Have you guys heard of Neils' new PONO yet?
https://www.yahoo.com/tech/neil-youngs-pono-music-system-almost-ready-to-rock-in-100182858224.html
HD source but daggone, the DATA space it uses. WOW!
If I had an auditioning studio, PONO would be welcomed.
turtsmagurts, have you tried a CD player source yet or CD in a DVD player?
Barrow one and see if it doesn't fill in the blanks, then go from there.
That may help to begin the process of elimination of what's causing the lack of quality.
Directional cables or high quality interconnects could make a difference on the CD player as well...