Noise Reduction

Understanding the basics of noise reduction


A well-balanced room with a perfect acoustic level is a key factor to the performance and well-being of workers all over the world.

If you would like to treat sound within a room, you should start by understanding the basic terminology of acoustics. And, like a lot of things, better acoustic performance begins with solid fundamentals.

What you’ll learn in this guide:

  1. Definition of sound: Frequency, Decibels & Reverberation time
  2. Building acoustics vs. Room acoustics
  3. Principles for good acoustics: Absorption, Attenuation & Diffusion

1. Definition of sound

Sound consists of pressure waves running through the air. It can be described as energy, created by vibrations, transmitted through air or any other medium. The inner ear converts those vibrations into electric signals, which are sent to our brain, where they will be processed and perceived as the actual sound coming in.

These sound waves have two different characteristics:

  • Frequency determines the tone of the sound
  • Decibel determines the intensity of sound

— Frequency: how sound waves travel

The wavelength determines the sound frequency. It is measured as the number of repetitive vibrations per cycle per second and is expressed in Hertz.

The audible range of sound is between 20 to 20 000 Hz. The higher the frequency, the higher the tone. However, for space planning, the suggested frequency ranges from 100 Hz to 5000.

High tones

High frequency | Short wave | 2500 - 12000 Hz | e.g. ringtones, consonants

Mid tones

Speech frequency | Mid length wave | 250 - 2500 Hz | e.g. speech

Low tones

Low frequency | Long wave | 50 - 250 Hz | e.g. HVAC, vowels

— Decibel: the intensity of sound

Decibel is a logarithmic unit to express the ratio of sound intensity (volume) and is important as an indicator of the background noise level. Humans can hear sounds between 0 and 140 decibels. The value of decibels has no direct or indirect correlation with the sound frequency.

For example, the ticking of a clock and the buzzing of a vacuum cleaner may have the same frequency but a different volume.

Why it matters? In today’s open-plan workspaces, employees are exposed to noise pollution. The level of noise ranges from 60 to 80 decibels, whereas recommended background noise level in an office is around 45 dB.

Noisy offices above the suggested threshold may hamper:

  • concentration & productivity
  • Speech privacy
  • Overall acoustic comfort & wellbeing

But there is always a way to avoid getting stressed by trying to keep focus at work. The solution could be several workplace microenvironments, designed with sound balance in mind for the activity and the people using these areas.

— Reverberation time: the time for a sound to drop dead

Reverberation time is the time needed for an original sound source to decay by 60 dB and is expressed in seconds. In order to generate excellent speech intelligibility and clarity, the reverberation time should be adjusted and balanced by means of absorptive material in function of the specific acoustical issues in a given space. The reverberation time will always be influenced by

  • the volume of the room,
  • room temperature, and
  • existing absorptive materials in the room, e.g. materials, objects, and people.

Recommended reverberation time for different spaces (measured in seconds):

  • Office: 0.7 – 0.9s
  • Meeting room: 0.4 – 0.8s
  • Cafeteria: 1.00s
  • Gymnasium: 1.50s
  • Auditorium: 1.50 to 2.00s

Try measuring the reverb time in your space with the BuzziSpace RT60 app. It allows you to simulate the improvement in room acoustics by adding sound-absorbing products. Download the app in the App Store, available for both iPhone and iPad.

Why it matters? In an office, high reverberation levels intensify noise levels and reduce speech clarity, as the sound reflects from walls and tables, among other hard surfaces.

The way to dampen reverberation is with absorption materials.

2. Building acoustics vs. Room acoustics

— Building acoustics

Building acoustics and room acoustics may sound like two sides of the same coin, but don’t be fooled. We have to make a clear distinction, as the solutions to treating problems associated with either of the two are very different. As the name implies, building acoustics has to do with the building and the transmission of sound from outdoor to indoor and between structural elements of a building, e.g. floors and walls.

This is the case when:

  • Sound is transferred from outdoor to indoor, e.g. cars, trams, airplanes passing by
  • Sound is transferred between floors, e.g. footsteps from the floors above
  • Sound is transferred between adjacent rooms, e.g. an adjacent meeting room

Ideally, issues like these should be addressed by the architectural team through the insulation of windows, walls, ceilings, and floors. Another option is to remedy the transmission of sounds, so they will not escape the room, to begin with.

