As I have said before, I am running my X5s with less than 2 watts using 45 tubes and I play it LOUD sometimes. I am much less concerned about dynamic swings than I am about hearing vocals that cause me to melt in place. We all are looking for something different, so unfortunately the only way to know if you will like a particular amp with your speakers is to try it out. I have gone through probably 10 amps in the last couple of years using different Spatial Audio speakers and for me, my 45s hit the sweet spot. YMMV