How do you reduce noise using sound-absorbing bulletin boards?

A sound-absorbing bulletin board is ideal when a wall surface needs to be both practical and acoustically effective. It serves as a pinboard for messages, planning, and inspiration, while the absorbent material reduces some of the sound reflections that would otherwise bounce off the wall.

This solution is particularly useful in offices, classrooms, staff rooms, libraries, home offices, and common areas. These spaces often require both an information display surface and contain many hard materials that can contribute to echoes and prolonged reverberation. By replacing a standard thin bulletin board with a sound-absorbing model, the same wall section can serve two distinct functions.

A bulletin board is primarily a localized wall treatment. It can soften the sound environment near a workspace or conversation area, but the amount of absorption must be proportional to the room’s size and acoustic issues. In a large room with a lot of glass, high ceilings, or multiple hard walls, a single bulletin board may need to be supplemented with additional sound absorbers.

SilentDirect’s recommended priority for general sound absorption is to start with the ceiling whenever possible. The ceiling often provides a large, unobstructed absorption surface. A sound-absorbing bulletin board then serves as a functional complement on the wall, especially where information needs to be posted anyway or where wall reflections near people need to be dampened.

It is also important to distinguish between sound absorption and sound insulation. The bulletin board reduces echoes and reflected sound within the room. It does not prevent sound from traveling through the wall into an adjacent room. For such problems, the wall structure itself must be sound-insulated.

Benefits and Function—How a Sound-Absorbing Bulletin Board Works

A sound-absorbing bulletin board combines a practical information display with sound-absorbing properties. It can be used for announcements, scheduling, and visual materials while helping to reduce sound reflections, echoes, and reverberation in the room. This makes it particularly useful in environments where functionality, aesthetics, and a more pleasant acoustic environment need to be combined.

Two functions on the same wall surface

The bulletin board provides a practical, pin-friendly surface for information, notes, planning, and visual materials. At the same time, the material absorbs some of the sound energy that would otherwise be reflected back into the room. A single wall surface thus serves both a practical and an acoustic function.

Reduces echo and reverberation

In rooms with many hard surfaces, sound can bounce between walls, floors, ceilings, windows, and furniture. This can create disruptive echoes, long reverberation, and a harsh soundscape. The bulletin board’s absorbent material absorbs some of these sound reflections and contributes to softer and more controlled room acoustics.

Softer sound reflections from the wall

When the bulletin board is placed on a hard, reflective wall surface, it can reduce distinct sound reflections near workspaces, conversation areas, and common spaces. Placement is therefore important and should be tailored to where people work, talk, and spend the most time.

Can lower the perceived noise level

A sound-absorbing bulletin board does not eliminate the sound source itself, but it can help make the room feel quieter by reducing the amount of sound that continues to be reflected. The effect is usually more noticeable when a larger portion of the room’s hard surfaces is covered with absorbent material.

Improves concentration and work performance

When echoes, reverberation, and distracting sound reflections are reduced, it can be easier to concentrate on work tasks. A quieter acoustic environment can contribute to better focus, increased efficiency, and improved work performance, especially in offices, schools, and other environments where many people are present at the same time.

Creates a better work environment

A well-balanced acoustic environment can make a room more pleasant to be in. Reduced sound reflections can help reduce noise fatigue, lower stress levels, and improve the well-being of people who work or spend extended periods of time in the space.

Improves meetings and conversations

In meeting rooms and other environments where clear communication is important, sound-absorbing materials can improve speech intelligibility. As reverberation decreases, voices become clearer, and it becomes easier to follow conversations, presentations, and discussions without the sound blending together.

A practical and accessible information surface

The bulletin board can be used to display messages, schedules, plans, photographs, teaching materials, and other important information. Since the surface already serves a clear purpose in daily life, the acoustic improvement can be integrated without taking up a separate or unused portion of the wall.

Suitable for a wide range of environments

Sound-absorbing bulletin boards can be used in places such as:

• Offices and workspaces
• Meeting rooms and conference rooms
• Schools and preschools
• Libraries and study areas
• Restaurants and common areas
• Studios and creative workspaces
• Home offices and other home environments

Aesthetic Integration into the Room

Sound-absorbing bulletin boards are often available in a variety of colors, shapes, and sizes. This makes it possible to match them to the room’s other furnishings and create a cohesive and aesthetically pleasing wall solution. Multiple bulletin boards can also be combined to create patterns, color blocks, or larger contiguous surfaces.

