I do not know how I missed this thread
I do not seem to receive post notifications on occasion.
15 years ago, it was a more difficult to find a driver that suited my purpose, thus a custom built driver was necessary. A few years later, something similar would have been on the shelf available from TC Sounds, etc... Today, I'm too far departed from that realm to advise you. After almost an hour of searching, I still could not find the specs. If I come across them in the near future, I'll post them here.