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 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.