This might not answer your question, but I had a similar experience with a 2900 and MF tri-vista DAC. That combo was only slightly more detailed then the stand alone 2900. I ended up going with a dedicated CDP for redbook, the MF-A5 which is much better all around. I use the 2900 for DVD-A and SACD but much prefer using the dedicated CDP. I don't even remember the last time I listened to music through the 2900. When I find single layer SACDs in my rack, I put them right back on the shelf.
Check out the many threads on denon mods here and talk to Exemplar, APL, and Underwood about what they would recommend. Best of luck.
Check out the many threads on denon mods here and talk to Exemplar, APL, and Underwood about what they would recommend. Best of luck.