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WB could have go further ahead and do field coil that is rare even today.
I believe they were a one off by Dave Slagle of Intact Audio.I have no guess where they are today.
Cheapest alnico fullrangers out there. https://m.facebook.com/story.php?story_fbid=939542246250888&id=756452797893168
Yay. They need to update their main website with this sort of info instead of FB.
Response chart will look similar to the original Betsy I’m guessing. The new speaker is mostly the same driver but with an alnico magnet.
This not good, a Alnico magnet require other project diferent from Ferrite, the way to design the mobile parts of a Ferrite and Alnico speakers are very different not mentioning the critical VC, according the old school from 1940/50.