Yamaha M2 or CA-2010 Which one would you choose and..

Even if the average is 5W, the dynamic peaks can go much higher, for brief bits. I ordinarily listen around 7W average, but even then brief dramatic dynamic peaks can go as high as 750W. If you don't have the headroom, those peaks are certainly flattened.

I agree. The amp output, in general, depends on the kind of music and the size of listening room. However, the transient peak and dynamic demand a whole lot more. My VU meters seldom go beyond 2W in my 150W Power amp, but sure I will not go back to 50W power amp for my orchestral music even in my 15' X 20' (small) listening room.
 
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