In short, it is used to record stereo information in the OSS technique (OSS=Optimum Stereo Signal).
Shortly after the release of your "open" Float, other manufacturers came out with open headphones. Who stole what from whom?
Nobody stole anything. The idea was in the air, and I just happened to realize it a little earlier than others.
Excerpt from the interview with Jürg Jecklin on the occasion of the Klangschloss 2012
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