I have the hORNS Universum MK4 hooked up to Jeff Rowland 925 mono blocks, JR Coherence ii preamp, Rega P10, Clear Audio Balance phono stage andEsoteric X03 SACD player. I also use a Definitive Technology Supercube 8000 for extra low frequencies.
I can say these are hands down the best speakers I have owned to date. For such a large speaker, they are so transparent, they disappear in the room. Miles above the KEF Blades I used to run with the same hardware.