The moving-coil electromagnetic microphone is a medium-priced instrument of high sensitivity. It is principally used in broadcast work and in applications where long cables are required or where rapid fluctuations or extremes in temperature and humidity are expected.
The best designed moving-coil microphones have open-circuit voltage responses to sounds of random incidence that are within 5
dB of the average response over the frequency range between 40 and 16,000
Hz. Sound pressures as low as 16
dB SPL and as high as 140
dB SPL re 20
μPa can be measured. Changes of response with temperature, pressure, and humidity are believed to be, in the better ...