I auditioned a pair of Jubilees yesterday and they sounded awesome on Crown SS amps. Now could they have sounded better? Maybe, I don't have that much experience with that level of speakers. They were incredible.
When he first got the speakers, he was using a solid state Adcom. I walked away with a less than good first impression. Once he got some tubes behind them, it's like they became a totally different animal. YMMV.
It's possible the problem was not SS in general but that particular amp. And also that it's those particular Macs that are good with the speakers and not tubes in general.
Anyway I've been using horn speakers for over 35 years----Altec, Klipsch, EV, JBL, Edgar, PAudio, McCauley, you name it, both turnkey and DIY systems. And I've heard them sound good AND bad with both SS and tubes. Last Cornwalls I had I powered with both SS or tubes at various times.