Hologram is more neutral, still a little warm in a very nice way, but more neutral and extended than the Cardas which does have a very nice midrange tone but otherwise overrated with big bass and rolled off highs IMO.
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I had an excellent experience with Hologram mk I with my Sonus Faber Concerto Grand Pianos, which, like the Thiels, are a bit tilted up on the very high frequencies. I knew I previously had inferior speaker wires (old Straightwire Rhapsody), but I was still surprised at the AMOUNT of difference these made in bass extension and overall openness. I don't have any experience with the Cardas cables though.
Acoustic Zen speaker cables have a nice nuetral sound. I would recommend tuning your system with interconnects, easier and less expensive. I have used cardas golden cross ic's, they would be good to tame a hot system. I have seen the golden cross ic's used on thiels in the dealer showroom also. Just one pair in the chain will do the trick.