The NS1 changed the nature of the Dave for me, and I was using a Pi2AES with a $300 PSU before that, impressions elsewhere.
Source first was always the way it was pushed in the UK in the 80’s, though Linn’s marketing department had a lot to do with that, and to be honest it makes a lot more sense for Vinyl.
The difficulty with digital has always been the Myth that it doesn’t introduce noise.
Transducer first is a more recent phenomenon, based entirely on where the gross errors in a system are, makes some sense, but if you looked at the output from any transducer, none of the upstream noise ought to matter, it’s all swamped, so clearly it’s not about overall quantity of “noise”, but to do with certain qualities of it.
I’m more in the camp, it all matters these days. And yes a good source (streamer etc.) can make a surprising difference.
I’ve given up trying to explain where that noise is coming from, there is a reasonable explanation with the NS1, it’s generating the clock and Jitter matters, but I don’t have an explanation I’m happy with for digital cables and Power cables. I can come up with credible arguments, but none of them really explain the amount of difference I hear to my satisfaction.
I was surprised again over the weekend when I plugged the new power cable in (well I rearranged some power cables plugged the new cable into the amp and replaced a $5 cable with one I already had), my expectation was at best a questionable difference, and it was yet another, wow that sounds different.