I’ve only heard the Rethms at a few shows with unfamiliar associated equipment but they did sound beautiful in the midrange & very pleasing overall but not truly full range & not near as good up loud. They & I’ll guess the Charney’s, while being quite sensitive, are more akin to Quads in sound than to the Volti Rivals that I’ve owned & enjoyed for two years now.
Rivals are very sensitive also & perhaps the absolute last word in gorgeous seductive midrange & fine etched, “hifi” detail some other even much more pricey speakers but can fill a big room like yours w/ live sounding, dynamic, full bodied & full range sound w/ ease. They are much akin to a high quality version of a big Klipsch, JBL or Altec horn loaded system. I too have a big room (23’x 25’x 12’ ) & the Rivals are a ton of fun & if you like to really nice sound at any sound level but occasionally like to really open it up & wake up your hidden teen spirit ( as well as your wife or neighbors ( forget doing this in a condo)while maintaining excellent sound quality, then definitely check them out.