I have the KEF LS50's with the Rega Brio-R and Apollo-R. This combination also is very very nice - yet I know the KEF's would work even better with a much more expensive amp! - but everything is a matter of balance - and budget. If it sounds nice, with no undesirable noises, the KEF's are probably happy. I do find LS50's are very responsive to different cabling - which makes sense, as they are so transparent and let you know about any weak parts of the system. Oh, and I also leave the amp on 24/7. In the case of the Brio-R, they use only about 10watt per hour, which is insignificant in my home power total. And if that seems a waste, we make 2X what we use through roof-top solar panels.