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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: Oh and while you're at it...Posted by clarkjohnsen on: 12/26/2011
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...I hope y'all are attending to AC polarity alignment, else many of your decisions may be erroneous. I've written so much about this perfectly audible phenomenon that I don't feel like doing it any more, so I point you to an excellent comprehensive article, beginning with an excerpt.
WHAT YOU NEED TO BE AN OBJECTIVE SCIENTIST. Almost all of your audio equipment has a transformer in it that serves as a source of power for the circuits inside. Not all manufacturers hook up their transformers so as to minimize voltage leakage to the chassis, otherwise called the "chassis to ground potential". One can measure this by purchasing some of the most expensive objective testing equipment known to man and Julian Hirsh. What you will be measuring is the amount of voltage running around in the chassis of your audio stuff. The preferred voltage is the lowest voltage, which will save you from making dreadful subjective decisions.
http://www.boundforsound.com/tweak.htm
Note: You can also use a DVM, as you will learn.
Just one thing he omits: The two legs of a split-240 feed are in opposite phases, so watch out!
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