Although I have never heard the A3, I can concur that the Z5s sound utterly sublime with classical of all types/genres on the 1Z - with a balanced connection (never tried single ended with the Z5's). Obviously, if the recording is C**P, you will hear C**P, but modern decent labels frequently sound wonderful; a very refined sound that really is quite surprising. The bass is never over-powering and gives a lovely bite to the lower frequencies, particularly strings. There is a tendency for some labels to just re-package old recordings - and the result is often underwhelming. However, with modern mic'ing and mastering techniques, modern recordings sound as they should. I was never a "recording snob" until I started listening with this combination but now I absolutely am, and I will hold off buying the recording of a particular piece until I can find it on a label I trust to deliver the goods.