I decided to take some days to get used again to the kind of music presentation of these old Sennheiser. Other headphones companies (Akg, Hifiman, etc) reproduce music in different ways and Is always difficult for the brain accomodate with new style, I need time.
Coming from Akg at the begin Sennheiser sound seams confused and to much mixed because Akg tend to focus to each instrument, Sennheiser Is more for the ensemble and then brain Is able to go into and find each.
Sorry for long replay, I'll make a comparison between them with my humble english in few days.
Thinking to It jumping quicky between cans of different company make differences clear and seams useful but not always the result is the same after more time with each of them. But Is not the right topic, Sorry again.