-74
dBV +/- 4 dBV (126 to 316 V RMS) open-circuit with an input signal of
-6 dB Pa applied to the front surface of the microphone housing that is
held on-axis at one inch from the lip ring of an artificial mouth per
IEEE Std 269-1992 and ITU-T P.51
-11.8
dB Pa +/- 5.0 dB Pa into an IEC 60318 and ITU-T P.57 Type 1 coupler
equipped with a Bruel & Kjaer Type DB 0843 adapter with an
input amplitude of -10.0 dBV through 300 ohms