GRAS 43AC-S7 Hi-Res Ear Simulator Kit CCP

Connection: 0 V/CCP
Volume: 1260 @ 500 Hz
Dyn range: 44 dB(A) to 166 dB
ANSI: S3.7
IEC: 60318-4

GRAS 43AC-S7 Hi-Res Ear Simulator Kit CCP


The GRAS 43AC-S7 Ear Simulator Kit is a complete test jig for acoustically testing earphones coupled to the ear via inserts such as tubes and ear molds and is compatible with the following international requirements:

  • IEC 60318-4: Occluded-ear simulator for the measurement of earphones coupled to the ear by ear inserts.

43AC-S7 uses the RA0404 Hi-Res Ear Simulator which extends the useful frequency range to 50 kHz. Read more abot the RA0404 here.

The 43AC-S7 comprises:

The Test Jig has an adjustable spring-loaded arm to exert a variable force on the test object.

An externally polarized version is available, GRAS 43AC-S6.

TEDS Compatibility

43AC.-S7 is IEEE 1451.4 TEDS v. 1.0 compliant. If your measurement platform supports Transducer Electronic Data Sheets (TEDS), you will be able to read and write data like properties and calibration data.


Theoretical dynamic range lower limit with GRAS preamplifier
Theoretical dynamic range upper limit with GRAS preamplifier @ +28 V / ±14 V power supply
Set sensitivity @ 250 Hz (±2 dB)
Set sensitivity @ 250 Hz (±2 dB)
dB re 1V/Pa
Set sensitivity @ 250 Hz (±3 dB)
Coupler volume
1260 @ 500 Hz
Resonance frequency
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
IEC standard
60318-4 (former 60711)
CE/RoHS compliant/WEEE registered
Connector type
Microdot 10/32
g / oz
1550 / 54.675

Ny tolerance red

Fig 1. The transfer impedance of a typical RA0404 Hi-Res Ear Simulator with tolerances. Up to 10 kHz, the response is within the limits defined by IEC 60318-4.  Above 10 kHz, the response is within a fairly tight tolerance band up to 50 kHz

Ordering info


GRAS RA0404 Hi-Res Ear Simulator (prepolarized)
GRAS 26CB ¼" Preamplifier
GRAS RA0001 Right Angled Adapter
GRAS RA0052 Test Jig
GRAS GR0435 In-ear Adapter
GRAS GR0436 Tube stud
GRAS GR0437 Ear-mould Simulator
GRAS GR0438 Union nut
GRAS GR0440 Tube stud
GRAS GR0433 Calibration Adapter
GRAS GR0434 Stop Washer
GRAS MI0070  Cord 0.2 m


GRAS 12AK Power Module
GRAS 42AA Pistonphone


GRAS RA0196 High-tension springs (set of two)

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


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