What baffles is me people buy R7s and other nice speakers regardless of brand and do not invest in room treatments. Room treatments will cut down the ringing and its possible what people were hearing is the reflection and echos due to bare walls instead of the horn itself. Once you got your room treatments in place and if the speakers still sound bright, then you know its not the right speaker for you to begin with.
I have RP line and they are not bright, but they are brighter than dome tweeters I have and I'm on hardwood flooring....adding acoustic panels really brought it together and my klipsch speakers with room treatments sound less bright than my dome tweeters in untreated room but still have that dynamic impact of the horn. Hope I am making sense.
Also the room size has to do with perceived brightness.....of course if you put horns in very small room its going to sound brighter than a very large room which is what its really made for. It is silly I see people buy R7s just to have the best speaker in the lineup but they have wrong room for that speaker.
Get the room right, then get the speaker for that room. It allows you to really enjoy the system much more.
Theater: Sony 45es, 120 inch 16:9 screen, Panny BDT500, Rotel RMB-1075, Rotel RSP-1068, Klipsch RP-280F, RP-450C, RP-160M, SVS PB13 x 2, Monster Power Conditioner, GIK acoustic panels
TV Room: Panasonic 60" plasma, Integra DTR-30.3, Axiom Audio M60, VP150, QS8, EP500