Sage Technologies

RA040x High Resolution Ear Simulator

• Improved repeatablility above 10 kHz
• 10 Hz to 20 kHz the response is within ± 2.2 dB
• 13.5 kHz resonance dampened by approximately 14 dB
• Upgraded IEC 60318-4 ear simulator - same form factor
• Backwards compatible with standard IEC 60318-4 (711) ear simulator

- More on GRAS Website -

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.