G.R.A.S. 46AQ 1/2'' CCP Random Incidence Standard Microphone Set

Freq range: 3.15 Hz to 12.5 kHz
Dyn range: 17 dB(A) to 138 dB
Sensitivity: 50 mV/Pa
  • 46AQ 1/2'' Random Incidence Set


The 46AQ is a 1/2" CCP microphone set for random-incidence measurements. Read about the LEMO equivalent [46AR]

The set consists of the 1/2" random-incidence microphone 40AQ and the 1/2" preamplifier 26CA with a BNC coaxial connector.

This combination was chosen to save you time and give you the best possible properties and reliability in the microphone/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.

The signal wire in the CCP transducer is used for reading the TEDS information directly from the transducer.

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

Typical applications and use

The 46AQ is optimized to measure sound correctly in random, diffuse, and reverberant sound fields.


The 46AQ uses BNC 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) 17
Dynamic range upper limit with G.R.A.S. CCP preamplifier dB 138
Set sensitivity @ 250 Hz (±2 dB) mV/Pa 50
Set sensitivity @ 250 Hz (±2 dB) dB re 1V/Pa -26
Output impedance Ω <50
Output Voltage Swing, min. @ 24-28 V CCP voltage supply Vp 8
Power supply min. to max. mA 2 to 20
DC bias voltage, typ. V 12
Microphone venting Rear
IEC 61094-4 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 -0,011
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 BNC
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.

Free-field corrections for different angles of incidence

 Optional items

G.R.A.S. AA0035

3 m BNC - BNC Cable

G.R.A.S. AA0039-CL

Customized length BNC - BNC Cable

G.R.A.S. AL0008

1/2" Microphone Holder, POM

G.R.A.S. AL0012

1/2" Microphone Holder, Stainless Steel

G.R.A.S. AL0005

Swivel head

G.R.A.S. AL0006


G.R.A.S. RA0020

1/2" Nosecone

G.R.A.S. AM0069

Windscreen for 1/2" Microphones

G.R.A.S. RA0131

1/2'' Rain protection cap

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

G.R.A.S. 42AB

Sound Calibrator, Class 1

G.R.A.S. 42AP

Intelligent Pistonphone, Class 0