Well, the results of my power cord upgrade are in. If you had told me five years ago that for under $3K I could own a pair orf loudspeakers that allowed me to hear the difference between brass plugs and copper plugs on the same power cord, I would have probably said that wouldn't be possible for $30K. But here we are. Needing a rather long power cord in order to move my amp nearer to my Walsh 2000s, I had to stick with lower-priced brands. I once bought a pair of ICs from AudioArt Cables, and liked them, so I spoke with Rob Fritz at AudioArt about a 5.5 meter power cord. Since the long run was pricey, I went with the entry-level Wattgate plugs, which are made of brass. While the cord sounded okay, there was a frequent emphasis in high frequency sibilants that was not pleasent, most often on female vocals. I talked to Rob about it, and he suggested I upgrade the cable plugs to copper Furutechs in order to eliminate the issue. I have to admit I was skeptical, but I tried it anyway. Well, eureka! The copper plugs fixed the sibilance issue, and sound really smooth, with nice extension at both ends, improved dynamic slam, and excellent soundstage width. The power cord was a good deal, but I am still shocked that my relatively inexpensive system with my Ohms was able to resolve this tiny difference in the power cord's plugs.