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The world’s smallest measurement microphone set

Ideal for many different applications

GRAS is proud to present the 46DE - the only microphone set where no parts are larger than 1/8”. Because of its small size and low sensitivity, it is ideal for measuring high frequencies and high sound pressure levels and additionally it can be used where you previously could not get access.

It can be used for a wide range of applications including impulsive noise measurements (like gunshot and airbag), aircraft turbulence, flow measurements or scale model measurements. Also large numbers of 46DE microphone sets can be mounted closely together for very high spatial resolution - the possibilities are endless.

Download the brochure

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Breaking a size barrier

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How did we manage to make the 46DE so small?

We have developed a 1/8" preamplifier consisting of a very small input section, 1/8" in diameter, which is attached to the microphone, with the larger (Ø 5.5 mm.) output section at the other end of the specially designed cable. In this way, the section of the preamplifier that is close to the microphone is kept very small while the more space-demanding electronics in the output stage are located at the other end of a long cable.* However, customized lengths are available.

Explore the new 46DE

Helping the internationally recognized DELFT University

Exploring new ways to measure

Reducing trailing edge noise emitted by wind turbines and aircraft on approach represents a special design challenge for developers. Because of the turbulent nature of this noise, it is difficult to predict the effects of noise reduction measures based on numerical simulations, and therefore measurements are essential. In collaboration with Delft University of Technology in The Netherlands, GRAS is testing how 46DE can contribute to the analysis of trailing noise reduction measures such as serrated edges and meshes. 46DE’s small size means that it will unprecedented allow for analysis of pressure fluctuations at trailing edges of geometries of the order of 1 mm as well in fully porous configurations.

Read the background paper here

46DE Figure 

Ideal for many different applications

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Made for versatility

The 46DE is a pressure microphone set and as such optimized for acoustic measurements of sound pressure at a boundary or a wall. Because of the microphone set being 1/8" it is also useful for up to at least 40 kHz free-field measurements without any compensation.

The microphone set can be used for a wide range of applications including impulsive noise measurements (like gunshot and airbag), aircraft turbulence, flow measurements or scale model measurements. Also large numbers of 46DE microphone sets can be mounted closely together for very high spatial resolution - the possibilities are endless. Because of its size it is also useful for high frequency free-field measurements.

Read the press release 

Ask the experts

We are ready to guide you with your measurement challenges

Feeling inspired to explore new ways to measure? With more than 20 years of experience with measurement microphones and related acoustic equipment, we are ready to guide you with your measurement challenges.

Contact us for advice 

* The cable is 1 m.

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