I ran Paradigm Studio 100s v3 with a Rouge Tempest for a while and in my opinion, they worked well together. I assume the 40's are similar, but the 100's have a pretty rough impedance curve (that is, some bigger dips) that makes them less friendly to tube amps.
So long as you aim for 40 or more tube watts (or so), I think you'll be fine. Good luck.
So long as you aim for 40 or more tube watts (or so), I think you'll be fine. Good luck.