G.R.A.S. 46AR 1/2'' LEMO Random Incidence Standard Microphone Set

Freq range: 3.15 Hz to 16 kHz
Dyn range: 19 dB(A) 149 dB
Sensitivity: 50 mV/Pa
  • 46AR 1/2'' Random Incidence Set


The 46AR is a ½" LEMO microphone set for random-incidence measurements. Read about the CCP equivalent [46AQ]

The set consists of the ½" random-incidence microphone 40AR and the ½" preamplifier 26TK with a 7-pin LEMO connector.

This combination was chosen to save you time and give you the best possible properties and reliability in the microphone and preamplifier match. Your workflow is optimized and typical handling errors are minimized.

Not only have we made a set of the best possible combination of microphone and preamplifier, we have also included TEDS, the Transducer Electronic Data Sheet standard according to IEEE-1451.4. Multi-channel users appreciate having an intelligent transducer, like 46AF, that can supply properties, types, and calibration data directly to measurement platforms that support TEDS.

46AR is individually factory-calibrated and delivered with a calibration chart stating its specific open-circuit sensitivity and pressure frequency response.

Typical applications and use

40AR can be used in measurements of diffuse-fields, inside vehicles, and precision acoustics.


The 46AR uses a 7-pin LEMO connector, which requires an input module that supports this technology.

For more information, see System Setup.

System verification

For daily verification and check of your measurement setup, we recommend using a calibrator like G.R.A.S. Sound Level Calibrator 42AB

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

Quality and warranty

All G.R.A.S. microphone sets are made of high-quality materials that will ensure life-long stability and robustness. The microphone sets 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.

Learn more about G.R.A.S.' unique warranty policies.


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.

Learn more about G.R.A.S.' service program.


Before leaving the factory, all G.R.A.S. microphone sets are calibrated as a unit in a controlled laboratory environment using traceable calibration equipment. The sets are delivered with calibration charts including sensitivity values and frequency response graphs for the complete set. You can use the sensitivity value directly in your system setup.

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

Learn more about G.R.A.S.' calibration services.

TYPE (Microphone features) RI
Frequency range (±1 dB) Hz 12.5 to 8 k
Frequency range (±2 dB) Hz 3.15 to 12.5 k
Frequency range (±3 dB) Hz 3.15 to 16 k
Dynamic range lower limit with G.R.A.S. preamplifier dB(A) 19
Dynamic range upper limit with G.R.A.S. preamplifier @ +28 V / ±14 V power supply dB 142
Dynamic range upper limit with G.R.A.S. preamplifier @ +120 V / ±60 V power supply dB 149
Set sensitivity @ 250 Hz (±2 dB) mV/Pa 50
Set sensitivity @ 250 Hz (±2 dB) dB re 1V/Pa -26
Output impedance Ω 75
Power supply min. to max. (single/balanced) V 28 to 120 / ± 14 to ± 60
DC-offset, min., single suppy V 0.5 x Vs - 1
DC-offset, max., single suppy V 0.5 x Vs + 4
DC-offset, balanced supply V -1 to 4
Microphone venting Rear
IEC 61094 Compliance WS2P/D
Temperature range, operation °C / °F -30 to 70 / -22 to 158
Temperature range, storage °C / °F -40 to 85 / -40 to 185
Temperature coefficient @250 Hz dB/°C / dB/°F -0.01 / -0.006
Static pressure coefficient @250 Hz dB/kPa -0.014
Humidity range non condensing % RH 0 to 100
Humidity coefficient @250 Hz dB/% RH -0.001
Influence of axial vibration @1 m/s² dB re 20 µPa 62
TEDS UTID (IEEE 1451.4 ) 27 v. 1.0
Connector type 7-pin LEMO (FGG.1B.307)
CE/RoHS compliant/WEEE registered Yes / Yes/Yes
Weight g / oz 33 / 1.164

Typical frequency response. Upper curve shows response in a diffuse sound field (random incidence), lower curve shows pressure response.

Optional items

G.R.A.S. 42AA

Pistonphone, Class 1

G.R.A.S. 42AP

Intelligent Pistonphone, Class 0

G.R.A.S. 12AA

2-Channel LEMO Power Module with gain, filters and Syscheck generator

G.R.A.S. 12AK

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

G.R.A.S. 12AQ

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

G.R.A.S. AA0008

3 m LEMO-to-LEMO cable

G.R.A.S. AA0009

10 m LEMO-to-LEMO cable

G.R.A.S. AA0020-CL

Customized length LEMO 7-pin - LEMO 7-pin Cable