In connection with jazz music projects, we were looking for a microphone that could best pick up the double bass. The C700A with serial number 110, produced by the American company Josephson Engineering, turned out to be this. The first tests showed that we have not achieved such recording detail before. The sound image of the double bass is juicy and deep. The dryness and so-called looseness caused by conventional microphones has disappeared. In the near future you will be able to hear our first jazz recording using Josephson C700A.