I received one of the first pairs of Focal Sopra No2's that arrived in the U.S. and have been enjoying them, with no plans to change. They are driven by a McIntosh MC452 power amp; I mention that not to recommend McIntosh to you, but since I've owned the Sopra's, I've heard them driven by amps that made them sound "thin" and where I'd experience fatigue after listening for a while. I think those Kanta's also have that wonderful tweeter, and probably need smooth sounding electronics driving them. I would just recommend you spend enough time auditioning the Kantas with the amp you have in mind, to make sure it wouldn't cause fatigue.