Short Version: It appears that the DAC in my new H390 may not correctly implement preventative recommendations on page 2 of the DoP standard, resulting in an audible, and not inconsequential,...
X1 will remain to be our flagship and not to be superceded anytime soon.
One of the D’ag preamps would work wonderfully and perhaps provide the best synergy ... however I really like tubes on the front end of a d’ag amp ... ARC Ref6SE comes to mind along with the Ref10....
Preamp for Dag