Well, I've been for a sound test. The NAD D 1050, Arcam irDAC, the Audiolab M-DAC & the Music Fidelity M1 DAC. What a revelation. I had no idea that 4 DACs playing the same music could produce such incredibly different results. Is there a balance between pure reproduction & musicality? I listened to opera, orchestral music, jazz & various types of pop. In the end, I decided that the Audiolab & Music Fidelity probably produced the most analytical reproduction but that I was not sure that I could listen to it on their systems for prolonged periods. I was also fearsome that if I bought either of them I would, before long, decide I had to upgrade the rest of my hi-fi system.
I had expected to buy the NAD, but I felt that it coloured the music to an extent that, to my ears, it almost became boomy. I felt that the Arcam coloured the reproduction too, but to a lesser extent. That's what I ended up with.
A fascinating experience.