Michael,
Congratulations on scoring those PranaFidelity Fifty90s! I know how great they sound because I was lucky enough to hear them in their creator's listening room last summer. Steven Norber is a genius if you ask me. The SQ he squeezes out of the driver's and crossovers made a huge impression on me. Of course, he powered them with his Ncore1200 amp 400w/ch amp, which may have influenced the SQ just a wee bit.

I also got to hear his floor standing speakers that are voiced the same to my ears, but reach deeper in the bass region. I periodically check for used Fifty90s in the hope that I'll score a pair (even though I have no place to put them at the moment).
I once had a Denon. When I moved up to a better quality amp, the difference was striking. I suspect you'll have a similar experience with your new Emotiva amp.
Enjoy!