I have owned Legacy since the late '90s. A few years ago I was looking for a change in sound. But during the height of Covid, it was nearly impossible to listen to a few contenders that I had picked out because stores were basically abandoned at the time. Some would take appointments but I didn't want to drag them all the way in and not like what I heard. Anyway, I really wanted to hear the Sopra 3s and Magico A5s which were brand new at that time. After a futile effort of trying to track these two down, I just picked up the phone and called Legacy. I asked them about powering a new pair of Focus SEs with my Ayre VX-5 Twenty and if it would provide enough juice to them (350w/channel @ 4ohms). They said, absolutely, so I I bought a pair that day. And I'm so happy that I did. They saved me quite a sum of money that I had already earmarked for speakers too.
The Focus OGs that I was running had (3) 12" woofers each but produced significantly less deep and overall bass than the SEs. And imaging is no comparison. The new AMTs are simply awesome. So I can imagine just about any quality tube amp would suffice for the mids/highs on a pair of XDs.