Hi Gentcan,
firstly my apologies for the delayed reply. In the time it has taken me to answer I have tried various other combinations with some interesting and somewhat unexpected results, but as I am still trying several combinations I will save that for another time once I have come to a conclusion.
Regarding the Kassandra Ref2 DAC, it is easily one of the very best DAC's I have been lucky enough to experience. When teamed with the Impera Reference 2 Pre this AC combination is simply superb in the sq they deliver together. Hopefully I don't sound to clinical in my explanation, but what I have found with the Kassandra is it delivers a exceptionally layered detailed and dynamic sq with excellent decay and separation, yet at the same time the sq it delivers is both relaxed and, to use that old and usually disliked adjective, musical.
Unfortunately I have now sold my demo Kassandra and I do miss it, though the Helene is doing a very fine job replacing it and both AC DAC's have their strengths, but still the Helene not quite a Kassandra, but at the price point differences between the two AC DAC's one should reasonably expect that.
Combine the Kassandra and Impera along with the Antipodes flagship Oladra plus some very nice interconnects and this combination is to date the most enjoyable digital front end that I have been lucky enough to experience in my main room, there is definately a synergy between these three components at this level that if the opportunity ever arrises I would strongly recommend having a long listen to.
All I would add is an old hifi caveat, once heard you can't unhear.
cheers,
Terry