Dyns, power hungry????? I had the System 240 MKII and power hungry they aren't. If you use the supplied xover the tweet protection kicks in and you have to wait a minute or two at low volumes for it to reset. It's just a resistor that when it gets to hot it cuts back the power to the tweet as to not fry it.
If you go actively with them would be the best bet. For example: say you give the mid 100 wrms and its a 91dB s/n speaker then that means at the 100 wrms it would be at @ 111 dB, if you give it 200 wrms, which I don't recommend over 150 wrms, then you'd only see another 3 dB in gain for 114 dB which to me isn't worth it.
But as I've been posting a lot lately, power is much like sound..... It's all subjective.
Have you ever noticed how little power SQ comp cars actually have? 300-500 wrms on avg.