I want to thank y'all for inspiring me to get back into audio after many years. I found this article on the web about power conditioning. It is a little old, but not entirely outdated.
http://www.boundforsound.com/tweak.htmPOINT 1. Transformer based isolation devices are basically useless as AC line conditioners.
POINT 2. Power amplifiers are generally immune to the workings of outboard line conditioners, but respond very favorably to power cords.
POINT 3. Outboard AC line conditioners generally come in two flavors - series and parallel.
POINT 4. Outboard AC line conditioners work best when loaded down with the proper amount of line draw.
POINT 5. If power line conditioning is to be effective, the cords must be oriented to proper polarity.
POINT 6. Power cords make a tremendous difference.
POINT 7. Line voltage.
POINT 8. Dedicated AC lines work.
POINT 9. AC line conditioning comes at all price points.