G.R.A.S. Sound & Vibration A/S

G.R.A.S. is known for the world class measurement microphones - and not without reason. We design and manufacture an extensive range of products to cover virtually all front-end equipment needed for the precise and reliable measurement and recording of acoustic signals; from the transducer to the input of an A/D converter.

Company details

Skovlytoften 33 , Holte , DK-2840 DK Denmark

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Business Type:
Industry Type:
Health and Safety - Noise and Vibration
Market Focus:
Internationally (various countries)
Year Founded:

Pioneering spirit, passion, and world-class expertise

A very special kind of pioneering spirit, a profound professional pride and a grasp of physics beyond the ordinary. The story of G.R.A.S. Sound & Vibration is the story of world-class measurement microphones and the strong, international acknowledgement of the founder Gunnar Rasmussen.


Since the establishment in 1994, G.R.A.S. have been 100% dedicated to developing and manufacturing high-quality measurement microphones and related acoustic equipment. Founded by the Danish acoustics pioneer Gunnar Rasmussen who for more than 60 years has contributed to the world of sound and vibration with his unique ideas and designs. From the first reproducible 1” condenser measurement microphone that enabled quality measurements and instrumentation for acoustic calibration, Mr. Rasmussen’s ingenuity and foresight led to the world’s most popular acoustic sensor: The 1/2” measurement microphone. Then the 1/4” and 1/8” microphones followed with outstanding dynamic and high-frequency capability that brought higher definition and transparency into impulse noise diagnostics. Many variants have been made available over the years; all based on Gunnar Rasmussen’s original 1” pressure microphone design.


At G.R.A.S., we and our customers benefit daily from Mr. Rasmussen’s exceptional understanding of acoustics, physics, electronics and measurement needs. Not only in R&D but throughout the organisation, we are proud to develop, produce and offer the broadest range of high-quality measurement microphones and accessories in the industry. And as a family company, now owned and managed by the two sons, Per Rasmussen and Peter Wulf-Andersen, we safeguard our heritage and knowledge to help create new opportunities with our customers. We work with everybody with an interest in sound or noise within the fields of aerospace, automotive, audiology, consumer electronics, noise monitoring, building acoustics and telecommunications, metrology, education, consultancy, legislation and system integration.


All our microphones are solely produced in stainless steel and in a quality that allows for a 5 year warranty. Should you by mistake damage the diaphragm on a G.R.A.S. microphone, our special technique enables repair at very reasonable price.

G.R.A.S. is ISO 9001:2008 certified.