@mulveling Thanks for a very thorough post. I’m sure you’re right re comparative sweet spots. I wasn’t able to A/B Ks and Cs at the same dealer. (Although I remember distinctly disliking the GRFs. Didn’t have that Tannoy midrange “magic” to me.). Met a Tannoy guy at AXPONA a few years ago. He suggested the smaller K driver was the “sweet spot” in the range. Consistent with your observation about K’s sweet midrange.
Interesting comment re STs also
All I know for certain is that my journey from Focal to Harbeth, back to Focal, then Rockport, and now Tannoy has me a confirmed fanboy for the Tannoy house sound