Flexible placement and easy installation

Many sound-absorbing bulletin boards are easy to install and can be moved or supplemented with additional units as needed. Their placement can be adjusted based on where information needs to be visible and where the most disruptive sound reflections occur. This provides a flexible solution when the space is rearranged or repurposed.

A cost-effective way to improve acoustics

A sound-absorbing bulletin board can improve a room’s acoustics without requiring extensive structural changes. Since the product combines a practical bulletin board with an absorbent surface, it can be a cost-effective alternative for spaces where both a display area and improved room acoustics are needed.

Can be part of a larger acoustic solution

A bulletin board typically covers only a limited portion of the wall and therefore works best as part of a well-thought-out overall design. If the room has significant acoustic issues, the bulletin board can be combined with ceiling absorbers, standard wall absorbers, desk screens, curtains, and other sound-absorbing surfaces.

The extent of the improvement depends, among other things, on the bulletin board’s size, material, thickness, and placement, as well as the room’s volume and other surfaces. The larger the absorptive surface used, the better the conditions are typically for reducing reverberation.

Improves room acoustics—not sound insulation between rooms

A sound-absorbing bulletin board primarily improves the acoustics in the room where it is installed. It absorbs sound reflections and can reduce echoes and reverberation, but should not be confused with sound insulation.

To prevent sound from being transmitted through a wall to an adjacent room, a dense and sufficiently heavy construction is usually required. The bulletin board therefore functions as a sound absorber within the room, not as a substitute for a sound-insulated wall.

How does a sound-dampening and sound-absorbing bulletin board work?

A sound-dampening and sound-absorbing bulletin board is an innovative solution that combines practical functionality with acoustic improvement. These bulletin boards are used in environments where both information sharing and sound control are important, such as open-plan offices, schools, conference rooms, and other noisy spaces. By combining sound-absorbing materials with a surface that can be used to attach notes, pictures, or messages, these boards contribute to a more pleasant acoustic environment while serving a practical purpose. They help reduce reverberation, minimize distracting background noise, and create a more focused atmosphere.

Materials and Construction
Sound-absorbing bulletin boards are constructed using specialized materials that effectively capture and dampen sound waves. The most common materials include acoustic foam, polyester fiber, wool, and fabric-covered panels. These materials have a porous structure that allows sound waves to penetrate the surface and be absorbed rather than reflected back into the room. The choice of material is crucial to how effective a bulletin board is in terms of sound absorption. Polyester-based bulletin boards are popular because they offer both high sound absorption and durability. Acoustic foam is another effective option that has a high absorption capacity, especially for high-frequency sounds. In addition to the material, sound absorption is influenced by the board’s thickness and structure. A thicker board generally provides better sound absorption, and some models feature patterns or perforations that further improve acoustics by breaking up sound waves and reducing reflections.

NRC Value—An Important Factor When Choosing a Bulletin Board
When choosing a sound-absorbing bulletin board, it’s important to consider its NRC value (Noise Reduction Coefficient). The NRC value indicates the proportion of incoming sound absorbed by the material on a scale from 0 to 1. An NRC value of 0.6 means the board absorbs 60% of the sound waves that strike it, while a board with an NRC value of 0.9 absorbs 90% of the sound. The higher the NRC value, the more effective the board is at reducing reverberation and improving the room’s acoustics. The choice of NRC value should be based on the room’s specific needs. In a noisy office environment or a school where many people are talking at the same time, a board with a high NRC value can make a significant difference.

Placement and Size for Maximum Effect
For a sound-absorbing bulletin board to be as effective as possible, its placement is crucial. Sound is reflected differently depending on the room’s shape, materials, and the location of sound sources. A general rule of thumb is to place bulletin boards on surfaces where sound is reflected the most, such as empty walls or surfaces directly opposite sound sources. If the goal is to reduce background noise in an open-plan office, it can be effective to mount bulletin boards on the walls around workstations. The size of the board also affects how much sound it can absorb. Generally, the larger the surface area covered, the more sound is absorbed. A smaller bulletin board can help reduce noise, but for optimal results, at least 20–30% of the room’s surfaces should be covered with sound-absorbing material. In larger rooms, several smaller bulletin boards can be strategically placed to distribute sound absorption evenly across the entire surface. This can be particularly effective in rooms with hard surfaces such as concrete, glass, or drywall, where sound reflections are often a problem.

