Try listening to Cube Nenuphar V2's with a tube amp (low damping factor) and let your ears decide how this particular whizzer cone driver sounds.
For SS amp, Enleum AMP23R does very well with the Cube driver.
Whizzer cone drivers
According to my expirience as speaker designer , i am wondering why so many companies still making loudspeakers with wizzer cone drivers and so many guys fall in love with this products choosing small paper cone as a additonal tweeter prefering high quality tweeter made from top quality components.Yes, no crossover ( capacitor) , but still ?