The Karl Kruger drivers are very rare and considered better than Western Electric. Here are a links to articles for the speakers . From: have to ad http to the links.Quote:This movie theater speakers were built in the 1940s in Berlin by the company “Karl Krüger form. Konski & Krüger”. (This company also used to build the cipher machine “Enigma” for a period of time during the war. It is also known as the executing company for Hans Eckmillers legendary coaxial driver type O15a, which also bears the “Konski & Krüger” sticker on the back and which was used by the German Reichsrundfunkgesellschaft RRG. Eckmiller was also the leading sound engineer for Klangfilm.) If you have any questions or want more pictures, please ask.

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