Thanks for the description. I don't think Jitter is the cause of pops and cracks, maybe that's much worse.They actually test every single device on an analyzer.
I have bought 2x A30's and a D30 and a DX7.
All had measurement papers in the box, but then again I've had the A30/D30 for a year already before it was popular.
I could probably ABX the D30 and the DX7 given the right tracks and headphones.
I did spend many times AB testing the two of them and there are a few songs that have specifically more details with the DX7 vs the D30. The difference is not huge and you have to listen critically.
The one thing though is that the D30 has more jitter via USB and this is present while the DX7 never has a pop or crack no matter how long you listen.
Also the D30 is slightly warmer sounding vs the DX7. I did this testing by feeding my DX7 or my D30 through the same A30. Later on when I got my O2 amp I did some additional testing feeding my O2 with either the DX7 or D30. The tests weren't blind but as I said there are differences which are easier to identify especially listening back to back given the right tracks.
Additionally the D30 had some things where sometimes male vocals were slightly recessed in things like TV shows.... its very weird and I did extensive testing with this to find that it doesn't always happen.
I've never been a fan of the Sabre dac, but it seems the new chips are much better than the old ones, especially for dsd.