i have a different point of view... in the h390 and h590 i feel the dacs are quite good, especially the 590, where they integrated the sound quite synergistically with the pre/power sections ... to my ear, certainly as good as the better stand alone dacs up to roughly $1000 (which is a pretty high standard sonically these days)... my experience is based on running roon, using the streaming function, with a well cleansed lan feed (good switch, well filtered, linear power supplies)
in my opinion one has to spend more than $1000 to noticeably better the sonics of the internal dacs in the upper hegels... (think modded mhdt orchid, dena pontus/venus, chord qutest and higher...)