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

20 years' anniversary

We are celebrating our 20 years' anniversary and have documented the story of our founder, Gunnar Rasmussen.

The new Turbulence Screen - a success!

Designed for aeroacoustic testing in solid-walled wind tunnels, the new turbulence screen integrates the flush-mount and recessed mounting techniques with a special wire mesh into a single unit, and allows for adaptation of several mounting options.

Standards Specials Customized

Since 1994 we have been 100% dedicated to developing and manufacturing high-quality measurement microphones and related acoustic equipment. From our heritage derives the program of standard, special and customized solutions.

• Standards. Our base program of standardized measurement microphones and related acoustic equipment for general acoustic applications.
• Specials. Application specific measurement microphones based and build upon our standardized portfolio .
• Customized. An unique G.R.A.S. capability that extends our customers' choice to infinity by tailoring existing solutions or establishing customer development projects.

The new High-frequency coupler is released

Three kits are available:

Sound Power Hemispheres

The G.R.A.S. Hemisphere meets the requirements for a stable, simple-to-position soundpower setup. The Hemisphere is portable and provides tool-less assembly and accessibility to the DUT.

The Hemisphere complies with the standard ISO 3744, 3745 and 3746 and accommodates for 4, 10 and 20 positions – clearly marked to ease the mounting and to maintain measurement repeatability. The preconfigured kits include 4, 10 or 20 microphone sets in variants of C C P, LEMO and low-noise LEMO