Krell XD technology

Interesting article at Stereophile regarding Krell's XD technology:


https://www.stereophile.com/content/krell-k-300i-integrated-amplifier-sonus-faber-olympica-iii-louds...


I quoteth it thus:

The key insight, which Goodman told me was discovered in the course of developing the K-300i, is that "lowering the output impedance below traditional norms" results in "substantial sonic improvements."

With 0.035 Ohms of output impedance, this would be a damping factor of around 230. I'm curious for two reasons:

• I have seen evidence that SS amps are more susceptible to impedance variations than we think, and that this accounts for some of the changes we hear in speaker cabling.
•  I wonder if it's something besides better feedback, and they're just afraid of calling it that?
  

I'm not a Krell fanboy, haven't heard them in decades.  Just saying from a tech perspective this was an interesting read for me.