Obsidian appears to simply be a newer version of the K2 - so it should be double star-quad, solid core PSS, net 12 AWG. Good for biwiring. I think Audioquest used to consider the K2 roughly the equal of Kilimanjaro (i.e. their 2nd to top cables below Everest some years ago), with the difference that K2 was recommended for single cable biwire applications, and the Kilimanjaro for full-range. A single K2 (or Obsidian) should be functionally equivalent to two runs of KE-4 (or AG-4).Not much out there on these cables- seems they were very expensive and I can pick up a pair for a decent price- anyone have any opinions on them- thks