Monsterzero, thank you for the comments!
Well. I suppose it would be difficult to find "non X" version.X version loses the magic mids. Not recommended.
Audio-gd NFB 11.28.3W should be plenty for the Sextetts. What amp is it?
I was always frighten about infinite diversity of these headphones. I guess finally I have to find out which version do I need.If you decide to go with the Sextetts, you may want to check out my review on my YouTube channel .Not all Sextetts are created equal.