What was the first power cable that you noticed a difference in the sound?

My first "audiophile" power cords were Kimber Kords, the early ones with the plastic sheathing.  These were a minimal step up from the stock cords but, of course, my system was FAR less revealing then so it's hard to tell just what they did to the sound.  It wasn't until I tried various Electraglide power cords that I heard an obvious improvement.  The Wolff power cords were another obvious improvement over the Electraglides they replaced.  

from  tennisdoc56: By what method/electrical theory does a power cord improve the contractor grade romex in your walls?   Please avoid explanations in biology such as sees, senses, feels, prefers.   Not being sarcastic 

I googled the following:  "acoustical properties of various metal conductors" and over the next 6 pages, I didn't get a single hit that covered, in any manner, the way that each metal affects the sound of the signal that passes through it.   There were entries about sound absorption, sound reflection, which metal is the best conductor of electricity, acoustic properties of commercially available thermal insulators, and the speed of sound in metal/sound waves passing through solid metals.   

Nowhere did I see any mention of how passing the signal through various metals affects the sound.  There was nothing about the warmth of gold, the detail of silver, etc.  Is there respectable research being done in this area; are theories out there relating to this?   I have no idea, but my search didn't yield anything relevant.   I'm not a scientist.  I'm actually quite challenged by modern technology, but I do use the scientific method in my audiophile pursuit.  I LISTEN.  I try different components, cables, connectors, and most recently, slugs (in place of fuses).  I don't know WHY there are such variations in sound between the various metals I've used but, clearly, the addition of different metal(s) in the signal path (and possibly outside in the case of some fuses) can significantly affect the sound.  

Rather than rely on this stance, why don't you simply experiment, and listen.  Do you really think that all those stating the benefits/differences of cables are delusional or just exaggerating?    And please tennisdoc56, don't take this as an attack.  Since the research doesn't appear to be out there, I think we should all do our own.  

bigtwin:  you're absolutely right.  It made perfect sense to me at 2am last night but that would be with a signal passing cable and that's not what was being discussed.  Mea Culpa!