Hi, James--
The speakers are electrostatic hybrids,
Janszen Valentinas. (The model name was changed from zA2.1.) Besides being very low in distortion, they are rather beamy vertically, which works well with the 7-foot (213 cm) ceiling in my basement listening room. Their small dimensions also help make the low ceiling less apparent. But I bought them primarily for the sound, not the looks!
When I bought them (July, 2014) Janszen would not warrant their speakers when used with power amps rated above, I think, 300 W into 8 ohms. I believe they feared that accidents could blow the electrostatic element. I don't know if that policy is still in place.
I used the 14B ST briefly with them, and the combination was outstanding. Looking forward to installing the 4B3.
Mike