@charles1dad - by the way I love your user name!
So who’s doing this ? People have rightly posted that speaker impedance and phase angle characteristics are factors that require awareness and consideration. This is true as they greatly influence how successfully a tube amplifier will pair with them.
If you rad through the responses, you can see what I am saying. I do not want to call anyone out so I left my comment as such.
As far as impedance and phase angle, maybe matching a95-99db speaker has benefits but overall unless you are using 100-200wpc tube amp on one of these speakers, a good designed tube amp will do what it takes. But I am taking class A designed tube amps. We have a few AB designed tube amps from well know manufacturers in our Listening Room and that is what most people have experience with. Out 40wpc mono blocks drove the YG Acoustic Carmel speakers with ease and outperformed the $16K Class D amps no contest.
Happy Listening.