Steve,
Since I got volunteered.
The best way I could describe is that the higher spec ones I have are like a combination of the 6s and the yamamura.
Sweeter, more open and better speed and clarity than the 6s, bigger soundstage in all dimensions, better decay and musical expression but with that little bit of bite in the vocals that the yamamura had.
Hard to comment on weight balance.
I have another set of 6s here that I am running in so will be able to do a direct comparison in a couple of weeks and then give you very specific descriptions of what I hear with a number of selected tracks.
Eg Pete Seager, Beatles, Weavers, Brothers Four, Wynton Marsalis, Planets
When I put the d-getters in the DAC, Brothers Four is sounding very very much like it was when we were playing it at your place, but a mix of yamamura plus 6 flavoring.
Just looking for a little more clarity in my amp which will hopefully be addressed by the same wiring configuration on the input as your 50 amp. Later this week hopefully.
Will keep you informed.