Can a power amp have too much power, risking damage to a speaker?

@waytoomuchstuff  That is exactly right. Too little power is more likely to do damage than too much, but there are some caveats that most audiophiles are aware off. With high powered systems it is stuff like dropping the tonearm on the record with the volume up. Or switching to a higher gain source with the volume up. 

waytoomuchstuff: old enough to be familiar w the Bose901power issues. 

To mijostyn and others who warn about TOO LOUD sound: We use an audiometer to monitor our listening room and most of our listening is below 70dB; if we are watching an action movie with lots of special effects, we find transient peaks of 100dB or more. A few minutes a day of over 95dB is unlikely to  cause permanent damage.

BTW, the new Apple Watches have an App that monitors SPL and seems to deliver readings pretty close to what I get from our more sophisticated audiometer. 

Doing some quick math here, your Mac and K'horns or LaScalas should hit peaks of over 130 decibels in your room. Should be plenty of dynamic range available on demand.

agree... with your math😁. And will not even approach 130db in our theater. 

About 30 years ago a dealer (who shall remain nameless) in Philadelphia told me that basically, "Too much clean power has never hurt a speaker."  He told me a lot of other things that I suspect would get pushed back on here.