Quote from KEF website:
"Using advanced simulation and analysis tools, our engineers have developed the 12th generation Uni-Q with MAT. This new driver array delivers reduced coloration, less distortion and a sound that is more transparent and life-like than previously possible, all dispersed evenly throughout the room. "
These claims seem justified and sum up the differences (so far) nicely (as advertised).
Less coloration and distortion I do think than before. THe aluminum tweeter is no longer explicitly noticeable by the slight shimmer it seemed to give the sound prior.
Also I wanted to particular note that the dispersion does seem to be much improved. I hear very little difference moving away from the sweet spot compared to prior. That alone makes these both more unique and competitive, adding an additional sense of realism. I may eventually have to try these with sub in my larger family room where my smaller Ohms currently reside. Would not have considered that with the old more directional KEFs.
I’ll post a picture soon but in the meantime note the metas are in same location as prior ls50s about 1/3rd of the way into the room from rear wall and several feet to side walls so bass gets little or no reinforcement with this setup however it benefits soundstage and imaging and the sub picks up the slack. No port plugs in play. Still breaking in but no doubt a noticeable step forward in most every way already perhaps say noticeable bass extension but we’ll see about that still once things settle in more.
