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RE: Quasi-ribbon conversion?

I would say no. The foil conductors will limit the maximum excursion of the woofers, there will less Mylar that can tension. The foil will not tension at all. If low bass is important, I would not use foil conductors on the basses.

The mids are suitable for foil conductors. The smallest cross section foil Magnepan can deliver will give the same resistance as the original round conductors. I did this conversion but will have to do it again as the Mylar lifted from the foam tape across the diaphragm. It is important to have the Mylar attached at the foam tape. That way the moving mass is very low. With foil conductors the diaphragm will be a bit stiffer, in theory improve higher frequencies and hopefully better matching the ribbon tweeter.

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