I use straight 12 or 14 gauge lamp cord from HomeDepot. Just make sure your speakers terminals are big enough to latch on to the cord and that no spare strands are touching anything else. The coat hanger reference was to an experiment some guy did to his brother and friends where he substituted wire coat hangers for high end speaker wire and they chose the coat hangers as sounding best in a blind listening test.
I am using Home Depot Speaker wire at present. I have noticed the wire turning green , that is the reason I am considering doing my own .
I do know the Audio Critic made reference to the blind test using coat hangers.Looking inside a speaker cabinet and seeing all those itty bitty wires leaves one to believe any metallic conductor should work.
I will stand on my previous statement that the cables I made sounded much better than the ones I was ussing. Once again I was not expecting any cyhange in sound, but I did hear it. It may be that some of my RCA cable were old to the point of failure . Nevertheless ,as long as a rca cord is not grounded out or the connection bad, it should work just as well as the coat hanger for speaker wire