Hmmm...perhaps someone with more knowledge of these specs and shed some light...

Looking at the description of the 3910 vs the 2910 on the Denon website I noticed a different DAC is used by these players...

The 3910 uses this.
The 2910 uses this.

Like I said, someone with greater knowledge of what all those specs mean would have to explain it to me. To my eyes, a $3 part was replaced with a $6 part, and the price went up $600. There's got to be more to it than that, no?