A few additional comments:
1) I am running the KEFs as recommended in the manual with no toe in. Manual says to toe in 0-10 degrees. These are not intended to fire straight at you.
2) They are about 4’ from rear wall, 1/3 of way into room. No port plugs. Would want more bass reinforcement from walls if not for the sub.
3) I would strongly recommend the sub. With the sub these are hard to fault.
4) They bring out the best in each recording. Even the worst ones seem more listenable than before.
5) I agree with the article above. The ls50s could be a tad bright sometimes depending. They have a bit of an appealing shimmer to the sound. These do not. The measurements in the article indicated the only noticeable variation from a flat response is right at the frequency range where ears are most sensitive. That accounts for how easy on the ears these are.
6) Yet the detail is spectacular and with no brightness or fatigue. Soundstage and imaging uncanny. These are very good low volume speakers as well. I am not a fan of box speakers in general but these are the exception. KEF seems to have effectively conquered those issues in a reasonably cost effective manner. Will be interesting to see if/how the technical advances here trickle up the line over time. The competition better be on the ball!