In reply to:

Let me ask a question like this: would my m60s (rated at 250 watts) peform better with a 200 wpc or 130 wpc? I am not talking about deafening listening levels, just normal.



Nope. Be almost the same.

In reply to:

Also, do you guys think it is necessary to calibrate a 2 channel system with a SPL meter?



If you had a sub yes, 2 front speakers and nothing else, nope.