well I've tried the 49720, then I've put back the 4562....and indeed the sound seemed less refined. so I've put back the 49720 again(I'm getting really handy at switching these now
) and it's definitely a winner
I don't really trust my brain for non A/B comparisons, but the 49720 sounds really fantastic! ok thanks for the tip, I've ordered some OPA211 samples...I will have a friend of mine soldering them on DIP8 adapters.
I also plan to order TO99 metal 49720 and fit them (somehow) in the DIP8 adapters, everyone(even some National engineers) agrees that they sound better(better EMI shielding?)