@dodgealum I have not experienced the Cube Audio Nenuphar or the Sibelius speaker. But I experienced a similar speaker design from France based on the Audax AM21LB driver. You can demo the Audax speakers in Paris and the retail for approx. 2000€/pair (depending on the finish). You can save more by purchasing the DIY kit. This is the speaker I would get if I had a larger room. They sound a bit better when you're standing 3m+ away. Comparitively speaking, most other speakers in the shop sounded more veiled. I tried a few other models from Supravox and Davis Acoustics. I'm not the most experienced listener. And I'm struggling to describe a very transparent and cohesive sound.
I'm guessing that the Cube Audio speaker is very close in design and should sound similar to the Audax AM21. But I'm guessing.
In conclusion, I'm a fullrange driver believer. I get it.