One of the biggest sticking points newbies have when first getting started with home recording is…. Which is why in this post, I will walk you step by step through the entire process of designing an effective acoustic treatment setup for your home studio. Have you ever gotten to visit a grand cathedral like the one in this picture? But with acoustic absorption , all that remains is the direct sound from the instrument to the microphone…which is exactly what we want. Diffusors work by scattering reflections so nothing gets trapped, and the natural tone is preserved.

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Below are a few definitions of some acoustical terms that you might run into on this site. In addition to the definitions provided, here is an additional source recommended for further study of acoustical term definitions:. NRC is a single-number rating representing an overview of how much sound is absorbed by a material. Soft materials like acoustic foam, fiberglass, fabric, carpeting, etc. In general, the higher the number, the better the absorption.

NRC is useful for a general comparison of materials. However, for materials with very similar NRCs, it is more important to compare absorption coefficients. Absorption Coefficient a. Comparing the absorption of materials should involve a comparison of their respective absorption coefficients in the different bands.

Provided the materials are tested in a similar fashion, the material with a higher absorption coefficient in a particular band will absorb more sound in that band when you use it in your room.

Be careful though: Materials are tested using different mounting methods. Also, there are three main standard methods used to test materials for absorption. These two methods are quite similar, but the ISO method — in general — will produce slightly lower overall numbers than the ASTM method. This method places a small sample of the material under test at the end of a tube and measures the absorption.

Again, the numbers from this test are usually lower since a different method of calculation is used. They are also not as representative of real-world applications of materials relative to the reverberation chamber methods.

Hard materials like rubberized sound barriers, concrete, brick and drywall will have high STCs. Softer materials like mineral fiber, acoustic foam and carpet will have much lower STCs. Virtually every material filters out some of the sound that travels through it, but dense materials are much better at this than are porous or fibrous materials.

However, to truly compare performance, the transmission loss numbers should be reviewed. This is the concept of detaching partitions from each other, or physically detaching layers in a partition in order to improve sound isolation. Room Modes. Normally, this is a small room phenomenon, though large rooms have very, very low modes as well. There are three types of room modes:.

Decoupling This is the concept of detaching partitions from each other, or physically detaching layers in a partition in order to improve sound isolation.

The most common methods of decoupling are: Air gaps or air spaces between two partitions. Room Modes A room mode is a low frequency standing wave in a room. There are three types of room modes: Axial modes: Standing waves between two parallel surfaces. Tangential modes: Standing waves between four surfaces.

Oblique modes: Standing waves between six surfaces. Oblique modes are more complex, higher in frequency and decay faster. Therefore, they are not typically a big problem. For a complete treatment of modes, there are ample discussions in acoustic reference books.

There is also software that can do the same. Home Categories My Account Contact support auralex. Forgot your password? Create Account.


CHAPTER 3: The Ultimate Guide to Acoustic Treatment for Home Studios

Sound Isolation — What is it? Many times it is used in a general sense to mean any kind of acoustic treatment. This material helps absorb sound waves and prevents them from causing slap back echo and reverb in a small room. Isolation products stop the transfer of sound from one room to another by adding mass, different layers with different densities achieving the highest results. Unfortunately, currently, this is the only way to properly isolate a room. All materials that are intended to block sound have an STC Rating.


Basics of Acoustics

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