Lessons from 2020 – Acoustics and More.
Posted by Acoustics First in Articles, Uncategorized on December 23, 2020

International Year of Sound opening ceremony in Paris… Pre-COVID-19 restrictions.
On January 31, 2020, the International Year of Sound held its opening ceremony at Sorbonne University in Paris – where there was much optimism for the education and advancement in the understanding of sound and how it affects our daily lives. COVID-19 was just starting to enter into the world vocabulary, and we all met with no masks, no social distancing, and no restrictions (France had only just identified a few cases that very week.) Little did we know how the year would eventually evolve. Lock downs, Zoom meetings, working-from-home, and the virtualization of our interactions brought to light some issues that many of us had taken for granted.
Our personal spaces have become full of sound, with adults working and doing virtual meetings, while the children are taking classes from home. The dogs are barking, the toddlers are toddling, the neighbors are jamming, and we are all becoming keenly aware of our acoustic environments. This is a situation that we didn’t know we were going to be facing at that opening ceremony in Paris. Some people never considered having to work from home, much less having a home office and having to work from home daily. Even if you had a home office, did you really consider what it looked like… or sounded like?

Adding Sonora® Panels improves acoustics and creates an interesting backdrop for those Zoom meetings.
This melding of personal space and workspace has created some conflicts. When you want a quiet space to work, you may be competing with your child’s virtual gym class in the other room, or your neighbor upstairs trying their best to stay active while the lock down has closed the gym – but these aren’t the only issues. Maybe earbuds hurt your ears, or you are using the microphone on your webcam and people keep complaining about how it’s hard to understand you. Speech intelligibility declines in poor acoustic environments and the acoustics of your home office may now have become an issue to others… not just if you understand them – but if they can understand you.

Adding diffusers to make it sound more like a home theater.
And it’s not just work and school… we are spending much more time in our homes this year. People are realizing that their TV’s are becoming home theaters, and the room maybe doesn’t sound that good. We are asking more of our home environments – we are asking them to be our offices, gyms, theaters, workshops, studios, as well as where we eat and sleep. Many are making improvements to their homes to block sounds from their offices, improve the sound within the home office, make a better sounding TV room, and acoustically treating the kids’ rooms – to hopefully improve sanity for everyone.
However, not everything is so easily solved. If you are in a multi-family dwelling, your neighbors may have different schedules than you. They may be night-shift tech-support, or sales for a different time-zone, or work for an international company. Maybe their home office is directly adjacent to your bedroom, or your home theater is causing them problems. Some have learned to adapt with sound masking solutions, acoustic treatments, or improvising their own home-grown solutions to address sound problems.
So, 2020 has not been the year we thought it would be in January. We have had to learn to compromise in the face of adversity to improve this situation for everyone – and it’s more than just making our home sound better for work or leisure. This goes beyond our own walls, and our own ears. Improving acoustics helps our neighbors work and their children learn. We are helping our co-workers and our customers. We are making the best of a difficult situation – while looking to the future with hope and optimism.
Here we sit at the end of 2020… and the International Year of Sound has been extended into 2021. We have learned many lessons, and have had to solve problems we never thought we would have to face. The world sounds very different now – we have found new ways to experience entertainment, new ways to work, new ways to play, and new ways to socialize.
Moving forward, we will need to integrate these solutions into our future reality. The Year of Sound has taught us lessons through adversity that we would have never learned otherwise – and those lessons of hope, optimism, tolerance, ingenuity, and compromise will serve us well as we face whatever the future holds.
ASA 2020 – Acoustics Virtually Everywhere
Posted by Acoustics First in Press Release, Uncategorized on December 4, 2020
December 7-11, 2020: The Acoustical Society of America (ASA) is running their first fully-virtual meeting, Acoustics Virtually Everywhere (AVE). The format is just like a real-life convention with a few interesting twists. If you’ve ever had a scheduling conflict and needed to choose one presentation over another – you don’t necessarily have to! Many of the sessions are prerecorded, so you can watch the presentations when you have time, and if you have questions you can reach out before, during, or after their allotted time!
There will be poster sessions where you can meet the presenters, and there are chat and social platforms for networking as well! Jim DeGrandis from Acoustics First® will be in attendance.
So… if you are an ASA member and were wondering about how this virtual meeting is going to work… check out the “Acoustics Virtually Everywhere” overview here
https://acousticalsociety.org/overview-ave/
If you aren’t an ASA member, you can find out more about the benefits of becoming a member here.
https://acousticalsociety.org/asa-membership/
We look forward to seeing you there… Virtually.
ArtDiffusor® Model D vs. Aeolian®: Similar, yet different.
Posted by Acoustics First in Diffusion, Product Applications, Products, Uncategorized on November 12, 2020
Today on, “Similar, yet different…” we are going to analyze two more of our acoustic diffusers and compare/contrast their designs and functionality… and this one is a doozy; The Model D vs. The Aeolian®. These two diffusers have some very interesting similarities and some surprising differences – so lets get started!
We have discussed the Aeolian® construction before, so we will start here with a quick recap as a reference point. The Aeolian® started life as a blocky-looking diffuser – just like the Model C, but the implementation is different. While the Model C retains its “blocky” appearance, the Aeolian® has run through a mathematical process called “bicubic interpolation.” This smooths the transition from one block to the next, creating the wavy appearance of the Aeolian® diffuser.
So, keep that in mind: The diffuser was tuned with different height blocks and then the transitions were smoothed.

