Pass Labs XP-30 vs Krell Evo 202

Hi,
I am considering upgrading my preamp and would appreciate your help in comparing the Pass Labs XP-30 and the Krell Evo 202. I am also interested in finding out how much of an upgrade each of these will be over my current Classe CP-50.


My current setup is,
Thiel 7.2 Speakers
Krell FPB 400cx Amp
Classe CP-50 Preamp
Esoteric X-03 SACD Player

Note: I have already tried a Conrad Johnson 16 LSII. I preferred the sound of my Classe to this unit in my system. The Conrad Johnson reduced the amount of detail at all frequencies compared to the Classe. The Conrad Johnson also produced images that are big and somewhat smeared together where as the Classe has space between the images. The Classe soundstage also had more depth and width.