Got the MRX 720 up and running. Out of the box, it sounded far better than the Denon (and that's with external amplification in both cases). Cleaner, and more detailed, with better imaging. The gap widened even further after running ARC Genesis.

Axiom M5HP VP160 M3 ADA1000
Anthem MRX 720
SVS SB-3000 (dual)