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BW MatrixMkII FotoWeiche. Lizenz Public Domain Quelle Gnther Nubert Nubert Speaker Factory freigegeben zur Verffentlichung Aufnahmedatum unbekannt de Frank Klemm de de German Frank Klemm original upload log page de BWMatrixMkIIFotoWeiche Frank Klemm bytes no vom Autor Gnther Nubert Crossover networks loudspeakers Loudspeakers