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How do you soundproof a wall with sound absorbers?

Wall absorbers are used to treat the acoustics inside a room. When speech, music, or other sounds hit a hard wall, a large portion of the sound energy is reflected back. Many simultaneous reflections can result in a long reverberation time, reduced speech intelligibility, and a sound environment that feels intense even though the original sound source is not unusually loud.

By replacing part of the reflective wall surface with absorbent material, the most prominent sound reflections are reduced. This is particularly useful in rooms with concrete, drywall, glass, tile, and other hard surfaces. This solution can be suitable for everything from living rooms and home offices to meeting rooms, schools, restaurants, studios, and industrial facilities.

It is important to distinguish between sound absorption and sound insulation. Wall absorbers reduce echoes and reverberation within the same room, but they do not typically block noise from neighboring rooms or sound transmission through the wall. Such problems require sound insulation measures that address the wall’s construction, mass, density, and connections.

For general acoustic treatment, we typically recommend treating the ceiling first. The ceiling surface is often large, unobstructed, and well-positioned to capture sound reflections. Wall absorbers then serve as an effective complement—or an alternative when the ceiling cannot be used. On the walls, it is also possible to target particularly problematic reflective surfaces and integrate the absorbers into the room’s interior design.

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Here are some benefits of installing sound absorbers on walls

Noise Reduction
Sound absorbers reduce reverberation and lower the noise level in a room. This is particularly useful in environments with a lot of background noise or where conversations and work need to be conducted in peace and quiet.

Better Work Environment
Reduced noise and less reverberation create a more pleasant work environment. This can help reduce stress and improve concentration for people working or studying in the room.

Better sound quality
Sound absorbers can improve sound quality by reducing unwanted echoes and distortions. This is particularly important in rooms where music or speech needs to be reproduced clearly, such as in conference rooms, meeting rooms, or auditoriums.

Increased privacy
By reducing sound transmission between rooms, sound absorbers can help create a more private and confidential work environment. This is particularly relevant in open-plan offices where several people share the same space.

Reduced Noise
If the room is used for activities that generate a lot of noise, such as conference calls or machinery operations, sound absorbers can help minimize noise and create a more productive work environment.

Energy and Cost Efficiency
By reducing reverberation and improving the acoustic environment, it may be less necessary to raise the volume to drown out background noise. This can lead to energy savings and lower costs for soundproofing or acoustic treatment in the long term.

Aesthetic Improvement
Sound absorbers can also be used as design elements to enhance the aesthetics of a room. They come in various shapes, colors, and materials, allowing them to be customized to match the room’s interior design.

How many sound absorbers do you need for a wall?

How many sound absorbers do you need?

With our free sound absorption calculation tool, you can quickly and easily calculate how many sound absorbers are needed to effectively reduce echoes and disruptive noise in various environments, such as offices, rooms, or other spaces.

What should you keep in mind when soundproofing a wall?

Sound-absorbing a wall involves reducing sound reflections and reverberation to create a more pleasant acoustic environment. To achieve the best results, it’s important to carefully plan the placement of sound absorbers, adapt them to the room’s conditions, and ensure that a sufficiently large area is covered. By using the right strategy, you can effectively improve acoustics and reduce unwanted noise.

Strategic Placement of Sound Absorbers
For sound absorbers to be as effective as possible, they should be installed on at least two walls in the room. The optimal approach is to place them in an “L” pattern, covering one long wall and one short wall. This reduces the risk of sound waves bouncing directly between opposite walls, which can create unbalanced acoustics and increased reverberation.

It is important to avoid installing sound absorbers on walls that are directly opposite each other. If sound absorbers are placed directly opposite each other, ineffective sound dampening can occur, allowing sound to continue bouncing between the two surfaces. By following an “L” pattern or strategically distributing the absorbers around the room, you’ll achieve more balanced acoustics and better sound absorption.

If space is limited, you should place sound absorbers wherever there is room, but as close to the sound source as possible. By absorbing sound waves early on, before they have time to spread and be reflected further into the room, you can achieve more effective sound dampening.

Cover Sufficient Surface Area for Optimal Effect
To achieve a noticeable improvement in acoustics, at least 20–30% of the room’s wall surface should be covered with sound absorbers. The larger the surface area that absorbs sound, the better the overall sound environment will be.

In office environments where conversations and background noise can be disruptive, it is particularly important to place sound absorbers near the workstation. A good starting point is to place one or more absorbers on the wall in front of the desk. If space allows, additional absorbers can be mounted on the short sides of the workstation or on the wall behind it to capture reflected sound waves.

In larger rooms or spaces where sound reflections are a more significant problem, it may be necessary to supplement with additional sound absorbers on both walls and ceilings. Sound reflected off the ceiling can increase reverberation time, and by using ceiling-mounted absorbers, you can create an even more controlled acoustic environment.

