Originally Posted by snarks
Friend of mine suggested the 4311ci. I am pretty sure the 891 does 130w into two channels . Will there really be that big of a difference between that and the 170w the 4311 does ?
In practice, it wouldn't matter, since the difference between 130WPC and 170WPC is negligible (just a tad over 1 dB perceived volume difference, which is basically inaudible).
I know that the CM7s have a 5dB or so dip (right in the mids, if I remember), which is kind of large and it may be audible. Not sure the CM9s have a similar dip, but even if they did, power by itself wouldn't do much for it -- room correction may be able to compensate for it.
Either way, these are rather sensitive speakers (I doubt the momentary impedance dips would matter much in daily use) and in an average room you are unlikely to play it so loud as to experience any issues:
With speakers of 89dB sensitivity you need 100WPC to achieve just over 102dB SPL at 10 feet.
Even an hour of this sound level a day will cause irreversible hearing damage rather soon, which I suppose would mean that you'll then be looking either for a much more powerful amplification, or for a hearing aid.