I am using regularly RA 234 speakers in 5.1 configuration (with EAW surrounds and McCauley subwoofer) and I have specified the same system (except this time with JBL 8340A surrounds) for my new studio.
These monitors are extremely detailed and reveal a lot in the midrange. The crossover they specify for the system is asymmetric, LP is 24 dB/oct and HP is 12 dB/oct.
Speakers can reproduce 20 Hz effortlessly, and HF driver, as you said, is one of the best around (also used by Kinoshita). Amps are asymmetric, too, HF section is powered by 50W class A, while LF has 400W, AB.
They're not "nice sounding" monitors, and you have to put a lot of effort into your mix to get it sound right. Errors in recordings are easily audible.
If you go for a McCauley sub, you'll be hearing 16 Hz in your studio without any distortion.