G.R.A.S. 45BC-10 KEMAR with Mouth Simulator and Anthropometric Pinnae for Headset Test, 2-Ch CCP

Connection: CCP
Channel(s): 2
ANSI: S3.36, S3.25
IEC: 60318-4, based on 60318-7
Based on ITU-T Rec. P.57 Type 3.3 and ITU-T Rec. P.58
Special feature: Built-in power amplifier for mouth simulator


The KEMAR head and torso simulator was introduced by Knowles in 1972 and quickly became the industry standard for hearing-aid manufacturers and research audiologists (visit KEMAR.us to read the full story). It is based on worldwide average human male and female head and torso dimensions. It meets the requirements of ANSI S3.36/ASA58-2012 and IEC 60318-7:2011.

The current KEMAR Head and Torso has the same dimensions and acoustical properties as the original KEMAR, but has been developed further by G.R.A.S. to meet the industry’s demand for realistic measurements of hearing aids, headphones and headsets. It provides acoustic diffraction similar to that encountered around the median human head and torso, both in the proximity and in the far field.

As all the preconfigured 45BB KEMARs consist of the same basic 45BB KEMAR Non-configured, plus a set of application specific accessories, the full information about a given KEMAR configuration is obtained by combining the information about the 45BB KEMAR Non-configured and the information for a given configured version as found in the present text. Read about the non-configured KEMAR here.


The 45BC-10 is a KEMAR with prepolarized ear simulators and anthropometric pinnae for 2-channel ear and headphone test.

It is delivered fully configured, individually calibrated and ready for use. In addition to a system calibration certificate, a USB flash memory with simulation data is included.

The main configuration specific components of the 45BC-10 are the G.R.A.S. RA0045-S1 Ear Simulator According to 60318-4 and the KB5000/KB50001 Anthropometric Pinnae.

The 44AA Mouth Simulator according to ITU-T Rec. P51 with built-in power amplifier

The maximum continuous signal the mouth can produce in 1/3-octave bands is 100dB re. 20µPa in the frequency range 100Hz to 16kHz. Its loudspeaker accepts an external signal either directly or via its own built-in power amplifier (when power is applied).

The 60318-4 Ear Simulator

The acoustic input impedance of the RA0045-S1 Ear Simulator closely resembles that of the human ear and, as a result, loads a sound source in very much the same way.

It complies with IEC 60318-4 and is measured and calibrated according to ITU-T P.57. It embodies a number of carefully designed volumes connected via well-defined and precisely tuned resistive grooves. In an equivalent electrical circuit, capacitors would represent the volumes, and inductance and resistance would represent respectively air mass and air flow within the resistive groves.

It is delivered with a built-in G.R.A.S. 40A0 1/2" prepolarized pressure microphone.

Read more about RA0045-S1 Ear Simulator.

The Anthropometric Pinna

Compared to the standardized pinna, the anthropometric pinna embodies a number of improvements to the concha and ear canal, combined with increased collapsability of the helix, and improved mounting. It is made of soft silicone, 35 Shore OO hardness.

The external shape of the pinna is identical to that of the standardized KEMAR pinna, but concha and ear canal have been modified so that they closely mimic the properties of a real human ear. The ear canal has been extended and is now an integral part of the pinna, which seals directly against the ear simulator. Like the human ear, the ear canal has the 1st and 2nd bend, and the interface with the concha is oval. Fit and insertion consistency are much improved over the cylindrically or conically shaped ear canal extensions that are used with the standardized pinna.

The flexibility of the outer ear has been improved, and when mounting supra-aural and circum-aural headphones the pinna now collapses against the head very much like a human ear.

In addition to the traditional push mounting from the outside, the pinna is secured with two screws from the inside of KEMAR's head. These two screws ensure that the pinna is held firmly in place. Therefore, it seals perfectly against the ear simulator and the head, and it is therefore possible to mount and dismount DUTs repeatedly without compromising the seal.

Read more about the Anthropometric Pinnae.

Typical Applications

The anatomical shape of the pinna makes it possible to achieve excellent fit and sealing with anatomically shaped in-ear transducers.

Controlling the insertion depth is easy, leading to good insertion consistency and highly improved repeatability and accuracy of measurements.

The improved fit and seal also means that the low frequency response is improved. It will allow you to reproduce bass notes, as well as effectively measure (active & passive) attenuation.

Therefore, the 45BC-10 KEMAR is ideal for accurate and repeatable testing of headphones, earphones and in-ear hearing protectors. In addition to this, the built-in mouth simulator makes it ideal for accurate and repeatable testing of headsets..

Performance and warranty

KEMAR is made of components from our standard portfolio and are all manufactured of high-quality material and branded parts that were chosen and processed to ensure life-long stability and robustness. This, enables us to offer 2 years warranty against defective materials and workmanship.
Exceptions: Microphones included in KEMAR as for these our normal 5 year warranty apply. The warranty period for cables is 6 months.

