I dont know about the Rsd, but now i have some revs and this are the bext coax i have try, better than al alpine i have had, my last speakers where PG xenon comp, they sound a little bit cleaner and crisp, but they take 150W rms, instead of the 60 the revs takes.
The xenons dont need 150 watts to sound good, they do good with half that. It just so happends they can handle a lot of power. with that said, the rsds are waaaaaay better than the xenons in everyway possible. not even close
I can vouch for the Revs i have the 6x9 revs just got em for my bday and i love em they sound crisp clear clarity sound and the midbass is excellent right now they are just running off my deh-4800mp hu also and still sound good.
I can vouch for the RSD's, heard them for the first time and was throughly impressed. The mid bass and mid range is excellent, makes me want to get of my Boston's.