ISVR Consultancy Services http://www.isvr.co.uk/
Self-supporting advisory unit within the Institute of Sound and Vibration Research at the University of Southampton in the UK, involved in teaching, research and consultancy in sound and vibration.
NPL Acoustics http://www.npl.co.uk/npl/acoustics/
Our most fundamental role is to develop and maintain primary measurement standards for sound in air and water across a wide range of frequencies, from the infrasonic to tens of megahertz.