Measure up to 20 kHz!

High resolution audio is quickly becoming an important
market driver in personal audio and traditional testing
equipment is no longer ideal for high frequencies.

This is why we developed the new High Resolution
Ear Simulator.
Reliable measurements
of headphones and
earphones up to 20 kHz
showcase image
  • Improved repeatability above 10 kHz
  • Measurements below and above 10 kHz both in the same
    measurement setup
  • The dampened resonance means better distortion
    measurements, even from as low as 3-5 kHz
The new High Resolution Ear Simulator is designed specifically to meet the need for reliable and repeatable measurements of personal audio devices at high frequencies up to 20 kHz

The standardized IEC 60318-4 ear simulator is a good tool for ear simulation up to 10 kHz. However, its high Q resonance makes it unsuitable for analyzing high resolution audio performance.

The new High Resolution Ear Simulator mitigates this limitation. The resonance is dampened by approximately 14 dB and the damping does not change with varying lengths of the ear canal caused by changes in placement of the Device Under Test (DUT).

Therefore both frequency response and distortion measurements up to 20 kHz can now be made with confidence and full backwards compatibility to historical measurements.

The new High Resolution Ear Simulator is available in two versions:
The GRAS RA0401 Externally Polarized and the GRAS RA0402 Prepolarized.

Explore the key features

  • From 10 to 20 kHz the response is within ± 2.2 dB
  • The 13.5 kHz resonance dampened by approximately 14 dB
  • Upgraded IEC 60318-4 ear simulator - same form factor
  • Full backwards compatible with standard IEC 60318-4 (711) ear simulator

The 13.5 kHz resonance of the High Resolution Ear Simulator is dampened by about 14 dB


Contact us for individually configured solutions matching your need


45CAHeadphoneTest Fixture

43AGEar and CheekSimulator


45BB/BCKEMAR Head& Torso


Available on multiple Test Fixtures

R & D

For R&D testing, a 45BB KEMAR configured with a High Resolution Ear Simulator and an Anthropometric Pinna includes the effects of head, torso, pinna, ear canal and ear simulator in the test. This allows for realistic testing of the effects of variations of insertion depth, acoustic sealing and leakage – effects that end users will also experience.

Production testing

For production testing, the 45CA Headphone/Hearing-protector Test Fixture offers mounting accuracy and repeatability.


For verification, the 43AG Ear and Cheek Simulator offers a fast and reliable test setup to identify divergences between R&D and production samples.

The High Resolution Ear Simulator meets the demand for accurate broadband measurements

Advances in hearing aid design have made it desirable to increase the frequency range of hearing aids. The new High Resolution Ear Simulator offers a method for measuring up to 20 kHz with precision, consistency and good repeatability.

Explore the new possibilities

See model specifications

GRAS RA0401 High Resolution Ear Simulator