OK, now I understand what you're doing. I think I know the history of your tweeter, but don't want to speculate on Danny's circle. I think it would be safe to say that it's closely related to the older GR-Research T1 or T2 tweeter, of which there is still some info out there if you look for it. Good tweeter, smooth, easy to work with for DIY types. Danny will eventually chime it with real information