Effective Sound Absorption for a More Pleasant Acoustic Environment
Sound absorbers play a key role in improving a room’s acoustics by reducing reverberation time and lowering sound levels. Covering multiple surfaces in the room with sound-absorbing materials creates a more balanced acoustic environment where speech and other sounds are not amplified by reflections.

If you’re still experiencing a long reverberation time even after installing sound absorbers on the walls, it may be necessary to take additional measures. Adding more absorbers to the ceiling or to additional walls can help achieve the desired acoustic balance and create a more comfortable acoustic environment.

Sound-absorbing walls with acoustic panels is one of the most effective methods for improving the acoustics in a room. By placing absorbers on at least two walls and covering a sufficient surface area, sound reflections and reverberation time can be significantly reduced. With a well-thought-out strategy where the absorbers are placed close to the sound source and supplemented with additional sound-dampening measures as needed, you can create an optimal sound environment for both work and everyday life.

What should you consider before purchasing sound-absorbing panels for your walls?

Choosing the right sound absorbers for walls is crucial for improving a room’s acoustics and reducing unwanted sound reflections. To achieve the best results, it’s important to analyze the room’s acoustic issues, select the right type of absorbers, and place them strategically. By understanding how sound propagates and affects the environment, you can create a more pleasant soundscape and reduce disruptive noise levels.

Identify Sound Sources and Acoustic Problems
Before investing in sound absorbers, it’s important to identify which sound sources you want to reduce. Sound can come from external sources, such as traffic, neighbors, or surrounding buildings, but it can also be internal sounds reflected within the room, such as conversations, music, TV, or other electronic devices. By mapping where the sound originates and how it spreads, you can make more informed decisions about which surfaces need sound-absorbing materials.

Placement of Sound Absorbers
The placementof sound absorbersis crucial to their effectiveness. To achieve the best possible sound attenuation, absorbers should be installed where sound reflections are most pronounced. Hard surfaces such as concrete, glass, and wood tend to reflect sound more than soft materials, making it especially important to place absorbers in areas where sound waves bounce.

A strategic approach is to install sound absorbers on at least two walls to disrupt the path of sound as it travels through the room. If sound bounces freely between two hard surfaces, it can create an acoustic imbalance, leading to increased reverberation time and amplified sound reflections. To optimize sound absorption, it may therefore be beneficial to place absorbers on the walls in an “L” pattern, covering one long wall and one short wall.

Choosing the Right Sound Absorbers
There are several types of sound absorbers to choose from, and the choice depends on the type of sound you want to reduce. Acoustic panels are effective at dampening mid- and high-frequency sounds, making them suitable for office environments, meeting rooms, and home settings where conversation noise and echoes can be disruptive. Bass traps are specially designed to handle low-frequency sounds, making them ideal for recording studios or rooms where bass resonance is a problem. Sound-absorbing wall panels combine both aesthetics and function, making them a great choice for those who want a stylish solution that also improves acoustics.

Corner absorbers can be used to address sound buildup in the corners of a room, where sound waves tend to accumulate and create amplified sound levels. By combining different types of absorbers, you can create a more balanced and effective acoustic environment.

Measure and Adjust the Acoustic Environment
To gain a better understanding of how sound changes in the room after installing sound absorbers, it may be a good idea to use a sound level meter. By measuring sound levels both before and after installation, you’ll get a concrete idea of how well the absorbers are working. If the reverberation is still high, you may need more sound-absorbing surfaces or to adjust their placement.

Determine the Right Number of Sound Absorbers
The number ofsound absorbersneeded depends on several factors, such as the room’s size, shape, furnishings, and the specific sound issues you want to address. There is no exact rule, but a good starting point is to cover 20–30% of the room’s wall surface with sound-absorbing material.

If the sound issues are primarily due to high-frequency sounds, you may need more sound absorbers, while low-frequency sounds often require thicker and more specialized materials. The best way to find the optimal solution is to test different placements and adjust the number of absorbers as needed.

Investing in sound absorbers is a flexible process where you can start with a basic installation and then make adjustments as you go. If the acoustic environment still feels unbalanced, you can add more absorbers to the walls or ceiling to further improve the room’s sound quality.

How to Soundproof a Wall with Sound Absorbers

An effective wall solution starts with identifying the specific acoustic problem, selecting the right wall surface, and installing a sufficient amount of absorptive material. We recommend that you proceed step by step and evaluate the results before adding more absorbers.

1. Verify that the problem is indeed related to room acoustics

Listen for echoes, long reverberation, clapping reflections, or conversations that blend together. A simple test is to clap your hands and listen for a distinct tail or a quick, metallic flutter echo. You can also compare speech intelligibility at different locations in the room.

If the problem is instead voices, music, or noise coming through the wall, you’ll need to look into sound insulation. Wall absorbers can make the room more comfortable, but they don’t transform the wall into a sound-insulating structure.

