I'm looking at this thread as an old Duntech Princess owner who seriously considered Dunlavy's and listened to them a lot. My general observation is that Duntechs sounded better with solid state amplification (it controlled the woofers better, and the older Duntechs had a slightly warmer tonal balance than the Dunlavys--Rowland stuff in particular and some of the Krell Class A amps were a beautiful match with them), and Dunlavys sounded better with tubed amplification (I heard them with VTL, ARC and VAC amplification, among others--the slight warmth of the tubes made them a little more listenable). However, you implied in the start of the thread that you wanted to use the Dunlavys for mastering; for that purpose the Bryston or Mac amps might be a better choice, even though, as Shadorne aptly pointed out, they might sound a little unforgiving. For pleasure, I wouldn't necessarily choose them, but they put out a lot of clean, undistorted power that would certainly suit a mastering studio application.