Artificial ears, ear & mouth simulators

The GRAS RA0045 is an ear simulator with an acoustic input impedance closely resembling that of an average human ear. It includes a 40AG pressure microphone and is individually calibrated with this specific microphone.

The GRAS RA0045-S4 Ear Simulator is an ear simulator with an acoustic input impedance closely resembling that of an average human ear. The RA0045-S4 includes a 40AP pressure microphone and each RA0045-S4 is individually calibrated with this specific microphone.

The GRAS RA0045-S5 Ear Simulator is an ear simulator with an acoustic input impedance closely resembling that of an average human ear. The RA0045 includes a 40BP pressure microphone and each RA0045-S5 is individually calibrated with this specific microphone.

GRAS 44AA Mouth Simulator is a sound source that simulates the sound field around the human mouth at close quarters and complies with the Standards IEEE 269, 661 and ITU-T Rec. P51.GRAS 44AA is for testing telephone mouthpieces as well as other microphones similarly used in communication networks.

GRAS 44AB Mouth Simulator is a sound source that simulates the sound field around the human mouth at close quarters and complies with the Standards IEEE 269, 661 and ITU-T Rec. P51.GRAS 44AB is for testing telephone mouthpieces as well as other microphones similarly used in communication networks.

GRAS RA0045-S1 is an ear simulator with an acoustic input impedance closely resembling that of an average human ear. The RA0045 includes a 40AO 1/2" prepolarized pressure microphon and each RA0045 is individually calibrated with this specific microphone.

The GRAS RA0045-S6 Prepol Ear Sim IEC 60318-4, High Sensitivity is an ear simulator with an acoustic input impedance closely resembling that of an average human ear. The RA0045 includes a 40AD pressure microphone and each RA0045-S6 is individually calibrated with this specific microphone.

The GRAS RA0038 Coupler is a standard 2 cm³ Coupler according to IEC 126 and ANSI S3.7-1973. It uses a ½" microphone (preferably the GRAS 40AG) with a suitable preamplifier (e.g. GRAS 26AC which is a ¼" preamplifier but is supplied with an adapter for ½" microphones).

The GRAS IEC 318 RA0039 Ear Simulator is an ear simulator with an input impedance closely resembling that of an average human ear. When the RA0039 is coupled to a sound source, the impedance will load the sound source similar to the loading caused by the human ear. The RA0039 meets the requirements of IEC 60318-1:1998 Electroacoustics - "Simulators of human head and ear - Part 1: Ear simulator for the calibration of supra-aural earphones".

The GRAS RA0056 Low-leak Pinna Simulator is an outer ear simulator intended to be used with the Ear Simulator RA0045 to simulate a complete ear for testing telephones and loudspeakers

The High-leak Pinna Simulator Type RA0057 is an outer ear simulator intended to be used with the Ear Simulator RA0045 to simulate a complete ear for testing telephones and loudspeakers.

The GRAS RA0075 is a 6cc coupler for testing earphones according to ANSI 3.7 - 1995 and IEC 60318-3.

The GRAS RA0076 is a thread adapter to use when mounting a 1" or a 1/2" microphone in the RA0075 NBS 9-A Coupler. In the case of a 1/2" microphone the RA0077 1/2" - 1" Adapter for Coupler is also needed.

The GRAS RA0113 is a 2cc IEC 60126 coupler which uses a 1" microphone, e.g. the GRAS 40EN.The microphone, without its protection grid, screws into the base of the RA0113.

GRAS RA0252  is a1/4” 0.4cc High freq Coupler for testing of hearing aids at frequencies up to 16 kHz.

The GRAS RA0401 is a high-frequency ear simulator with an acoustic input impedance closely resembling that of an average human ear.  It includes a 40AG 1/2" pressure microphone and is individually calibrated with this specific microphone. It features a special dampening system that extends its useful frequency range to 20 kHz. Its prepolarized equivalent is RA0402.

The GRAS RA0402 is a high-frequency ear simulator with an acoustic input impedance closely resembling that of an average human ear.  It includes a 40AO 1/2" pressure microphone and is individually calibrated with this specific microphone. It features a special dampening system that extends its useful frequency range to 20 kHz. Its externally equivalent is GRAS RA0401.

The GRAS RA0403 is a hi-res ear simulator with an acoustic input impedance closely resembling that of an average human ear.  It includes a 40BP 1/4" pressure microphone and is individually calibrated with this specific microphone. It features a special damping system that extends its useful frequency range to 50 kHz. Its prepolarized equivalent is RA0404.  

The GRAS RA0404 is a hi-res ear simulator with an acoustic input impedance closely resembling that of an average human ear.  It includes a 40BD 1/4" pressure microphone and is individually calibrated with this specific microphone. It features a special damping system that extends its useful frequency range to 50 kHz. Its externally polarized equivalent is RA0403.