EDIT: also listening to my HE-500 with the Norse cable now, i'm very impressed, for the first time i heard a decent change in sound vs. the stock silver cable. overall, the sound is very smooth, with no edginess, and there seems to be alot of depth and transparency in the midrange. the treble is even better than before, vocals seem even better presented and the sound is more refined now. with the stock i felt like something was holding the headphones back a bit, like some small veil somewhere in the sound.
also with the stock, i felt like the bass was slightly further back from the mids/highs, now the bass seems more coherent and more in line with the rest of the sound. impact/quantity is about the same, it just doesn't feel as far back as before, which made the sound rather washed out originally. overall, the cable added slight but noticeable improvements without affecting the overall sound.
Interesting observation Dubstep Girl. Which kind of Skuld cable did you get?