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Alex D.

Reverberation Rooms

News out of England that recently caught our attention: Meta has opened a $16 million lab to conduct audio research and development for the company's AI glasses and other AI equipment. In addition to anechoic and semi-anechoic chambers, the lab also features what it is calling "one of the world’s largest configurable reverberation rooms," equipped with "101 individually adjustable acoustic panels" to simulate different environments ranging in size.

Whereas anechoic chambers completely absorb sound (to the point that people have reported feeling disoriented after standing in one for a prolonged period of time), reverberation rooms are designed to create reverberation and send sound energy around the space. In fact, when an acoustics company like Audimute wants to calculate the noise reduction coefficient, or NRC, of its acoustic panels, it sends them to laboratories that test the acoustic products in such reverberation rooms. NRC ratings range from 0.0 (no absorption) to 1.00 (total absorption), with Audimute's panels boasting NRC ratings as high as 0.95.

We're excited to learn more about the role that acoustics will play in, as Meta says, "developing intelligent audio that adapts to users and their surroundings." And, hey, Meta - if you ever want to build a reverberation room stateside, feel free to reach out to our Acoustic Specialists for a consultation!

Soundproofing or Sound Absorption?

Many times at Audimute, we'll hear from folks who need help with "soundproofing." Their office is too echo-y, there's some high-frequency sound in their restaurant, they want to be able to hear their drums, etc. All completely valid acoustic concerns; except the solution they're looking for isn't soundproofing; it's sound-absorbing. 
 
At Audimute, we do both (more on that later). But let's delve into what those terms really mean. 
 
Soundproofing has become the easy, shorthand term for any kind of sound management solution, but it really only speaks to a specific kind: the total containment of a room or space so that no sound is getting in or out. 100% soundproofing is possible, but it can result in an acoustic environment so tightly regimented that it ceases to be comfortable (check out anechoic chambers for more).  
 
Maybe you don't want 100% soundproofing, but you do want to block some sound from getting into or out of a space. There are plenty of scenarios where where that's the case: 

  • You live in a house next to noisy train tracks
  • You own a loud rock venue and don't want your sound to bleed into the quiet coffeeshop next door 
  • You live in a house next to noisy train tracks and a loud rock club 
  • You own a loud rock club located inside a house next to a quiet coffeeshop by train tracks

...You get the idea. 
 
Soundproofing – in the truest sense - requires new construction: tearing up a wall, adding a false floor, etc. It requires a significant amount of time, money, and labor. In short, it can be done, but it calls for a lot of commitment.
 
Sound absorption, on the other hand, is the use of mounted products such as acoustic panels to absorb echoes, reverberations, and mid to high frequencies within a room (We often tell people to think of sound waves as water and a sound-absorbing acoustic panel as a giant sponge soaking up those sound waves). There's installation involved with sound-absorbing panels, but likely no construction. 
 
Let's futher explore the difference between soundproofing and sound absorption with some real-world scenarios featuring our friend, Audie: 
 
Audie wants to drum loudly in his home studio but he doesn't want to disturb his neighbors. 
Audie needs a soundproofing solution. (Like our Peacemaker® Sound Barrier – 3mm). 
 
Audie is drumming but his drums sound muddy due to echoes in his home studio. 
Audie needs a sound-absorbing solution. (Like our Sound Absorption Sheets). 
 
Here's another one: 
 
Audie's clients at work have a hard time hearing him during conference calls due to reverberations in his meeting room. 
Audie needs a sound-absorbing solution. (Like our Fabric Acoustic Panels). 
 
Audie's desk at work is constantly rumbling and shaking due to vibrations from the parking garage downstairs. 
Audie needs a soundproofing solution. (Like our Peacemaker® Soundproofing Underlayment – 6mm). 
 
One last one: 
 
Audie wants to drum loudly in his home studio but he doesn't want to disturb his neighbors AND he wants his drums to sound less echo-y in his home studio. 
Audie needs a sound-absorbing AND soundproofing solution (Like our 2-in-1 isolé® Sound Barrier Sheets). 
 
In summation, when it comes to soundproofing vs. sound absorption, here's a nifty little rhyme to help you remember the difference: 
 
If loud noise is coming through the walls, floor, or roofing 
Then the solution you want is soundproofing
But if echoes create distraction and distortion, 
Then the solution you want is sound absorption
 
Ready to discover your sound-absorbing or soundproofing solution? Contact our Acoustic Specialists for a free acoustic consultation

Emile Berliner

While we celebrate 20 years of acoustic solutions at Audimute, we also want to celebrate the legacy of those who came before us. Today, we're highlighting the contributions of Emile Berliner.


Today, Berliner is best remembered as the inventor of the gramophone and for his groundbreaking work in helicopters and rotary engines. But he also had a lifelong interest in acoustics, which prompted him to develop the Berliner acoustic tile in the 1920s (below).

 


As one newspaper explained it at the time, Berliner's acoustic solution called for a room with poor acoustics to be "covered with hollow paper discs covered with thin wires to hold their shape. These are what Dr. Berliner calls 'sound sponges,' the principle being to absorb sound waves, preventing reflection." These discs were then concealed by a layer of specially made porous cement.


