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Today we’re going to talk about sound absorbing materials. Sound absorbing materials are different than sound damping materials. In our last video in the series we talked about sound damping materials so today we’re going to look at the other side of the coin.

Sound absorbing materials convert sound energy into heat, that’s how absorption occurs. So when sound energy strikes a surface that’s absorptive, there’s an energy change going on. We’re not destroying the energy, we’re changing it to a new form namely heat.

Heat is part of the absorption process. There are different kinds of sound absorption technologies for different sound absorption requirements. Low-frequency requires a different type of technology than middle and high frequency absorption. Let’s use some examples.

Low-frequency absorption: Hemholtz resonators, diaphragmatic absorbers. These are specially designed sound absorbing devices that work off of sound pressure. Then we have middle and high frequency absorption. What do we have as examples in that area? We have foam, draperies, carpeting, furniture, anything that’s porous, that lets sound or lets air flow through it.

So we have all kinds of materials that we can use for sound absorption technologies, but we must match the material with the technology and what we’re trying to accomplish. So if it’s low-frequency we have a certain kind of technology we have to apply but if it’s middle and high frequency we have a certain technology that we have to apply.

Broadband absorption is an absorption product technology that works across all those three areas.

I hope this explanation helped. Please leave any comments below so I can get back to you. If you want to learn more about this subject please sign up for our free room acoustic treatment videos and ebook which provide step by step instructions. Get instant access by signing up now. And if you would like your room acoustic issues analysed for free by me then please fill in the form here and I will be happy to take a look for you.


Dennis Foley

I am an acoustic engineer with over 30 years’ experience in the business. My technology has been used in Electric Lady Land Studios, Sony Music of New York, Cello Music and Films founded by Mark Levinson, and Saltmines Studios in Mesa, Arizona, along with hundreds of others.

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