What is STC, and Why is it Important?

STC is a rating of how much sound is stopped by a partition, like a window or wall. It is a way to tell if one type of partion is better than another, without having to take someone's word for it. The higher the number, the better.

STC stands for Sound Transmission Class. It roughly indicates how many decibels can be stopped from passing through a partition. For a good explanation of the science, go to https://en.wikipedia.org/wiki/Sound_transmission_class

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Top 5 Questions to Ask when Shopping for Soundproofing

1. What is the STC (Sound Transmission Class) of the soundproof inserts? An STC rating is the industry standard for measuring sound abatement of building partitions like walls, windows and doors. It's the only rating that is not subjective, unlike percentages. The higher the number, the better the ability to block noise. For a good explanation of STC go to https://en.wikipedia.org/wiki/Sound_transmission_class

2. How does the sound abatement capability (the STC) of my soundproof inserts compare to my walls? In other words, if the inserts have a better STC than your walls, you need to know up front so you can set realistic expectations about the end result. For example, the STC rating for a typical residential brick veneer wall is in the 52 range. That means 

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The Difference between Frequency & Pitch


Most people are familiar with the word "Pitch", as in the high-pitched sound of the keys on the far right of a piano, or the low-pitched sound of the far left keys. But fewer people are familiar with the technical term "Frequency", although both words are often used in the same discussion - particularly discussions about how to stop unwanted sounds/noises.

From our ears' point of view, they are the same thing. High-frequency waveforms result in high-pitched sound. The same goes for mid, low or mixed waveforms. An 18-wheeler produces low-frequency waveforms resulting in a low pitch sound to our ears. Generally, traffic produces quite a range of pitches from sirens, to Harleys, and everything in-between. Barking dogs vary from the high pitch of small dog, to the low pitch of a big one.

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Why We Use Laminated Glass Instead of Acrylic

We offered 1/4" and 3/8" thick acrylic inserts for sound abatement from 2008 to 2011. But we decided to discontinue it because it disappointed too many of our customers who had mid-to-low frequency sound problems, i.e. big trucks, big motorcycles, big dogs, train rumble, a/c units, etc. Laminated glass inserts worked much better in all frequencies Now, we only use 1/4" acrylic in cases where the soundproof insert is required to bend.

A little history: When we first started producing soundproofing window inserts, we looked for four basic characteristics in choosing materials:

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