The 570's are the model I heard but I have not heard the 530's. I would guess the mids and highs should be about the same, if any difference the 570's I'd think better, The 570's have a full bottom end. I can't remember if they came with port plugs or not. The Krell should control the bass very well but the 570's aren't going to be bass shy to be sure. I didn't get the impression of bass dominance, there was balance but you get a sense of a rich, or full bass. If your neighbors complained about Mozart on the 530's wait until they hear the 570's playing modern music . When I heard the 570's they were driven by an all Onkyo Reference system. The guy had them pretty close into a corner so the bass may be even smoother with more air around them. I'm sure with the Krell driving the 570's you will get a nice physical component to the music.