I have a Denali 6000S V2 in a very revealing system (Mola Mola Makua with Tambaqui, Audionet Max amps, Dynaudio Confidence 20's). When I first bought the Denali, I paired it with a Shunyata Omega V2 20a power cable. My other cables were all Kubala Sosna Elation. After many back and forths, I clearly preferred a K-S Elation 20 a on the Denali as well. The K-S Elation was more full spectrum, even across the range with less etching in the highs. At first the Shunyata was impressive, but after long sessions I found it bright, lean and more 'hifi' sounding.
Recently, I had the opportunity to try a new Sigma X 20 amp PC on the Denali. Again, initial impressions are a wake up for your ears. Dark, black background, extended, very resolving. But again, after longer sessions, I returned to the full natural sound of the Kubala Sosna line. I have since upgraded to the Kubala Realization series in this system, and it is again a big step up. My main system received the Ovation loom, and oh my what an improvement again.