Hello!
i had both KX-R and MX-R for a couple of hours on my setup and are indeed great machines. Were the most resolute material that I´d audiotioned past months. The MX-R are in the same league with my Accustic Arts AMP III. The MX-R is more detailed but somehow they seem a litle bit artificial when compared with AMP III. This one has definetly more bottom end and the instruments are not so tight positioned on the stage.
But I was more impressed with K-XR. Is one of the most beautifull pre that i´ve contact so far. It is a big difference to my preamp from accustic arts Pre-amp MK3. In the price too... 4x more! Has more detail, coherence and refinement. If you have the money go audition one on a store close by and see for yourself.
Cheers
Miguel