Understanding STC and SRI Ratings

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What does the Sound Transmission Class (STC) measure?

The level of annoyance due to low-frequency noise

The level of annoyance due to music

The level of annoyance due to speech sounds (correct)

The level of annoyance due to machinery noise

What is the ISO equivalent of the STC in the US?

Sound Reduction Class (SRC)

Sound Reduction Index (SRI) (correct)

Noise Reduction Coefficient (NRC)

Noise Attenuation Factor (NAF)

What are the two most basic principles for improving the sound transmission class of a partition?

Increasing the overall thickness and decreasing mass

Decreasing the overall thickness and mass

Increasing the overall thickness and adding insulation

Adding mass and increasing the overall thickness (correct)

What does a higher Sound Transmission Class (STC) number indicate?

More effective sound insulation Signup and view all the answers

How does the sound transmission class of a double wythe wall compare to a single wall with equivalent mass?

The double wythe wall has greater sound transmission class Signup and view all the answers

What is the range of frequencies that elicit an auditory percept in humans?

20 Hz - 20 kHz Signup and view all the answers

What are sound waves above 20 kHz known as?

Ultrasound Signup and view all the answers

What is the interdisciplinary science that deals with the study of mechanical waves in gasses, liquids, and solids?

Acoustics Signup and view all the answers

What is the application of acoustics that deals with the recording, manipulation, mixing, and reproduction of sound?

Audio signal processing Signup and view all the answers

What is the term for sound waves below 20 Hz?

Infrasound Signup and view all the answers

Understanding STC and SRI Ratings

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Questions and Answers

What does the Sound Transmission Class (STC) measure?

What is the ISO equivalent of the STC in the US?

What are the two most basic principles for improving the sound transmission class of a partition?

What does a higher Sound Transmission Class (STC) number indicate?

How does the sound transmission class of a double wythe wall compare to a single wall with equivalent mass?

What is the range of frequencies that elicit an auditory percept in humans?

What are sound waves above 20 kHz known as?

What is the interdisciplinary science that deals with the study of mechanical waves in gasses, liquids, and solids?

What is the application of acoustics that deals with the recording, manipulation, mixing, and reproduction of sound?

What is the term for sound waves below 20 Hz?

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