Watts Dissipated in xsim says what? and what impedance should my amp be at?

After doing a crossover build, making sure all the components don't exceed max power, got them shipped and speakers sound great! I wanted to see if I can turn the amp to max volume and what the speaker wattage would be. drivers are 7x 6.5inch 100w rms woofers and a single 80w rms compression horn. looking at the watts it says I'm getting over 1000 watts on the horn 700w amp? the speaker is 4.5 ohms. using a QSC gx5 amp (700w at 4ohms). thanks for any help in advance!
 

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It's not likely you'll apply that much power to begin with.

On top of that you want to take the plot in context. It assumes you are applying full power at each frequency separately, which makes sense from a plotting point of view, but isn't realistic. Not only is the music spread across the spectrum, it also falls toward the top.
 
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