G.R.A.S. 43AG Ear & Cheek Simulator Kit Based on IEC 60318-4 & -7

Connection: 200 V/LEMO
Volume: Complex
Dyn range: 25 dB(A) to 164 dB
ANSI: S3.7
IEC: 60318-4
  • 43AG Ear & Cheek Sim Kit IEC 60318-4 & -7


The GRAS 43AG Ear and Cheek Simulator Kit is a unique, multi-faceted and multi-purpose tool that helps you accomplish the job in an effective and efficient manner. We call it the table-top KEMAR as it offers you much of the KEMAR capability in a convenient and portable packaging.

Our vision for the 43AG is to assist you in all facets of the product development cycle: from R&D to EOL testing.

As your product is put together, your team needs to ensure that individual changes do not conflict with your overall vision. Much of this validation work can be accomplished at their desks, in real time, making you comfortable and giving you the stamp of approval of the final product.

Additionally, very few manufacturers have their entire production vertically integrated and are therefore highly dependent on the quality delivered by their sub-suppliers. To ensure the quality of the complete product, G.R.A.S. offers a variety of mobile test platforms that can easily be deployed at your supplier and in your own in-coming control department. The 43AG Ear and Cheek Simulator by GRAS provides that comfort and security knowing parts comply to the highest standards: yours.

A similar test fixture with CCP connection is available (G.R.A.S. 43AG-S1).

Typical applications and use

The 43AG is a multi-purpose tool and can for example be used to verify frequency response, distortion, isolation and leakage.

Its versatility means that it can be used for testing of both concha and insert types earphones. It can also be used for headphone and headset testing, both circumaural and supra-aural types. Also, all common types of hearing-aids, and telephone handset can be tested with the 43AG.

Tests can be performed according to the following standards:

  • IEC 60959
  • IEC 60318-4 (former IEC 60711)
  • ITU-T Rec. P.57 Type 2 Artificial Ear
  • ITU-T Rec. P.57 Type 3.3 Pinna Simulator


The 43AG requires an input module with a 7-pin LEMO connector and 200 V polarization voltage.

All KEMAR pinnae are available for the 43AG: small – large and left – right in "soft" and "normal" versions. VA-Style versions are also available.

System verification

For sensitivity calibration, we recommend using a pistonphone like G.R.A.S. 42AP Intelligent Pistonphone  or the G.R.A.S. 42AA Pistonphone.

Quality and warranty

All G.R.A.S. microphones are made of high-quality materials that will ensure life-long stability and robustness. The microphones are all assembled in verified clean-room environments by skilled and dedicated operators with many years of expertise in this field.

The microphone diaphragm, body, and improved protection grid are made of high-grade stainless steel, which makes the microphone resistant to physical damage, as well as corrosion caused by aggressive air or gasses.

This, combined with the reinforced gold-plated microphone terminal which guarantees a highly reliable connection, enables G.R.A.S. to offer 5 years warranty against defective materials and workmanship.


If you accidentally damage the diaphragm on a G.R.A.S. microphone, we can — in most cases — replace it at a very reasonable cost and with a short turn-around time. This not only protects your investment, but also pleases your quality assurance department because you don’t have to worry about new serial numbers, etc.


Before leaving the factory, all G.R.A.S. microphones are calibrated in a controlled laboratory environment using traceable calibration equipment.

Depending on the use, measurement environment, and internal quality control programs, we recommend recalibrating the microphone at least once a year.


Theoretical dynamic range lower limit with G.R.A.S. preamplifier dB(A) 25
Theoretical dynamic range upper limit with G.R.A.S. preamplifier @ +28 V / ±14 V power supply dB 153
Theoretical dynamic range upper limit with G.R.A.S. preamplifier @ +120 V / ±60 V power supply dB 164
Set sensitivity @ 250 Hz (±2 dB) mV/Pa 12.5
Set sensitivity @ 250 Hz (±2 dB) dB re 1V/Pa -38.1
Coupler volume Complex
Resonance frequency kHz 13.5 (ear sim)
Temperature range, operation °C / °F -30 to 60 / -22 to 140
Temperature coefficient @250 Hz dB/°C / dB/°F - 0.01 / -0.006
Humidity range non condensing % RH 0 to 75
ANSI standard S3.7
IEC standard 60318-4 (former 60711)
ITU-T recommondations P.380
CE/RoHS compliant/WEEE registered Yes/Yes/Yes
Connector type 3 m 7-pin LEMO
Weight g / oz 1.95 / 68.784


G.R.A.S. RA0045 Ear Simulator according to IEC 60318-4 (former 60711) (with integrated 1/2" pressure microphone)
G.R.A.S. 26AC 1/4" Standard Preamplifier with 3 m Integrated Cable
G.R.A.S. KB0065 Right KEMAR Pinna with hardness 55 Shore 00 (hard)
G.R.A.S. RA0150 Cheek plate
G.R.A.S. RA0052 Test Jig with mounting base and adjustable force clamp
G.R.A.S. RA0001 Right-angled adapter
G.R.A.S. RA0199 Finger Simulator


Power Supply & Signal Conditioning

G.R.A.S. 12AQ For both externally and prepolarized configurations: Power Module, dual-channel
G.R.A.S. 12AK For externally polarized configurations, Power Module, single-channel
G.R.A.S. 12AA For externally polarized configurations, Power Module, two-channel.
G.R.A.S. 12AU 1-Channel Power Module with Signal Conditioning and Power Amplifier


Pinna Simulators

G.R.A.S. KB0060 KEMAR Small Right Ear 55 Shore OO
G.R.A.S. KB0061 KEMAR Small Left Ear 55 Shore OO
G.R.A.S. KB0065 KEMAR Large Right Ear 55 Shore OO 
G.R.A.S. KB0066 KEMAR Large Left Ear 55 Shore OO
G.R.A.S. KB0090 KEMAR Large Right Ear (VA-Style/SQ) 55 Shore OO 
G.R.A.S. KB0091 KEMAR Large Left Ear (VA-Style/SQ) 55 Shore OO
G.R.A.S. KB1060 KEMAR Small Right Ear, 35 Shore OO 
G.R.A.S. KB1061 KEMAR Small Left Ear 35 Shore OO
G.R.A.S. KB1065 KEMAR Large Right Ear 35 Shore OO 
G.R.A.S. KB1066 KEMAR Large Left Ear 35 Shore OO
G.R.A.S. KB1090 KEMAR Large Right Ear (VA-Style) 35 Shore OO 
G.R.A.S. KB1091 KEMAR Large Left Ear (VA-Style) 35 Shore OO 


Calibration Equipment

G.R.A.S. RA0184 Force Gauge (0 - 25 N)
G.R.A.S. RA0157 1/2" Calibration Adapter for KEMAR pinnae (required for an 60318-4 (711) Configuration)
G.R.A.S. 42AP Pistonphone with built-in precision barometer (250 Hz or 251.2 Hz, 114 dB ±0.05 dB) (recommended)
G.R.A.S. 42AA Pistonphone (250 Hz, 114 dB ±0.08 dB)



G.R.A.S. AA0008 3-m Extension cable, 7-pin LEMO to 7-pin LEMO (for Power Modules 12AA, 12AK, and 12AQ)



G.R.A.S. RA0196 High-tension Spring Kit (only relevant for 43AG delivered before summer 2014 and only if higher tension is required)