Hello cynamon,
the system sounds very good. I am currently playing with the room correction since I have a difficult room. The bass of the system is unbelievable, the mid are good, slight harshness of the treble seems to be going away as the system burns in. The Ref9s are amazing for the money and their size. One thing I would like to try is to try a valve preamp to see what difference will make. Something else I will try in the future is moding the Ref9s (better caps and decoupling schemes). I had great doubts about SMPS but all my fears evaporated once I listen to the Ref9s. Of course there is always room for impovement to get the last 5%.