thewas
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By the way, especially in the past and from smaller companies, not every driver that was sold as Beryllium was really and fully one:
https://www.behringer-electric.de/app/download/9021869186/the_truth_about_beryllium_diaphragms.pdf
https://www.behringer-electric.de/app/download/9021869186/the_truth_about_beryllium_diaphragms.pdf