So, question: what got better downstream? And what defines better?
I shouldn’t have written better - I should have written different and preferred sounding. I was previously running everything through my Pioneer Elite VSX 52 receiver. Eventually picked up a Parasound 275V2 to run out of the preamps which seemed to make some difference though not huge (I’m not claiming any scientific basis to this and never tested it 4 years ago) but the biggest difference was going to passive preamp which I did blind test. This was very easy to test using an RCA switch after level matching, and it was very clear the receiver was coloring the sound in an undesirable way to my ears.
I do not know how much the amplifier changed, but getting the receiver out of the playback chain was the difference maker to me.
What was also pretty clear is that digital playback suddenly became fatiguing to me when it previously wasn’t. This isn’t even something I was looking for since I expected it to also sound better to my ears with the entire down strain chain improved. I had no plans to get a new DAC until I started researching and researching.
I am willing to accept that digital just might not be for me in this system, and that I do prefer distortion and coloration. Maybe what I need is a DAC with a ton of filters I can play with, or maybe I need one that measures very poorly like vinyl which I can listen to all day.