Abstract
The feasibility of conducting reciprocity calibrations up to 100 kc in air, using W.E. 640 AA condenser microphones is pointed out, and the results of such calibrations will be presented. Curves of microphone sensitivity and the output of the unit when used as a sound source will be given for both a normal 640 AA unit and one whose diaphragm has been stretched to give increased high frequency response. In addition, curves for other transducers tested in this laboratory will be presented. All the calibrations were carried out in a small—6′×6′×6′—dead room.
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