I have the kef r500, i have'nt tryed the amp in question to power them though, i use a denon av amp and the denon 2012ud as a cd player. I used to have the b&w cm5 speakers before i bought the kef r500 a month ago. The b&W's are no where near as good as the r500. The r500 have to be listened to, to get a real understanding of how musical they really are, they deliver big time, reeling off every music track you play them, layer after layer with a combination of emotion,tension,exitement,etc, with a truely fantastic soundstage combined with clarity, treble definition and bass definition as well. These speakers stop for nothing, unraverling really complicated music tracks. I would recommend these to anyone who loves good perfomance .