I've heard alot about the expanded efficiencey of Neo speakers as far as doing more with a given wattage than regular speakers. Now, ignoring the weight benefits, whats the scoop? Is a top-shelf Neo 410 gonna give me more of the good stuff than a same brand non-neo given the same wattage? Basically I'm using 575 watt head that I wont get rid of for anything (Ashdown) but need more volume, so logic dictates more speakers, so if I move to a larger neo cab, will I underpower it? what are the drawbacks of neo magnets in terms of tone, reliability etc?