I used to run Vandersteen 2ces and Dynaudio 72's at once and enjoyed listening to that a lot. They complemented each other well.
Using two sets of speakers at once?
I have a set of Meret Ays and I love the highs, but they are short on bass. I have a set of Paradigm Studio 100's v3 and I like the bass response, so I generally listen to all speakers at once. How come I don't hear of more people doing that?