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

Thanks to all for the responses!  I am using them with a Conrad Johnson MF2250A  120w/ch solid state amp, VTL TL2.5 tube preamp and predominantly BelCanto Dac1.1.   A first for me, recently the circuit breaker tripped in the CJ on Reference Recording  "Tutti"  cd.  It was very loud though, but they are inefficient.  The separation of different frequencies is impressive and I wanted a floorstander this size.  I still own the original Harbeth Compact 7 and the last version of KEF Reference 104.2 (bi-wire).
They sound good on everything.  One can say of course that the F32 is far more neutral but at what cost? 

I might add that I just acquired these without listening first and at a good price.

I did try them briefly with my Manley KT90 Retro 100 amps.  I will try again. I thought less involving, less control than the CJ.

I might add that my Kef 104.2 have Morel tweeters.

So the Revels sound "hard, thin and sterile" with a VTL pre and a CJ amp???  You prefer tubes but these speakers are a tough load for tubes???  Um, what???  Short of you using awful interconnects and cables and/or some awful recordings that could be contributing to the problem, it sure looks like the writing's on the wall on several levels.  Dump the speakers.  Life's too short to spend precious time and effort solving inherent mismatches like these.  FWIW.  Best of luck.