Berliner unveiled his concept for the first time at a meeting of the American Institute of Architects on October 8, 1925. Soon after, in February 1926, he received U.S. Patent No. 1573475 for his acoustic tile concept:


After another year of testing, Berliner gave the first public demonstration of his 'sound sponges' in February 1927 at the James F. Oyster School in Washington, D.C., during a lecture in the institution's 3,700-square-foot assembly hall by Lieutenant Benjamin H. Rigg, a member of the 1925 MacMillan Arctic Expedition. The results were immediately apparent: Lt. Rigg could be heard clearly, without echoes or reverberations distorting his speech. 


Word spread quickly. Soon after, Berliner installed his "Resonant Walls" at Drexel University, the New York Cotton Exchange, and even the board room of a financial institution in India.

 

 


Sadly, just as his work in acoustics was starting to find an audience, Berliner passed away in 1929 at age 78. It's unclear if "Berliner's Resonant Walls" continued to be installed after his death. 


(Images courtesy of Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division & the United States Patent and Trademark Office)

Finding Reflection Points in a Home Theater

Home Theater Acoustics

Are you ready to improve the acoustics of your home theater? We receive countless inquiries about home theater treatment each day, and the most commonly asked question is where acoustic panels should be applied to most effectively improve the sound quality in the theater. Today, I am going to take you step-by-step on finding reflection points and how you can use this as a guide for perfect panel placement.

First, we need to discuss what reflection points are. The primary reflection points are the points throughout your theater at which sound is initially reflecting. In other words, it’s the first surface that sound comes in contact with after leaving your speakers. Primary reflection points are important to find as these are the most effective treatment points throughout your home theater.

 

 

 

Home Theater Reflection Points

Now picture this: you just finished your home theater set up! You spent hours shopping for the right speakers, the most comfortable couch, and the best screen or projector. You throw in your favorite movie and notice something: you forgot to take the room acoustics into consideration! Fear not! That echo you’re noticing can be treated by adding acoustic panels to your theater!

To find the reflection points, you will need the following:

      • A home theater

      • A handheld mirror

      • Sticky notes

      • A patient friend


1. First, set up the room as if it were finished. Speakers and seating in your space should be placed in their final

home Theaterslocations. Moving any of these elements will change the primary reflection points of sound throughout your space.

I recommend leaving the walls mostly bare (aside from any speakers). This will make the process of marking and finding reflection points much easier.

Once the walls are bare and the speakers are in their final position, it’s time to start listening. Carefully examine where the sound is coming from in the theater.

2. Second, have your friend hold the handheld mirror parallel to the wall surface. Face the screen in your theater, and move the mirror around the walls until you can see any speakers reflected in the mirror. Be sure not to move your head or tilt the mirror throughout this process, as this will alter the reflection points. Mark these points with a sticky note. These are the primary reflection points.

Reflection Points

Each speaker in your space should have 6 reflection points (one on each of 4 walls, one on the ceiling, and one on the floor). For a 5-speaker system, there should be 30 reflection points. Some of these points may not be treatable. This would include points that are blocked by open hallways, furniture, or other objects. This is not an issue. While treating primary reflection points is important, treating every reflection point is not necessary to improve the sound quality in your theater.

3. Once you have the reflection points marked, you can begin adding absorption.                 

For reflection points on the floor, consider adding a rug. If the theater is carpeted, treating the floor should not be necessary. For any windows, consider adding curtains or drapes.

To treat any reflection points on the ceiling, consider flush-mounting Acoustic Tiles to the ceiling surface, or suspending Acoustic Clouds from the ceiling.

Acoustic Panels in Home Theater

            Ceiling Acoustics                                                  

4. Finally, for the reflection points on the walls, consider adding Acoustic Panels. With a variety of sizes, colors, and styles to choose from, Audimute Acoustic Panels are an excellent option to consider for any home theater application.

For more advice on creating the perfect home theater, please don’t hesitate to contact one of our Acoustic Specialists!

How and When To Use isolé®

You know you have a sound issue. However, you're not sure if you need to block or absorb the sound. Sound absorption and sound blocking are two very different principles. Using sound absorption in a space will help to improve the sound quality by limiting sound reflections, reducing echo and reverberation. Sound blocking, on the other hand, will help to ensure that sound is not traveling through any shared walls, floors, or ceilings. Most acoustic problems can be treated by utilizing either sound absorption or sound blocking. But what do you do if you need both? That’s where isolé® comes in.

Originally designed to block sound traveling through shared hotel room doors for The Ritz-Carlton, isolé is a two-in-one sound solution, providing elements of both sound absorption and sound blocking. Each isolé consists of a layer of our eco-C-tex sound absorption material, along with a layer of our Peacemaker® Sound Barrier, which is a recycled tire rubber barrier designed to block sound transmission. Isolé’s 36” x 82” size should be perfect for most door applications.

Although isolé was designed specifically for doors, its applications go far beyond just door treatment. Isolé can be a perfect option for window treatment. The layer of Peacemaker included in the isolé will help to provide mass and density to a window. Three metal grommets make installing isolé over a window a snap!


Isolé can also be an effective solution for rehearsal spaces. Using isolé on any shared walls will help to reduce the amount of sound exiting your space, while also improving the sound quality inside your rehearsal space.

If you have any questions about isolé or treating your space, please feel free to fill out an online analysis form, or contact any of our Acoustic Specialists!