Can my MC275 power speakers with 91db sensitivity

I believe the original Cremona were rated at 90dB and the Cremona M at 91dB. The article that Al linked to was for the original Cremona. I believe the M are in fact easier to drive than the original Cremona. I have the original Cremona and concur that they are picky about amplifiers. I tried many amps and ended up with a Levinson 432, which does 400 watts are 8 ohm and 800 watts at 4 ohmns.

I would be cautious of your amp with the original Cremona, but it might be OK for the Cremona M. Unfortunately, I do not believe that Atkinson ever measured the M.

I agree with the whole discussion of the difficulty of driving the original Cremona speakers and the problems of difficult phase angles. But, before reaching a lot more conclusions, I think it is important to understand if the speakers are original Cremona or Cremona M. They are quite different speakers.

So it is Cremona M that you are considering. Much easier to drive than the original Cremona, which is what Al originally discussed.

Here is a thread with a guy who successfully used MC275 with Cremona M.

Cremona M with MC275