Ear & Mouth Simulators

Type 4227 and 4227-A – Mouth Simulator

Type 4227 and 4227-A – Mouth Simulator

Mouth Simulator Type 4227 is designed to test telephone transmitters, smart speakers and other microphones where a sound field similar to the human voice field is required. Also used as accurate reference source for near field testing of handsets and microphones.


  • Quality control testing of frequency response and distortion of telephone transmitters and close-talking microphones
  • Sound source for acoustic measurements
  • Smart speaker testing

Provision exists for fitting a microphone at the mouth opening, for use in a compressor loop to give constant sound pressure output. Accurate calibration is facilitated by a calibration jig provided with this product.