With a bit of guidance from yours truly, Robert Brook has carried out some interesting experiments involving the electricity that feeds his stereo.

These are his findings.

Posted on his blog:

A GUIDE FOR THE BUDDING ANALOG AUDIOPHILE

Power Management: Suggestions and RESULTS!

I expect to add some comments of my own down the road.

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FURTHER READING

Unsolicited Audio Advice

My Stereo (and Thoughts on Equipment)

Making Audio Progress 

Basic Concepts and Realities Explained