They (ID1) sound good :). Slightly bright top end, good strong bass. Midrange not as 'luscious' as a yamaha, but clear.
Regarding driver rattle, I think defectiveaudiocomponent and sachu experienced this and came up with some solutions in the past. I can't remember what they were, but could be worth PM'ing them.
I used the stock damping, it's pretty good tbh. I think at times I only used 1 damping pad rather than 2. The main thing is they really need a lot of power to sing. I used to drive them directly out of my vintage Cyrus 1 speaker amp. One of my backburner projects (sitting there for years....) is to make this driver more efficient.
MuZo2: no the drivers are not like NAD and Foxtex. Although they were made by Rank, which was the same driver developer. The ID1 drivers are a corrugated rectangle, suspended on 2 ends only, with a very weak magnet structure (a bit like fridge magnet sheet with holes punched in it..)
Edited by Kabeer - Today at 1:20 am