Sound sources produce both air-borne and structure-borne sound, which are transmitted via building constructions. Acoustical measures are such that the sound pressure level of structure-borne sound is reduced by introducing floating constructions on springs. For different applications, permitted levels of structure-borne sound are known and have been published. They are, for instance, related to the proper function of sensitive machinery, computer or sensitive instruments. In the same way, permitted noise values of sound, which are irradiated from the studio surfaces, must be considered. Some acoustical measures for floating floors, heavy construction with low-resonant frequencies, and sound insulating boxes are explained. Level differences as a result of different acoustical measures are involved.:
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