Frequently Asked Questions Q. What is the difference between sound absorption (NRC), sound transmission loss (STC), and impact sound transmission (IIC)? The following is a…
Frequently Asked Questions Question: How is NRC calculated? Noise Reduction Coefficient (NRC) is a single number rating defined by the ASTM standard C423, the laboratory method…
This article was published in the Journal of American Organbuilding (June 2012). Special Thanks to Jack Bethards of Schoenstein & Co. Organ Builders, Acoustone, MDC…
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