Combine with other acoustic solutions
To achieve the best possible sound reduction, sound-absorbing bulletin boards can be combined with other acoustic solutions. By using sound-absorbing panels on the ceiling, carpeting on the floor, and soft furnishings, the overall acoustic environment can be significantly improved. A comprehensive solution where various sound-absorbing elements work together provides more effective and balanced acoustics. This is particularly important in open-plan offices and schools, where multiple sound sources interact and a well-thought-out strategy is required to create a quieter work environment.

Limitations and Realistic Expectations
It is important to have realistic expectations regarding what a sound-absorbing bulletin board can achieve. These products are excellent at reducing sound reflections and reverberation, but they do not eliminate sound entirely. If the room has poor sound insulation or if there are high noise levels from external sources, such as traffic noise or sound penetrating through thin walls, additional soundproofing measures may be needed. These can include better window insulation, thicker doors, or the installation of custom-designed sound barriers. A sound-absorbing bulletin board is therefore part of a comprehensive solution and should be used in conjunction with other acoustic measures to create an optimal acoustic environment.

Summary
Sound-absorbing bulletin boards are a smart and functional solution for reducing reverberation and improving acoustics in noisy environments. By combining sound-absorbing materials with a practical surface for attaching notes and messages, they serve a dual purpose in offices, schools, and conference rooms. Material selection, NRC value, placement, and size are crucial factors in determining how effectively a bulletin board absorbs sound. By strategically placing them where sound is most often reflected and combining them with other acoustic solutions, you can create a more comfortable and productive work environment. Although sound-absorbing bulletin boards do not completely eliminate sound, they play an important role in reducing distracting background noise and creating better conditions for concentration and communication.

Did you know that…

Did you know that a sound-absorbing bulletin board doesn’t just dampen sound—it can also affect the room’s acoustics depending on what you put on it? Many people think the board itself does all the work, but if you cover the surface with dense materials like laminated paper or plastic pockets, its sound-absorbing effect can be significantly reduced.

For the best sound absorption, the bulletin board should have a porous, open surface—such as felt or fabric—that allows sound to penetrate the material rather than being reflected back into the room. Additionally, a thicker bulletin board with an acoustic core can absorb a wider range of frequencies and help reduce reverberation in offices, schools, and other sound-sensitive environments. When used correctly, you can combine functionality and acoustic improvement in one!

Recommended Products

The products below can be used to combine practical information surfaces with sound absorption or to complement the bulletin board with additional acoustic measures in the room. The best solution depends on whether you want to create a pin-friendly wall surface, absorb sound from larger wall sections, or complement the space with curtains and room dividers.

Sound-Absorbing Bulletin Board – SilentDirect Bulletin is the main product when you want to combine a traditional bulletin board with effective sound absorption. The 50 mm thick polyester core absorbs sound reflections and reduces echo and reverberation, while allowing documents, pictures, schedules, and notices to be pinned directly to the board with pins or tacks.

Sound-absorbing curtain – Silent Curtain Feltra complements the bulletin board by providing a sound-absorbing textile surface in front of, for example, windows, glass partitions, and other hard surfaces. The curtain is particularly well-suited for rooms where large glass surfaces contribute to pronounced sound reflections and long reverberation.

SilentDirect PET Rectangle 100x50cm is a thin sound absorber made of recycled polyester that can be mounted on a wall or ceiling. The material’s felt-like surface also allows the product to be used as a bulletin board, making it a great option when you want to create a thinner and flexible surface that can be pinned to for sound absorption.

Extra-wide sound-absorbing room divider—Silent Divider Feltra is ideal for larger, open spaces where a bulletin board needs to be supplemented with a partition. The large textile surface helps reduce sound reflections while allowing the room to be divided into distinct work, meeting, or lounge areas.

SilentDirect PET Square 592x592mm is a compact sound absorber made of recycled polyester that can be used to build larger absorbent wall panels. The panels can be combined with a sound-absorbing bulletin board when a larger portion of the wall needs to contribute to the room’s acoustics.

Sound-absorbing fabric room divider – Silent Divider Feltra is used to create separate zones, while its soft textile surface helps reduce disruptive sound reflections. It is particularly suitable for offices, schools, and other open environments where multiple activities take place simultaneously.

Extra-wide sound-absorbing curtain—Silent Curtain Feltra— is designed for larger windows, glass partitions, and wide surfaces where a standard curtain does not provide sufficient coverage. The larger fabric surface can complement wall-mounted bulletin boards and absorbers by treating additional hard and reflective surfaces in the room.