FWIW, I am finding that higher efficiency, easier to drive speakers are a lot of fun. One is not obsessed with high power amps required to run inefficient speakers, so you can concentrate on the overall sound.
For example, I had read about First Watt products and decided to try one. I picked the F7 because I was persuaded that the damping factor of the amp would do a good job driving the Forte iv woofer.
It did that but also veiled the presence of the horns in the Fortes. The law of unintended consequences.
But the real learning for me is that I am starting to truly listen to what I am hearing.
Anyway, the F7 is currently a good match with the Carbons. Interestingly, I can tell when the F7 gets warmed up after being shut off overnight. The sound changes for the better quite dramatically to my ears. I have heard that sort of things with tubes but not so much with solid state.