Just wait until you hear these bad boys (6.1's) with all tube electronics. As noted above with tube amps, yes, that is very true of tube electronics in general. However, I once heard these hooked up to Audio Research tube electronics and was floored, literally. I would agree they can provide a crystal clear sound stage which is well beyond what should be available at this price point. With the A/R tube electronics, the 6.1's had a realism, rhythm, pacing, macro and micro dynamic shading, three dimensiona "body" to the music, that was quite shocking. To be honest, I felt like I had $20,000 speakers I was listening to and that is no joke.
I have similar sonic revelations when I hook up my MESA Baron tube amp to them. At times, I have heard them sound so real they hit that venerable "goosebump" territory.
It has been quite some time since I was able to have my MESA hooked up to them, however. Unfortunate, but nonetheless, I know what they are capable of and driven by superb electronics, well beyond the 6.1's usual equipment price range they would be used with, they can provide a pure sonic joy that is extremely surprising.
There is much more they can emote than what one would otherwise believe.