What is the best amp for Sonus Faber Cremonas?

I currently am driving the Cremonas with a Mac MC402. I find the Mac amp to be too dark with too much bass. (The speakers are well positioned out into the room.) I recently auditioned an Accuphase A-30 class A amp compared to a pair of Mac MC501's with Wilson Sophias and thought the Accuphase was far more musical and detailed. I never would have thought a 30 watt amp into 8 ohm (60 watts into 4 ohms) would be so effective. I am concerned about using this amp in my room which is 25' x 20'. My speakers have an impedence of 4 ohm with a sensitivity of 90db. I am using a the Mac C2200 tube preamp, but I would be willing to switch it out as well.