Look at the smooth curves of the Aeolian®.
The Art Diffusor® Model D has multiple layers of math below its curved surface. While the Aeolian® started life as “Blocks” of different heights… the Model D started life as “Rings” of different sizes and heights. The calculation for the heights is identical to the mathematics used in tuning the Aeolian®, but why different sized rings?
There is an older diffuser design known as a Maximum Length Sequence (MLS) diffuser. These were tuned to different frequencies using a specific depth, and different spacings of “lands and valleys.”
The Model D started with the concept of twisting the MLS spacings into rings, and changing the size of the rings. Then to break the “MLS mold” of having the same depth, this MLS ring structure is raised to different heights using Quadratic Residue calculations… effectively combining the rings of MLS spacings with different QRD heights. While this could have been where this stopped, we wanted to interject more randomness into the equation.
Wherever the rings of different heights intersected, we decided to change the heights by values relative to the difference between the two rings. This height variation is what is responsible for the “random” waviness. This was accomplished with different Boolean Functions, to either add or subtract height where the rings intersected.

You can really see the variation in the geometry of the Model D… look at the ripples in the rings.
This method of using Boolean Functions inserts a known-height randomization into a hybrid MLS/Quadratic system. (That’s a mouthful.) The final step, after refining the ring size, height, position and intersection parameters… was to smooth the whole geometry with “Bicubic Interpolation.” That’s right. This final step smooths all the transitions from the heights, just like the blocks of the Aeolian®.
So onto the Simple Similarities!
Both diffusers use a quadratic residue calculations to get the main heights of the diffusive elements. Both diffusers are finished off with a helping of “Bicubic Interpolation” to smooth it all out. This gives them both a very organic look… The Aeolian® looks a bit like rolling waves, and the Model D resembles droplets of rain in a puddle…
They do perform quite a bit differently though.
The Aeolian® has great lower mid-band performance… while the Model D is a beast in the upper mid-bands starting about 2.5K. The difference is in the severity of the geometry. The Aeolian® is a gently rolling surface which redirects the waveforms uniformly through a wide range of frequencies. The Model D has a very irregular surface. With the different ring sizes, heights, locations and boolean functions… it’s meant to target and shred mid to high frequencies. Both diffusers are asymmetric – and affect different frequencies in different ways.
The Aeolian® is also deeper than the Model D – and this depth is a single resonant cavity… allowing it to be a great bass absorber as well. The Model D is useful in environments where you have bass control in place, but really need to diffuse the upper mid range and bring those frequencies to life… or maybe shred some flutter echos or comb filtering. There are scenarios where both are used in the same environment – but for different reasons.
In Conclusion...
While both the ArtDiffusor® Model D and the Aeolian® both look like liquids frozen in time, they have some other similarities in the math behind them… Yet they are still as different as rolling waves versus droplets of rain in a puddle.
Church Acoustics: Past, Present, and Future Challenges (Article)
Posted by Acoustics First in Absorption, Articles, Broadcast Facilities, HOW TO, Product Applications, Products, Sound proofing, Worship Facilities on October 28, 2020
With all of the challenges of 2020, Technologies for Worship Magazine wanted to discuss the issue of acoustics in the current state of things. They approached Acoustics First® for help. While focusing on streaming, the article also covers other emerging issues and future challenges as we all move forward.

Streaming services from empty halls is an often overlooked situation. (Sonora® Panel installation at Midway Christian Church – Photo by Bo Vandall, Sound Solutions – Beckley, WV)
Technologies for Worship article below.
Link to Acoustics First® Article
(TFWM site here)
To overcome your present and future acoustic challenges, contact Acoustics First® for help!
Unity Spiritual Center of Woodstock – Acoustic Update
Posted by Acoustics First in Absorption, Customer Feedback, Product Applications, Products, Worship Facilities on October 8, 2020
When the Unity Spiritual Center of Woodstock wanted to use their sanctuary for more varied community events, it became apparent that they needed to address the acoustics of the space to meet the demands of those functions.
Acoustician Cameron Girard ran reverb calculations and provided a comprehensive treatment proposal utilizing Sonora wall panels. Sonora panels are a great solution for worship and performance spaces, offering excellent broadband sound absorption in an attractive, customizable finish. In addition to controlling the specular wall-to-wall reflections (echoes) which degrade speech and music, the recommended treatment aimed to reduce excessive reverberation by approx. 50%, significantly improving intelligibility. Cameron’s clear panel layout facilitated a simple installation that was performed by handy volunteers from USGW’s congregation.
Sonora Panels tamed reflections from the back wall and lowered the overall intensity. This increased clarity while keeping the ambiance that the congregants enjoyed. Acoustic changes that tame a space don’t need to destroy its acoustic character… they can be focused to manage some of the elements that produce unwanted artifacts.

Sonora Panels help to tame the harsh reflections coming from the back wall, corner, and angled fascia.
The front of the room received some more Sonora Panels, but reinforcing surfaces from the ceiling were left reflective to allow any unamplified voices from the stage to carry into the audience.

Notice how the Sonora panels are used to control the reflections on the back and sides of the stage, but the ceiling is left mostly reflective.
Now a full year removed from this project, How did it turn out?
”The sanctuary at the Unity Spiritual Center of Woodstock turned out beautifully both visually and acoustically. The folks at USCW are very pleased and the old sanctuary now has new life with more activities and recognition from the community as a great new venue for many things both church and community based including concerts and stage productions.” – George Muligano USCW
Another Happy Client!
Reach out to Acoustics First for a treatment recommendation for your performance space or worship facility!



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