Ok, so I got the speaker cables yesterday, hooked them up and was playing some classic vinyl recordings when my wife came home for dinner. I didnt mention the change in cables. We sat down to dinner, with the music playing. Part way through dinner the wife commented on how good the system sounded and I could see her getting distracted by the music as she got in the groove.
Still havent told her about the change, and I havent sat down critically to see if I can describe what I hear, but on first impression, it seems the music has opened up, cleaner between notes, less electronic, smoother in the treble.
Now, admittedly, my prior cables were nothing special, basically a diy set that nonetheless sounded good to me. These "K2" cables do sound better.
I have not taken them apart to see what is inside. the boxes and interior packaging look like audioquest. there is no UPC code on the box. the cables look well made with decent connectors. The 72v box hooks up to the cables and lights up green when you push the button. there is nothing I can see externally that would suggest these are anything other than "k2" cables.
I did have a set of Sky interconnects that showed up today. I havent put them in the system yet. these also look like real thing.
I can say that shipping was free, and arrived in less than a week from Hong Kong. Much better than my Ultimate Cables which have still not arrived after 5 months from Canada. from my own experience, the only time I have been ripped off in all my audio purchases is by Ultimate Cables. I dont consider these K2 or Sky cables to be a rip off, regardless of what their insides may reveal.
Just my experience. Your mileage may vary.