.

The fan speed range according to Antec's FAQ is 900 to 3800 rpm. A dial
tone has 440 Hz component. I was only estimating though.

Gregg

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