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


I have bought six or seven different power cords, none over $500 and have noticed little or no change in the sound of my system. All the cables are 12 gauge or bigger.  Without talking about cables made with unobtainium, where did you start hear a difference.
 

Thanks.

128x128curiousjim
Post removed 

Not sure why all my post stating facts were removed by the moderators. No offensive language, no name calling just facts. Oh well. 

@jacobsdad2000 

Not sure why these discussions elicit such vitriol from the non believers. If it works for you, great! Enjoy! If it doesn't, Great! Think of the money you saved! But why these discussions devolve into cheap shots is just bizarre.

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