Microphone Cartridges

4947 1/2-Inch Pressure-Field Microphone

4947 1/2-Inch Pressure-Field Microphone

Prepolarized Pressure-field 1/2-inch Microphone Type 4947 is optimised for coupler measurements, for example, in connection with telephone and hearing aid testing. It is prepolarized, which enables connection to CCLD input conditioning.


  • Coupler measurements
  • Hearing aid testing
  • Telephone testing
  • Connect to CCLD input
  • High-humidity environments
  • Pressure fields can be found close to hard reflective surfaces, in enclosures or cavities that are small compared to the wavelength, in for example couplers for testing of earphones or calibration of microphones, or in sound level calibrator and in pistonphones.


The microphone is capable of withstanding the IEC 68-2-32 1 meter drop test.


The sensitivity can be calibrated at 250 Hz by using Pistonphone Type 4228 with ½” inch Adaptor DP 0776. The actuator response can be measured using Actuator UA 0033. The pressure-field response can be obtained by adding the relevant correction curve to the actuator response.


Capacitance: 14 pF
Diameter: 1/2
Dynamic range: 17.5 – 160 dB
Frequency range: 8 – 10000 Hz
Inherent noise: 17.5 dB A
Lower limiting frequency -3dB: 5 Hz
Optimised: Pressure Field
Polarization: Prepolarized
Polarization voltages: V
Pressure coefficient: -0.006 dB/kPa
Sensitivity: 12.5 mV/Pa
Temperature coefficient: 0.006 db/ºC
Temperature range: -30 – 125 C
Venting: Rear
Weight: gram
Sound field: Pressure-field
Microphone type: Pressure Field