you're saying this like the wattage is a constant. it's not.... music is dynamic. very dynamic.
if you put a weak amp on them, say a 60 watt amp. set the gains for 60 watts and actually have good control of the volume knob and not clip the hell out of them, they will not get very loud and most likely not sound very full. or take the guy who likes it loud, but cheaped out on the amp. he is going to try to make them loud with the little power he has and clip them and probably smoke them pretty quickly.
if you get an amp on them that has more power than they will need, they will actually end up seeing around the rated power (at times a little bit more, but probably not a lot more) but not get a dirty signal. they will be loud, and have a full rich sound(just like mine do).
now i am willing to bet even with my amp that can do over 200 per side, with the gains set for 150 per side, that the speakers have never seen over 100 watts for more than a split second at a time. do i think the rsd's will take a CONSTANT 150 watts per side and not blow? no i do not. but like i said music is dynamic so sometime they will see 3 watts, sometimes they might see 60 watts, and sometimes on nasty peaks at insane levels they might see 100+ watts.