Ear & Mouth Simulators

Type 4987 – Wideband Ear Simulators

Type 4987 – Wideband Ear Simulators

The Type 4987 family has been developed for production line quality control of insert, intra-concha (earbuds), supra-aural (on-ear), supra-concha (in-ear), circum-aural (over-ear) earphone devices, and smartphones.

There are three variants:

  • Type 4987: the core product
  • Type 4987-A: for smartphone testing
  • Type 4987-B: for earphone and earbud testing


  • Compliance testing on production lines
  • Testing during R&D
  • Quality assurance testing

Type 4987 can be fitted with different types of simplified pinna simulators, supporting high-leak or low-leak performance, as well as with standard or customized adapters to make a perfect fit for the device under test (DUT). This allows full measurement compatibility between the production line and the laboratory or verification department. The design of the ear simulator in Type 4987 is based on ITU-T Rec. P.57 Type 2 ear simulator (711 coupler) and consists of a main housing with built-in annular air volumes connected to the main volume by air passages.