If they like current and high dampening consider Hegel 360 or the higher end Hegel separates. They step up to great speakers generally although I have no first hand knowledge of how they play with radho. You have some great options out there keep us posted.
Raidho speaker owners, what solid state amplifier do you use?
There seems to be consensus SS amps in general are better match for Raidho speakers than tube amps. I'm using 200 watt Bob Carver tube monoblock amps with my D2 to great effect, but I'm interested in getting a SS amp (less than 8k new or used). The Soluution, Constellation, etc are way too overpriced IMO. Any experiences with less costly offerings? I am looking into the new Yamaha top of the line integrated, AS3000, which is 7k retail. It's rated 100 watt at 8 ohm and 150 at 4 ohms and is built like a tank with substantial power supply (over 50 lbs). This is the way Yamaha used to build their top amps decades ago before they went cheap mass market.