Question #1: Is a “1 STC” difference equal to a “1 dB” difference? “An STC rating roughly equals the decibel (dB) reduction in noise volume a wall or partition can provide. For example, if an 80 dB sound on one side of a wall/floor/ceiling is reduced to 50 dB on the other side, that partition is said to have an STC of 30”

Sound Transmission Class (STC ) is an integer rating of how well a building partition attenuates airborne sound. In the USA, it is widely used to rate interior partitions, ceilings and floors, doors, windows and exterior wall configurations (see ASTM International Classification E413 and E90).

2023年3月30日 · Sound transmission class rating numbers give you a rough idea of how much sound is reduced in decibels (db). There is no exact correlation from STC rating to db, however, since materials block sounds of varying frequencies differently.

The difference between STC and Rw is the range of frequencies that are tested in order to determine dB reduction and how to factually use or interpret the resulting numbers. STC covers the range from 125 Hz to 4000 based on ASTM E-90 and E413 test procedures.

In general cases, an STC of 52 would equate to a 52 dB attenuation in sound. However, it is very important to note that STC is a weighted single integer rating of the attenuation from 125 Hz to 4000 Hz and does not represent the attenuation at specific frequencies.

1. Sound Transmission Class (STC) STC is a rating that measures how well a building partition (like a wall or floor) reduces sound transmission. It’s calculated based on how much sound is reduced across various frequencies, averaged into a single number. Higher STC ratings indicate better soundproofing. 2. Decibels (dB)

The scale of measurement used to simulate sound across the audible frequency range is denoted as dB. The human ear perceives changes in loudness caused by even small changes in those levels. Each 3dB increase doubles the sound reception and …

2025年3月7日 · Sound Transmission Coefficient (STC) – otherwise known as “Sound Transmission Class” – is the golden standard that evaluates how well a barrier, be it a wall, ceiling, door, or window, reduces airborne sound.

2025年3月18日 · Volume of sound is measured in decibels (dB) Frequency of sound is measured in hertz (Hz) STC-rated materials are more effective at different frequencies. For example, an STC-25 acoustic barrier blanket from Environmental Noise Control will reduce sound by 11 decibels (dB) when the frequency is around 100 Hz. However, it will reduce sound by 28 ...

2021年3月5日 · STCs are an average of the transmission loss (dB Loss) in a number of frequencies. As such, if you need high attenuation at a specific frequency, the STC alone will not be sufficient to determine if you are achieving it. STCs only factor in the transmission loss between 100 Hz and 4000 Hz.