G.R.A.S. 43AC Ear Simulator Kit According to IEC 60318-4

Connection: 200 V/LEMO
Volume: 1260 @ 500 Hz
Dyn range: 25 dB(A) to 164 dB
ANSI: S3.7
IEC: 60318-4

The G.R.A.S. 43AC Artificial Ear is a complete test jig for acoustically testing earphones coupled to the ear via inserts such as tubes and ear moulds and complies with the following international requirements:

  • IEC 60318-4: Occluded-ear simulator for the measurement of earphones coupled to the ear by ear inserts.
  • ITU-T Recommendations P.57 (08/96) Series P: Telephone transmission quality, Objective measuringapparatus: Artificial ears.

The 43AC comprises:

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

Click here for more information about the RA0045-S1 Ear Simulator.

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
Set sensitivity @ 250 Hz (±2 dB) dB re 1V/Pa -38.5
Coupler volume 1260 @ 500 Hz
Resonance frequency kHz 13.5
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.57 Type 2
CE/RoHS compliant/WEEE registered Yes/Yes/Yes
Connector type 3 m 7-pin LEMO
Weight g / oz 1550 / 54.675

Typical frequency response for RA0045


G.R.A.S. RA0045 IEC 60711 Ear Simulator with microphone included
G.R.A.S. 26AC ¼" Preamplifier
G.R.A.S. RA0052 Test Jig
G.R.A.S. GR0435 In-ear Adapter
G.R.A.S. GR0436 Tube stud
G.R.A.S. GR0437 Ear-mould Simulator
G.R.A.S. GR0438 Union nut
G.R.A.S. GR0440 Tube stud
G.R.A.S. GR0433 Calibration Adapter
G.R.A.S. GR0434 Stop Washer


G.R.A.S. 12AK Power Module
G.R.A.S. 42AA Pistonphone


G.R.A.S. RA0196 High-tension springs (set of two)