In 1931 in Berlin the Haus des Rundfunks was opened with a ceremony in studio 3 after a hectic 8 years of radio history beginning with the first transmission from the FOX Haus near Potsdamer Platz (now: Sony Center)in 1923. In 1929 UFA decided to eventually start with sound films (at first only 50% of the productions) after 5 years of financial pressure and hard decisions when for instance more than 10000 musicians in film theaters had to be fired due to cost reduction. UFA in Babelsberg immediately built the so-called Tonkreuz with 4 huge halls and a center for sound mixing in the middle of the cross. Quality requirements became stronger. Therefore sound approved film studios became necessary. In Babelsberg the existing halls of the Tonkreuz were used to built in a House-in-House or a room-in-room construction with double walls, roof, doors and windows.
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