Yes, I have considered trying a KX-R Twenty. Once again, Has anyone heard that combination with the BAR, and was it an improvement over direct?
I always prefer a preamp in my system. I had the Berkeley Ref DAC in my system and it was one of the, if not the, best dacs used direct to my amps. I still love what a preamp does. With a preamp, you might get a slight loss of detail but gain musicality, depth, width and overall added sweetness to less than stellar recordings. I have since moved on from the Berkely Ref DAC and don't miss it.
I have Ayre MX-R Twenty monos and agree that they are outstanding. I am in the process of trying to get the KX-R Twenty to go with them. I am also considering an ARC Ref 10. I have the Ref 6 and it's a little too much for my taste. It's an outstanding preamp and I know why people love it, but it's not for me. I love a slightly slightly softer/sweeter sound.