NOS vs. upsampling I have been able to do direct comparisons on the "Fly" with a touch of a button in the past.. NOS has a bit more body, more intimate and even meat in the middle midrange in your face, but pretty smooth, and with many transports can add weight to the lows yes..
As for Air, soundstage, its good and more like sitting in the recording studio..
Using upsampling definitely adds a little bit more of synthetic air, and causes a slight enhancement in surround sound type approach.. But can be sharper sounding in the end as the highs seem to carry more air exactly because they are a little more enhanced thru upsampling it seems.. Bass, well it depends its still deep, but more separated, so it might be as punchy but more spread out.
By the way fact is some recordings if they are just bad, or really need something can benefit from one type or the other of Dac, upsampling can help if its just a really compressed sounding recording, but to me is not as natural sounding, so yes Vinyl type sound is a little easier to mimick via NOS if you ask me.
