Abstract
The accuracy of coupler calibration of 12‐in. condenser microphones, such as MR112 and B&K4134, was tested. The coupler used was a new 1‐cm3 coupler [A. Suzuki and S. Yoshikawa, J. Acoust. Soc. Jpn. 28, 475–484 (1972)], as well as the 20‐cm3 a coupler attached with B&K adaptor DB0225. Calibrations were carried out at the frequencies 50–12 500 Hz by the 20‐cm3 a coupler and 50–30 000 Hz by the 1‐cm3 coupler. Pressure response levels calibrated by the reciprocity technique using both couplers showed very good agreement. If the theoretically calculated correction values [H. Miura and E. Matsui, J. Acoust. Soc. Jpn. 30, 639–646 (1974)] are applied to measured values, the differences of the response levels calibrated by both couplers are within 0.05 dB in the frequency range 100–10 000 Hz. It can be said that the method of precise coupler calibration of 12‐in. condenser microphones has been achieved.
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