My system that drives my Revel Salon 2 speakers is this:
Krell 402e
BAT REx Preamp
Esoteric K-01 CD/SACD one box unit
Stealth IC cables
Siltech LS100 speaker cables
the sound is wonderful. I think the Krell works extremely well with
the BAT/Rex tube preamp.
My impression is that the speakers require a high powered amp to give the control you want in the bass as well as the dynamic responsiveness.