Power cord? Why?


I see a lot of posts regarding power cords. I would like to know what sonic difference they actually make. Could anybody explain this in a simple way?

Thank you
cfmartind362
Parameters:
When doing a cable A-B if one cable allows you to hear: The background insruments as obvious as the presentation in the foreground,the singer's voice is so well articulated every word is crystal clear,the quality of the instruments being used as well as the projected technique and skill of the virtuoso,ambient reflections do the size of the hall. Why stop there? One cable allows your transistor amp to run 12 degrees cooler while there is a 6db increase in volume measured at the speaker because its design does not generate loss. The people who have just experienced the demonstration could care less about "published results" they have just received a healthy dose of reality. Now I have a question for you. Do you think there experiences in life that are self evident?
all experiences can be broken down into apriori fragments or so kant would say. and, as descartes would say, apriori is self evident. Thus, would the essence of experience be lost if there is no self evidence?
So putting all things aside and the nit pick. I was a industrial as well as a medical x-ray technician for a number of years. So all this metal wire which is cryoed, constant casted, solid vs. stranded, welded, soldered and crimped still has stress fractures in the wire and in the weld or solder joint. I can't even believe that some companies have gone to welding the wire to plugs. So as the metal expands and contracts with temperature variations and humidity, as it is bent in the application it is meant for, as it ages and becomes more brittle. What does all this falderal buy us. Not a darn thing except something neat to talk about.
Michaelhwolf:
You are starting to get it! The answer has nothing to with the things you just outlined. Try this: take all your audio cables and tie them together while still connected to your equipment. Play your system, the hazy sound you will hear is field contamination. Would it not be correct to say the field inside the cable is just as degrading as the field that bleeds to the outside? Now, there is a solution to this problem but that is for another time.
Corona, I understand what you are saying although you are very vague in your answer. So what is the point? Yes I know their is a solution, which hopefully will soon be a patented process.