Do you still have the edginess if you take the DAC out of the chain and use the Marantz only as the source? If so, the DAC may be the culprit, but if not you should probably look at the speakers, amp or cabling.
Can good speakers take edge off digital?
I have a pair of Quad 12L2 speakers hooked up to an 845 SET. When I am listening to analog, the system sounds fine. But with digital, well, it has that bit of the digital edginess. Can a better pair of speakers, say the Zu Druid, take the edge off the digital?