Soundmaster (Noise Barriers LLC) www.dynotestcells.com +1 800 472 5952 2001 Kelley Court, Libertyville, IL, 60048, USA Soundmaster (Noise Barriers LLC) www.dynotestcells.com +1 800 472 5952 2001 Kelley Court, Libertyville, IL, 60048, USA Serving the Industry since 1960, Soundmaster Dynamometer Test Cells are pre-engineered modular test cells, specifically designed to work with dynamometers and provide proper ventilation. They can provide in excess of 40 dBA sound reduction, with guaranteed performance. Contact Us Contact Us Latest News