Gs5556, I think that, in fact, the best sounding concert halls are rectilinear, i.e. the famous "shoe-box" configuration. They are, for the most part, smaller than the halls to which you have referred. Fan type halls are constructed that way as a means to get more people in the hall and not have them too far from the performers and therefore suffer acoustic problems that need to be corrected by all of those devices that you see in those halls.
Bob P.
Bob P.