Tom,
I got to spend almost 3 hours listening to the Ref 1's yesterday. WOW. It's funny how you get used to listening to something, in my case the LS50's, and you don't know what you're missing. Not that the LS50's are doing anything altogether wrong, in fact, as I've stated on my System thread, I find myself preferring the LS50's to my CLS IIz's. But after listening to the Ref1's yesterday I'm firmly convinced that they will be my next speaker.
The sins of the LS50 are sins of omission, a sort of homogenization if you will of the information being presented. It's all there, but very much lumped together like a rock wall. With the Ref 1's it was if a light were grazing the wall, and the texture and shape of each of the stones in the wall were revealed. The more complex the music, the more apparent this was, and the ability to sort out individual instruments in a group, or orchestra was fascinating. I was hearing, not just a differentiation between violins, viola's, cello's etc., but rather each of the individual instruments within each section. In talking to the dealer he explained that with the Reference series each of the individual drivers as well as each component within the crossover were all sorted and matched individually within a very specific set of selection criteria. We do a similar sort of "binning" with regard to the LED's we use in our lighting fixtures, because even the smallest differentiation in color temperature along the black body curve is easy to perceive - so I was able to relate.
If anyone reading this has the opportunity to listen to the Reference series speakers (only select dealers are allowed to carry them), I encourage you to do so. They are something special.