Connector type BNC
Set sensitivity @ 250 Hz (±2 dB) mV/Pa 12.5
Set sensitivity @ 250 Hz (±2 dB) dB re 1V/Pa -38.5
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 151
Theoretical dynamic range upper limit with G.R.A.S. CCP preamplifier dB 146
Resonance frequency kHz 13.5
Temperature range, operation °C / °F -30 to 60 / -22 to 140
Temperature range, storage °C / °F -40 to 65 / -40 to 149
Humidity range non condensing % RH 0 to 95%
ANSI standard S3.36, S3.25
IEC standard 60318-7
ITU-T recommondations P. 58
Weight g / oz 11.45 k / 404
Output impedance Ω 8
Maximum power, continuous W 10
Maximum power, pulsed 2 sec. W 50
Input impedance 20
Gain dB 10
Input signal, max. Vrms 2
Power supply, external Vdc 24
G.R.A.S. Sound & Vibration reserves the right to change specifications without notice.

Included items

G.R.A.S. 45BC

KEMAR Head & Torso with G.R.A.S. 44AA Mouth Simulator, non-configured

G.R.A.S. KB5000

KEMAR Large Right Anthropometric Pinna 35 Shore OO

G.R.A.S. KB5001

KEMAR Large Left Anthropometric Pinna 35 Shore OO

G.R.A.S. GR0408

External Ear Canal (for calibration, 2 pcs)

G.R.A.S. GR0409

Union Nut (for GR0408, 2 pcs)

G.R.A.S. GR1874

Ear Simulator Holder (2 pcs)

G.R.A.S. RA0045-S1

IEC 60318-4 Ear Simulator, (Prepol.version, 2 pcs)

G.R.A.S. 26CS

1/4" CCP Standard Preamplifier with Microdot Connector, Very Short (2 pcs)

G.R.A.S. RA0001

Right Angled Adapter for 1/2" Microphone and 1/4" Preamplifier (2 pcs)

G.R.A.S. AA0018-S

Microdot-BNC Cable, 35 cm (2 pcs)

G.R.A.S. AA0035

3 m BNC - BNC Cable (2 pcs)

G.R.A.S. 46BD

1/4" CCP Pressure Standard Microphone Set

G.R.A.S. AA0070

Microdot-BNC Cable, 3 m


Optional items

Power Modules for Pre-polarized Ear Simulators and Microphones

G.R.A.S. 12AL

1-Channel CCP Power Module with A-weighting filter 

G.R.A.S. 12AQ

2-Channel Universal Power Module with signal conditioning and PC interface


For Ear Simulator Calibration

G.R.A.S. 42AP

Intelligent Pistonphone (250 Hz or 251.2 Hz, 114 dB +/- 0.05 dB)

G.R.A.S. 42AA

Pistonphone (250 Hz, 114 dB +/- 0.08 dB)


Pinna Simulators

G.R.A.S. KB5000

Large Right Anthropometric Pinna 35 Shore OO

G.R.A.S. KB5001

Large Left Anthropometric Pinnar 35 Shore OO

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. 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. 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. KB1090

KEMAR Large Right Ear (VA-Style) 35 Shore OO 

G.R.A.S. KB1091

KEMAR Large Left Ear (VA-Style) 35 Shore OO 


Ear Mould Simulators

G.R.A.S. KB0110

Ear Mould Simulator for 2 mm inner diameter tubing 

G.R.A.S. KB0111

Ear Mould Simulator for 3 mm inner diameter tubing


Ear Canal Extension and Microphone Holder Kits (kits with 2 pcs and O-rings)

G.R.A.S. RA0237

Straight Ear Canal Extension Kit for KEMAR 

G.R.A.S. RA0238

VA-tapered Ear Canal Extension Kit for KEMAR 

G.R.A.S. RA0239

Ear Canal Extension Kit w. silicone lining for KEMAR

G.R.A.S. RA0240

Holder for long 1/2" microphone Kit for KEMAR 

G.R.A.S. RA0241

Holder for short 1/2" microphone Kit for KEMAR

G.R.A.S. RA0243

Holder for 1/4" microphone Kit for KEMAR

G.R.A.S. RA0244

O-ring kit for KEMAR, 2 pcs. 

G.R.A.S. RA0249 Straight Ear Canal Extension Kit for KEMAR,
made of POM, for binaural hearing aid test
G.R.A.S. RA0250 Tapered Ear Canal Extension Kit for KEMAR,
made of POM, for binaural hearing aid test


KEMAR Retrofit Kit for Binaural Hearing Aid Test

G.R.A.S. RA0251

KEMAR Retrofit Kit for Binaural Hearing Aid Test.

The Kit includes Ear Holder Plates, mounting bolts and the RA0249 and RA0250 Ear Canal Extension Kits.
Included items are made of POM, Nylon and Teflon.


Extension Cables

G.R.A.S. AA0034

BNC-BNC Cable, 2 m

G.R.A.S. AA0035

BNC-BNC Cable, 3 m 

G.R.A.S. AA0036

BNC-BNC Cable, 5 m

G.R.A.S. AA0037

BNC-BNC Cable, 10 m 

G.R.A.S. AA0039-CL

BNC-BNC Cable, Customized Length, xxxx cm 


Flight Case

G.R.A.S. KM0094

 PELI Case for KEMAR


Stand for KEMAR

G.R.A.S. AL0026

 Loudspeaker stand for KEMAR, Ø 35 mm



G.R.A.S. KB0000

KEMAR Handbook 

G.R.A.S. KB0010

T-Shirt for KEMAR 

G.R.A.S. Sound & Vibration reserves the right to change accessories without notice.