As an ex owner of AA Capitole mk II, I can tell you that it is considerably better than Opus 21, but somehow behind EMM Labs non-signature separates (I have heard all 3 in my system for prolonged lenght of time).
I have never heard the CDSA though (although some ppl rate it higher than EMM Labs non-signature separates).
I have never heard the CDSA though (although some ppl rate it higher than EMM Labs non-signature separates).