— Room acoustics

Room acoustics, pertain to noise and sounds within a room or any given space. Rather than focusing on insulation to remedying transmission of sounds, the key to room acoustics is absorption to prevent sound waves from bouncing back-and-forth in a room.

3. Principles for good acoustics

To create a better acoustical environment and reduce reverberation time in a room, BuzziSpace acoustic solutions are developed to perform on one or more of the following acoustic principles.

— Absorption

Sound Waves are absorbed by any acoustically soft material they encounter.

Sound is energy, and in order to stop this energy from propagating, absorptive panels must be used to convert this energy into heat through friction. The absorption coefficient of a product will determine the level and quality of absorption. Absorption solutions can be applied to fixed wall or ceiling elements, e.g. BuzziBlox, BuzziLand, BuzziPod.

— Attenuation

Reducing the sound transfer within a room.

In order to reduce the sound transfer between different spaces, vertical elements will be applied to cut down sound energy, either pending from the suspended from the, ceiling, free-standing or desk-based. Those can come in different shapes such as vertical ceiling panels, room dividers, desk screens along with a range of acoustic essentials. Never underestimate how attenuation or sound dampening has a positive impact on speech intelligibility and clarity. It’s no wonder that a positive acoustic experience that absorbs disturbing sounds leads to a quieter space, fosters focus and inspires effective collaboration within an energetic workspace.

— Diffusion

Sound energy is spread evenly in a given space.

Wavelengths, which can’t be absorbed through acoustic treatment, will dissipate evenly back into the room, ensuring a better spread while maintaining a live, vivid sound. Otherwise, the sound will be reflected back in a linear way, resulting in a remaining unpleasant sound. This property can be obtained by alternating different depths of absorptive material and 3D shapes such as BuzziTile 3D and BuzziBrickBack. Check out other solutions.

Need acoustic advice?

Contact our experts to find the solutions that best remedy your noise issues.
Let's talk!

Related articles


Mushroom Power: The Magic Behind BuzziSpace’s Mycelium Acoustic Panels

Designed with a commitment to sustainability, BuzziSpace's mycelium-based acoustic panels are 100% grown and crafted from local organic waste materials in Europe, serving as a fully biodegradable alternative to other acoustic panels in the company’s award-winning catalog.

Read more


BuzziHug Work Wins 2024 HiP Award

Our coziest workstation has been selected as the 2024 HiP Awards Winner in the Workplace: Furniture category! 

Read more


Nature’s Inspiration: Inside the World of BuzziShroom

With an eye for detail and a passion for pushing boundaries, Cory Grosser unveils the inspiration, challenges, and triumphs that flourished in the creation of BuzziShroom.

Read more


Creating Cozy Environments, Stitch by Stitch: Maison Tricot x BuzziSpace

Read the full background story on our exclusive collaboration with knitwear and design experts, Maison Tricot.

Read more


NeoCon 2024 Highlights

See what happened during the three-day event.

Read more


BuzziPebl Light Nominated for Mix Interiors Awards 2024

Winners will be announced on June 27th!

Read more

Idea Starters

How to Design for Well-Being

We share our ABCs for optimizing acoustics in hybrid spaces.

Read more


Milan Design Week 2024

Join us in the heart of Poltrona Frau's flagship.

Read more

Idea Starters

New Product: BuzziReDesk

Introducing BuzziReDesk – Redefining Your Workspace With Sustainable Style

Read more

Idea Starters

Your MeSpace in Less Than 15 mins

Our new pre-assembled BuzziNest Booth option makes it easier and quicker for you to enjoy some privacy.

Read more


Introducing BuzziReFamily: BuzziSpace’s Newest Sustainable and Eco-Conscious Solutions

We are proud to announce the launch of a revolutionary line of sustainable, reengineered, and repurposed solutions, setting a new standard for eco-conscious living and workspaces.

Read more


BuzziAcademy: Well-Being by Design: Optimizing Acoustics in Hybrid Spaces

Thanks for joining us. Stay tuned for the next installment.

Read more

Idea Starters

Embracing the Future: Workspace Trends to Watch in 2024

Here's a glimpse into what the professional landscape might look like for the upcoming year.

Read more


Coca-Cola Refreshes Its Bulgarian Office

Who says acoustic solutions can’t be tasty?

Read more


Karl Kübel Schule Elevates Its Learning Spaces

On top of fighting poor acoustics, our solutions helped to create collaborative spaces for the technical school.

Read more
Contact us