When I first started reading about your problem I thought that you should check that Link Connections are tight or replace the wire with thick basic OFC copper that can be bought for quite cheap price.
However when I read the last posts I can tell you it is the speakers you don't like and there is most likely nothing wrong with the speakers. I have one CD I personally like a lot and once I listened to that CD with a friend and he said that the female vocals on that CD are ear piercing for him and he can't stand it on higher volume. No one else hasn't complained about that particular CD but that one friend and I haven't experienced that at all with any of my CD's.
In my experience KEF's Uni Q driver is really accurate (I own R500 that has the same Uni Q driver as R900) and if you are sensitive to high frequencies you might face some uncomfortable situations with some recordings. Most likely the Logans you used to have smoothed the high frequencies and were more to your liking.
However when I read the last posts I can tell you it is the speakers you don't like and there is most likely nothing wrong with the speakers. I have one CD I personally like a lot and once I listened to that CD with a friend and he said that the female vocals on that CD are ear piercing for him and he can't stand it on higher volume. No one else hasn't complained about that particular CD but that one friend and I haven't experienced that at all with any of my CD's.
In my experience KEF's Uni Q driver is really accurate (I own R500 that has the same Uni Q driver as R900) and if you are sensitive to high frequencies you might face some uncomfortable situations with some recordings. Most likely the Logans you used to have smoothed the high frequencies and were more to your liking.