I can't answer directly (just yet) but I had an XP-10 for almost two years and am temporarily using my Thor TA-1000 tube pre with my Spectrons until my KX-R comes in. I have Spectron Musician III Mk2 mono blocks and can't wait until I hook up the KX-R to them in 10 days to 2 weeks. I liked the XP-10 while I had it, but not enough to keep it. I was going to go to the XP-20 but it only has 1 pair XLR outputs and I do not want to use Y-adapters with the Spectrons. The KX-R offers dual XLR's and it sounded superb paired with MX-R mono blocks and B&W 803 or 804 diamond speakers (don't remember what model and I wasn't a big B&W fan). I think the KX-R will be better than the XP-20 based on my experience with the XP-10. The KX-R seemed to have the best of solid state and tubes without the hassle. I hope this helps a little.
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