i have heard original m-l cls', and i thought they were excellent, for low-key low-level music. i actually considered buying a pair at one point, thinking that, actively crossed over to my upright-style megawoofered vmps subs at ~80hz, it might improve on the cls' dynamics and ultimate loudness. gayle sanders himself told me that, even when crossed as high as 100hz w/a 24db/octave active x-over, the cls's will never go louder than ~93db. so, that ended my desire to own cls'...
ymmv,
doug s.