Re: Power for Audio

TimPerry <timperry@xxxxxxxxxxxxxxxxxxx> wrote:
>
>i have personally had a discussion with a S. Cal Edison engineer: he denies
>that it is possible for "dirty" power to exist. this was in relation to
>frequent cycling of small UPS units.
>we all know better, but it sure didnt get me anywhere.

A scope and a polaroid camera will. "I saw THIS CRAP on my power line!
Fix it!" usually does a lot. Power guys don't think like audio guys. Power
guys don't really pay much attention to line waveforms; they think about
loads only in terms of power factor (ie. load reactance) and not much
else. As loads today are getting more and more bizarre, this is a mistake.

If you get power guys to think about line waveform at all, it's in terms
of THD, rather than individual line harmonics. I'd rather have second harmonic
trash on the power line than tenth harmonic trash, because 120 Hz is less
likely to capacitively couple into my audio than 600 Hz stuff is.

But usually the power guys have no idea how bad the lines are.... they are
under the unfortunate delusion that everything looks like the nice sine
wave in the book... and if they do know how bad they are, they usually don't
understand why that's an issue for us.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
.

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