I received my Sound Lab speakers yesterday and got them set up today. I listened for several hours with AtmaSphere MA1s and things sounded quite good. I switched to my Wyred4Sound ST500 amp (250 wpc Class D), and things sound quite good–different, but good. The room is a LOT cooler. Will continue running the Class D whenever not critically listening to break in the speakers. Given the performance of this relatively modest Class D, I’m thinking a top tier Class D would sound pretty darned good on Sound Labs.