Valencia To Onken Project Article

[Panomaniac]

Thanks for the pic. Yes, looks very similar indeed. I think the slots are wider than the Onken, but I don't know if that makes much difference. The horn loading would make a difference, of course.
All this dates back to the Jensen Utraflex, the father of both designs.

Here's a fellow in Italy who has Onken/817s
http://www.audiofaidate.org/forum/viewtopic.php?t=2616