GRAS releases a range of new acoustic sensors for automotive NVH testing

GRAS Sound & Vibration, the world leader in automotive acoustic sensors, today announced the launch of the GRAS 147AX CCP Rugged Pressure Microphone for engine noise testing and the GRAS 147EB CCP X-Rugged Microphone for wheelhouse brake noise testing. Together with the versatile GRAS 146AE CCP Free-field microphone, GRAS now has the strongest and most comprehensive range of microphones for all automotive NVH applications.

Developed closely together with global OEMs
Both new products are the result of close collaboration with leading industry players.

The 147AX CCP Rugged Pressure Microphone has been developed together with Volvo Cars in Sweden. It is a surface microphone optimized for cold and hot engine noise testing allowing for more efficient testing and repeatable measurements. Furthermore, it introduces a revolutionizing form factor, which together with a unique mounting system and new measurement methods, developed with Volvo Cars, ensures accurate and reliable data.

The 147EB CCP X-Rugged Microphone Set is an extremely robust microphone specially designed and optimized for on-road brake noise testing. The microphone has a three-layer protection of the diaphragm and has been tested with Volkswagen in Germany where it has undergone more than 10,000 miles of on-road testing on all surfaces and in all weather conditions.

According to Product Manager Jan Hansen “GRAS has come up with new products targeted at specific applications that revolutionize existing test methods and considerably save time rigging up. We have tried to address the most common challenges as experienced by industry professionals within each application area by way of mapping these from start to finish”.

Together with the standard 146AE ½” CCP Free-field Microphone Set, these new products make up a full portfolio of microphones covering all application areas within automotive NVH testing.

  • 147AX is recommended for cold and hot engine noise testing

  • 147EB is recommend for on-road brake noise testing

  • 146AE is recommended for testing pass-by noise, road noise, buzz, squeak and rattle noise as well as power train noise.

For further information, please contact:

Martin M. Khan
Global Marketing Director
Phone: +45 5157 3095

or write to This email address is being protected from spambots. You need JavaScript enabled to view it. / Download press release here

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