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RE: You mean like Eminent Technology does it to from start

As I understand it, etching or deposition is necessary for small drivers because the heat would damage the adhesive, but not necessary or cost efficient for large ones:

"Note that larger planar magnetic drivers are never subjected to such a high power/area ratio, and their larger surface area also creates higher sound pressure levels with ease. Thus the added cost of the adhesiveless approach is neither necessary nor warranted in larger drivers."

http://www.wisdomaudio.com/pdfs/Products_WhitePapers.pdf

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