GRAS 45BB-3 KEMAR Head & Torso for Sound Quality Recording, 2-Ch LEMO

Connection: Traditional Power Supply (200 V/LEMO)
Channel(s): 2
ANSI: S3.36
ITU-T Rec. P.57 Type 3.3
based on ITU-T Rec. P.58

Technology

 Introduction

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 GRAS 45BB KEMAR Head and Torso has the same dimensions and acoustical properties as the original KEMAR, but has been developed further by GRAS 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.

Design

The 45BB-3 is a KEMAR head and torso for 2-channel sound quality recording, with externally polarized ½” pressure microphones.

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 45BB-3 are the GRAS 40AG ½” pressure microphones and the KB0090/KB0091 large tapered (VA-style) pinnae.

The 40AG 1/2" Ext. Polarized Pressure Microphones

The 40AG is an IEC 61094 WS2P ½" externally polarized pressure microphone with rear-venting. It is a high-precision condenser microphone made according to IEC 61094-4. It is extremely robust and reliable and can measure sound pressure levels up to 160 dB within 3.15 Hz to 20 kHz.

Read more about 40AG here.

The KB0090/KB0091 Pinna

The KB0090 and KB0091 are large VA-style pinnae. The hardness is 55 Shore 00 and they comply with IEC 60318-7.

Other accessories for this configuration are listed in the Ordering Info tab.

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.

Specifications

Connector type
7-pin LEMO (FGG.1B.307)
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 GRAS preamplifier
dB(A)
25
Theoretical dynamic range upper limit with GRAS preamplifier @ +28 V / ±14 V power supply
dB
151
Theoretical dynamic range upper limit with GRAS preamplifier @ +120 V / ±60 V power supply
dB
163
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
60318-4 (former 60711), 60318-7 (former 60959)
ITU-T recommondations
P.380
Weight
g / oz
11.45 k / 404
Specification Conditions

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

Ordering info

Included items

GRAS 45BB

KEMAR Head & Torso, non-configured

GRAS KB0090

KEMAR Large Right Ear 55 Shore OO (VA/SQ)

GRAS KB0091

KEMAR Large Left Ear 55 Shore OO (VA/SQ)

GRAS RA0241

Holder for short 1/2" Microphone Kit for KEMAR (2 pcs)

GRAS 40AG

1/2" Ext. Polarized Pressure Microphone, High Frequency (2 pcs)

GRAS 26AS

1/4" Preamplifier, Short version with 0.4 m cable (2 pcs)

GRAS RA0003

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

GRAS AA0008

LEMO 7-pin - LEMO 7-pin Cable, 3 m (2 pcs)

 

Optional items

Power Modules for Externally Polarized Ear Simulators and Microphones

GRAS 12AK

1-Channel Power Module with gain, filters and SysCheck generator

GRAS 12AD

1-Channel Power Module

GRAS 12AA

2-Channel Power Module with gain, filters and SysCheck generator

GRAS 12AR

2-Channel Power Module 

GRAS 12AQ

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

 

For Ear Simulator Calibration

GRAS 42AP

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

GRAS 42AA

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

GRAS RA0157

1/2" Calibration Adapter for KEMAR Pinna

 

Pinna Simulators

GRAS KB0060-S1

KEMAR Small Right Pinna for SQ, 55 Shore OO

GRAS KB0061-S1

KEMAR Small Left Pinna for SQ, 55 Shore OO

GRAS KB1060-S1

KEMAR Small Right Pinna for SQ, 35 Shore OO

GRAS KB1061-S1

KEMAR Small Left Pinna for SQ, 35 Shore OO

GRAS KB0060

KEMAR Small Right Ear 55 Shore OO

GRAS KB0061

KEMAR Small Left Ear 55 Shore OO

GRAS KB0065

KEMAR Large Right Ear 55 Shore OO 

GRAS KB0066

KEMAR Large Left Ear 55 Shore OO

GRAS KB1060

KEMAR Small Right Ear, 35 Shore OO 

GRAS KB1061

KEMAR Small Left Ear 35 Shore OO

GRAS KB1065

KEMAR Large Right Ear 35 Shore OO 

GRAS KB1066

KEMAR Large Left Ear 35 Shore OO

GRAS KB0090

KEMAR Large Right Ear (VA-Style/SQ) 55 Shore OO 

GRAS KB0091

KEMAR Large Left Ear (VA-Style/SQ) 55 Shore OO

GRAS KB1090

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

GRAS KB1091

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

GRAS KB5000

KEMAR Large Right Anthropometric Concha and Canal Pinna 55 Shore OO 

GRAS KB5001

KEMAR Large Left Anthropometric Concha and Canal Pinna 55 Shore OO

 

Ear Mould Simulators

GRAS KB0110

Ear Mould Simulator for 2 mm Inner diameter tubing 

GRAS KB0111

Ear Mould Simulator for 3 mm Inner diameter tubing

 

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

GRAS RA0237

Straight Ear Canal Extension Kit for KEMAR 

GRAS RA0238

VA-tapered Ear Canal Extension Kit for KEMAR 

GRAS RA0239

Ear Canal Extension Kit w. silicone lining for KEMAR

GRAS RA0240

Holder for long 1/2" Microphone Kit for KEMAR 

GRAS RA0241

Holder for short 1/2" Microphone Kit for KEMAR

GRAS RA0243

Holder for 1/4" Microphone Kit for KEMAR

GRAS RA0244

O-ring kit for KEMAR, 2 pcs. 

GRAS RA0249 Straight Ear Canal Extension Kit for KEMAR,
made of POM, for binaural hearing aid test
GRAS RA0250 Tapered Ear Canal Extension Kit for KEMAR,
made of POM, for binaural hearing aid test

 

KEMAR Retrofit Kit for Binaural Hearing Aid Test

GRAS 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.

 

KEMAR Retrofit Kit for Anthropometric Concha and Canal Pinna

GRAS RA0311

KEMAR Retrofit Kit for Anthropometric Concha and Canal Pinna.

The Kit includes Ear Simulator Holder, 2 finger screws and a 3 mm Allen Key.

 

Extension Cables

GRAS AA0008

LEMO 7-pin - LEMO 7-pin Cable, 3 m 

GRAS AA0009

LEMO 7-pin - LEMO 7-pin Cable, 10 m

GRAS AA0020-CL

LEMO 7-pin - LEMO 7-pin Cable,Customized Length, xxxx cm

 

Flight Case

GRAS KM0094

 PELI Case for KEMAR

 

Simulation Model of KEMAR

GRAS KB3000

Simulation Model of 45BB KEMAR with large pinnae

GRAS KB3001

Simulation Model of 45BB KEMAR with small pinnae

 

Stand for KEMAR

GRAS AL0026

 Loudspeaker Stand for KEMAR, Ø 35 mm

 

Miscellaneous

GRAS KB0000

KEMAR Handbook 

GRAS KB0010

T-Shirt for KEMAR 

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

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