I wish I could comment on the Ref 3As, but haven’t heard them. I do own the little dynamo Carreras, and it’s a heck of a performer. It’s my first experience with a beryllium tweeter and it’s wonderfully resolving, yet non fatiguing. The Carreras are natural, musical, engaging etc etc. Presents a wide soundstage with good depth. As I have an “acoustically challenged” listening room, I’m quite sure I could get more depth with room treatments and a more suited room. The bass response is quite sufficient/excellent, but I just don’t listen to music with deep bass.
Have you heard either or both?