Good aftermarket diaphgrams for JBL

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Is there anyone who have done any actual measurements on the numerous replacement alu/titanium diaphragms around? Radian alu seems to work well, but the others?

Wonder if the catergorical "only original works" is valid. Have found one measurement at Audioheritage but it is only the one I´ve seen. But even mentioning OEM there makes them scream;).

I am interested in the 1" diaphragms for 2420, 2426 etc.
 
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