Marco described my system above. I'm using a solid state Marchand Xover. I haven't done much to it since I installed the Xover and the Bryston. I was warned by several against mixing tubes and SS on a biamp system, but couldn't really affort another VTL450, or better yet a VTL750, or better yet two. So for now, I'm using the Bryston. When I put it in my speakers definitely became more dynamic, with more power and a better Xover than the stock Maggie Xover. And yes, I can hear the difference in the way the bass is treated with the SS. Taughter, like a rubber band in a way - i.e. more damped. I'm not saying it is bad, just different. I have gotten used to the sound and I like it pretty well. I would like to do more experimenting, when I get some time.