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Home Recording Studio: Build It Like the Pros, Second Edition by Rod Gervais

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Chapter 3. Isolation Techniques—Understanding the Concepts

First, please don’t get too hung up on the term “STC ratings.” STC (Sound Transmission Class) rating is a single-number rating used to compare different assemblies, based on the reduction in noise levels that the assembly provides. Partition sound transmission losses are measured by using ASTM E 90 “Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements” and are calculated using ASTM E 413 “Classification for Rating Sound Insulation.”

The higher the STC rating is, the better the sound isolation value of the assembly will be. However, STC ratings were really designed and intended for the frequencies dealing with human speech ...

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