Wrapping power cords and interconnects with copper foil.

. . . and then there is copper adhesive tape from Amazon @ $9.99 for a 12 yard roll.  I think that might be easier to work with than the WalMart roll.  One roll MIGHT do all my power cords.

@tubelvr1 

Just interested, did you wrap all of your cables at once, or was it done progressively?

It is not clear from your description whether your wrapping was floating, or was grounded at one or both ends of the cable?  You did not mention speaker cables?

I would expect the greatest difference to result from wrapping the phono cable, where the signals are miniscule compared with line-level interconnects.  I presume your phono cabling is RCA, not balanced? 

Surely wrapping the cable changes its capacitance, which may be good or bad considered from a system neutrality perspective.

Another cheap treatment for power cords is to snap on ferrite rings at a cost of a few bucks each.  These can really clean up digital noise coming from components, especially if they contain switch mode power supplies (computers, class D amplifiers, etc).

Snake oil. All of it. At best, nothing is happening. More probable is your adding interference. Walk away from this. 

Reading passages from the Bible, Torah, or Koran will have the same effect from my experience or simply burn incense which may have a pleasant psyco- acoustic effect as well.

Reading passages from the Bible, Torah, or Koran will have the same effect from my experience or simply burn incense which may have a pleasant psycho- acoustic effect as well.