2. Determine whether the ceiling should be treated first

For general sound absorption, we normally recommend starting with the ceiling. The ceiling is often the room’s largest unobstructed surface and can be treated without the absorbers competing with furniture, doors, and other wall fixtures.

The walls become particularly important when the ceiling has already been treated, when ceiling installation isn’t possible, or when a specific wall causes strong reflections. In narrow or long rooms, wall absorbers can also help break up reflections between parallel walls.

3. Identify the most important reflective surfaces

Start by considering where people speak, work, listen, or spend time. Walls near a dining table, conference table, desk, or other central acoustic zone are often more important than distant surfaces behind large pieces of furniture.

If there is a distinct flutter echo, you should treat at least one of the parallel surfaces between which the sound bounces. It’s best to distribute the absorbers across the wall surface rather than concentrating all the absorptive area in a corner.

4. Measure the available wall area

Measure the wall’s width and height, and mark doors, windows, outlets, radiators, vents, and built-in fixtures. Then calculate the usable surface area and check the dimensions against the absorbers’ dimensions.

Feel free to make a simple sketch or mark the outer edges of the panels with low-tack tape. This will allow you to check the height, spacing, and symmetry before drilling or gluing the panels to the wall.

5. Choose Absorbers Based on the Room’s Needs

For widespread use in homes, offices, schools, and public spaces, PES wall a flexible standard solution. In larger or noisier rooms, PES wall Deep Absorb be a suitable option when greater absorption depth is required.

Round or hexagonal panels can be used when the absorbers are to form groups or visual patterns. Thinner PET panels and acoustic textiles may be suitable as a simpler or complementary treatment, but should be selected based on the room’s actual needs and not solely on appearance.

6. Plan for an even and practical distribution

Place the absorbers where sound reflections are significant and where the panels are not at risk of damage. In conversation areas, wall panels at head and upper-body height are often appropriate. In hallways and larger spaces, a wider distribution along the walls can provide a more even effect.

Allow unobstructed access to electrical installations, ventilation, doors, and service points. Also ensure that the placement does not interfere with escape routes or other safety features.

7. Choose the mounting method based on the product and wall type

Always follow the mounting instructions for the acoustic panel you have ordered. Depending on the product, installation may be done using brackets, hidden fasteners, screws, or adhesive. Lightweight PET panels may also have other designated mounting options.

Check whether the wall is made of wood, concrete, brick, or panel material, and choose a mounting method that can support the substrate and the product’s weight. Ensure that the wall is clean, dry, and even when the mounting method requires it.

8. Install the panels carefully

Mark the placement of the panels using a level and a measuring tape. Install the first absorber and check that it is straight and secure before placing the rest at the planned intervals.

Avoid compressing or deforming the absorber material. An improperly deformed panel may function less effectively and result in an uneven visual appearance.

9. Evaluate the acoustic environment after installation

Repeat the same listening test as before the installation. Compare the reverberation, speech intelligibility, and how crowded the room feels when several people are speaking. For a more comparable assessment, the reverberation time can be measured before and after installation.

If the improvement is noticeable but insufficient, you can supplement the treatment with additional absorbers. Prioritize an untreated ceiling or other large reflective surfaces over automatically filling the same wall with additional panels.

10. Fine-tune the solution based on how the room is used

A meeting room primarily requires clear speech intelligibility, while a studio may demand more controlled placement and broader frequency treatment. In restaurants, schools, and industrial facilities, the solution often needs to cover larger areas because multiple sound sources are active simultaneously.

We therefore usually recommend that the final solution be evaluated based on the room’s size, materials, furnishings, and intended use. Wall absorbers provide the best results when they are part of a well-thought-out treatment of the entire room.

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Did you know that…

Did you know that sound absorbers on a wall don’t necessarily stop sound from passing through it? Many people believe that thick absorbers act as sound insulation, but in reality, they only dampen reverberation in the room. To effectively reduce noise levels on both sides of the wall, you need a combination of sound absorbers to manage reflections and high-density materials to block sound transmission. By also installing corner absorbers and using diagonally placed absorbers, you can break up sound waves even more effectively and create a quieter, more comfortable environment!

Products for soundproofing a wall with sound absorbers.

Here you’ll find wall absorbers for various rooms, wall surfaces, and visual styles. The selection includes standard panels, deeper absorbers, and geometric shapes for homes, offices, schools, restaurants, studios, and industrial settings. Choose a product based on the room’s acoustic needs, available space, and intended installation method.

PES wall is a flexible 50 mm wall absorber for a wide range of applications where speech, echoes, and harsh wall reflections need to be dampened.

PES wall Deep Absorb is a 100 mm deep wall absorber for larger or noisier rooms where a standard panel does not provide sufficient treatment.

