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There are a lot of terms used when considering noiseproofing solutions for residential and commercial applications. One is transmission loss, and it’s one of the most important measurements in determining a material’s effectiveness at isolating sound.

Transmission loss is the number of sound decibels that are stopped by a wall or other structure at a given frequency. In the graph below, the green line represents the transmission loss of a wall at different frequencies. For example, at 315 Hz the wall will prevent 41 decibels of sound of passing through to the other side of the wall.

Here’s a tip: pay close attention to transmission loss at low frequencies (below 125 Hz). A lot of noise that you will probably want to isolate—for example from home theaters to traffic—falls within these low frequencies. When comparing transmission loss of different walls, look for data taken at the same laboratory using the same conditions (same size wall, installation practices, etc.).

Here’s another tip: When you are researching noiseproofing products, transmission loss will tell you more than the STC rating. As the graphic above illustrates, the STC ratings only cover frequencies from 125 Hz to 4,000, so it’s not a reliable standard for measuring soundproofing for low frequencies. To learn more about STC ratings, see Understanding Sound Transmission Class (STC).