It seems the KInki may be better suited to a speaker with higher efficiency and more like an 8 ohm load.
The reviews I’ve read, all very positive btw never mentioned it having a problem driving certain speakers. In retrospect, perhaps I should have paid more attention to the speakers they were using in their review.
That said, I wouldn’t mind owning a pair of speakers that are easy to drive with almost any amplifier. It would give me more options.