Perhaps I can respond to your query, Eguth.
Indeed it is a genuine Voigt field coil speaker.
Easy to tell by the centering device that was visible in one of Robinhulmes pics.
The unit has now come home, and I made this photoseries to those interested.
http://www.flickr.com/photos/65583803@N03/sets/72157627525388096/
In fact, it is quite similar to the Voigt units in Johns museum, not counting the outdoor versions of course (which are even more amazing).
Indeed it is a genuine Voigt field coil speaker.
Easy to tell by the centering device that was visible in one of Robinhulmes pics.
The unit has now come home, and I made this photoseries to those interested.
http://www.flickr.com/photos/65583803@N03/sets/72157627525388096/
In fact, it is quite similar to the Voigt units in Johns museum, not counting the outdoor versions of course (which are even more amazing).