Best amp for natural timbre of unamplified acoustic instruments & vocals w/ Revel F32?


Because these are ceramic and titanium they can sound hard, thin and sterile.  But they need solid state probably because they are inefficient and for bass control.  I like tubes but what are your experiences?
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Marked improvement!   Tweeter break-in,  cable changes,  adjusting tweeter and bass settings on rear of speakers have made the Revels much more enjoyable!
Huge Revel fan. Kevin V is a genius designer backed with big bucks for R&D. Don't think he's capable of designing a bad loudspeaker. 

The Revels are not that bad, I heard these F32 with a Pass integrated and the sound was not thin, hard, or sterile.  I also have experience with your preamp, and here in my room, IT was the culprit for this type of overly analytical, hard, glaring sound.  I tried the finest vintage tubes and expensive cabling, no luck.  Finally moved to a Joule Electra preamp and enjoyed it much more.