This is an adapter for old Magnat speakers to replace the original (blown) tweeters (or even the mids if you so prefer)
I designed the adapter in FreeCAD for a Morel MDT-40 to go in there but you can modify the plate to fit your tweeter (or mid) of your choice.
The Magnat Logos are not in the original parts because of possible legal reasons. You can easly add them if you want.
The author marked this model as their own original creation.