All I can say is that I love my Turnberrys and would only sell them to go the Kensington or above in the Prestige line, but I certainly don't feel any urgent need to do so. I think your XA60.5 would do fine with the Kensingtons, though. Although I didn't use it with these speakers I have owned the XA30.5 and did use the similarly powered Luxman M600A with them. Plenty of power. My room is 17x15 with a cathedral ceiling.
