Axiom Home Page Forums General Discussion Advice from Axiom Owners Help a newbie with deciding m60s m80s

"about right" is amp power about the same as the speaker rating.

to be more specific, you could read this:
http://forum.qscaudio.com/forum/viewtopi...a52daaddd1a0da3

if you don't want any headroom above, let's say, 105 dBSPL, you just have to calculate the power you need according to whatever SPL you want.
but it's always a good thing to have some spare horsepower.

you can find a calculator here:
http://www.crownaudio.com/apps_htm/designtools/elect-pwr-req.htm
i think the calculator is calibrated for large halls and mainly outdoor events, so the results will not apply exactly to indoor needs.
Less power is required indoors than outdoors.