I had the very best from KEF for a few years. I came to recognize a severe distortion and ringing, and sad to say I here it in every concentric topology including these otherwise wonderful speakers. Without fail, every time I listen to this topology it is there. For example, every one is praising the LS50 stand mount. I thought that this could be the one to break free of that distortion/ ringing. But I only had to listen to it for `1 minute to hear it loud and clear.