PES Allergy wall is suitable for wall surfaces where reverberation and speech noise need to be reduced using a hypoallergenic, fabric-covered solution.

PES Circle Wall combines a circular shape with sound absorption and can be used to break up hard wall surfaces both visually and acoustically.

PES Hexagon Wall can be arranged in groups and patterns when wall absorbers are used to create zones or a more varied look.

Wall Rectangle (horizontal) is suitable for long wall sections, hallways, and areas above furniture where a wide, horizontal format is practical.

Wall square is a square wall absorber that can be installed individually or in groups for flexible adaptation to the wall surface.

SilentDirect PET Rectangle is a thin, rectangular PET absorber for easier acoustic improvement where thicker panels are not suitable.

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How do you soundproof walls with sound absorbers?

Creating a pleasant acoustic environment in a room involves reducing reverberation and sound reflections, which makes the sound feel more balanced and comfortable. By installing sound absorbers in strategic locations, you can effectively dampen unwanted sound, improve speech intelligibility, and create more harmonious acoustics. This is particularly important in environments where acoustic comfort is crucial, such as offices, restaurants, conference rooms, home theater systems, and recording studios.

Sound absorbers work by capturing and absorbing sound waves before they are reflected further into the room. They come in various materials and designs, such as acoustic panels, foam absorbers, and fabric-based solutions. The choice of absorbers depends on the room’s size, its intended use, and the type of sound that needs to be reduced. To achieve the best results, a combination of several sound-absorbing solutions is often required.

By installing sound absorbers in the right places, you can not only reduce disruptive noise but also improve the sound quality in the room. This is particularly important in environments where clear communication is crucial—such as meeting rooms, classrooms, and restaurants—where high noise levels can otherwise negatively impact the work environment and comfort.

Benefits of Using Sound Absorbers in a Room

Sound absorbers play a central role in reducing reverberation and dampening noise, creating a more controlled acoustic environment. One of the primary benefits is a reduced noise level, making the room quieter and more pleasant to be in. This is particularly important in open-plan offices and other environments where background noise can be disruptive.

By reducing noise levels, sound absorbers create a better work environment. High noise levels can increase stress and reduce concentration, which negatively impacts productivity. By installing sound absorbers, you can create a more focused and relaxed work environment where sound is better controlled and more pleasant.

Sound absorbers also improve sound quality by reducing unwanted echoes and distortions. This is crucial in environments where sound reproduction is important, such as recording studios, home theater systems, and conference rooms. When sound reflections are reduced, speech and music become clearer and more natural, creating a better audio experience for everyone in the room.

Another key benefit is increased privacy. By reducing sound transmission between rooms, sound absorbers can help create a more private and confidential work environment, which is particularly relevant in open-plan offices and healthcare settings where privacy is essential.

Strategic Placement of Sound Absorbers for Maximum Effect

For sound absorbers to deliver the best possible results, it is crucial to place them strategically. Walls are one of the most effective places to install absorbers, especially in rooms with hard surfaces where sound easily bounces off and creates echoes.

One of the most effective ways to reduce noise in a room is to arrange absorbers in an “L” pattern, covering one long wall and one short wall. This reduces the risk of sound waves bouncing directly between opposite walls, which can create unbalanced acoustics.

Ceiling absorption is also an important part of a complete soundproofing solution. The ceiling is often an overlooked surface, but sound is reflected upward and can create a long reverberation if not absorbed effectively. By installing ceiling absorbers, you can further improve the acoustics and reduce noise in the room.

The floor can also contribute to a better acoustic environment, especially if it is covered with carpets or other sound-absorbing materials. A combination of wall absorbers, ceiling absorbers, and soft flooring materials creates a more balanced acoustic environment and reduces disruptive noise.

Cover a sufficient area to achieve optimal results

For sound absorption to make a noticeable difference, at least 20–30% of the room’s wall surface area should be covered with sound absorbers. The larger the surface area that absorbs sound, the better the overall acoustic environment will be.

In office environments where conversations and background noise are a major part of the workday, it’s important to place absorbers near workstations and conversation areas. A good placement is to install absorbers on the wall behind and in front of the desk. In meeting rooms, absorbers can be mounted on the walls to reduce sound reflections and improve speech intelligibility.

In larger spaces, such as restaurants and conference rooms, it may be necessary to combine several types of sound absorbers, such as wall panels, ceiling tiles, and freestanding sound-absorbing screens.

Effective Sound Absorption for a Better Acoustic Environment

Using sound absorbers is one of the most effective methods for creating a more pleasant and functional acoustic environment. By reducing reverberation and sound reflections, you can improve the work environment, increase concentration, and create a calmer atmosphere.

If you’re still experiencing high noise levels despite having installed sound absorbers on the walls, it may be necessary to supplement them with additional measures. Covering more surfaces, such as the ceiling, or using furniture and carpets with sound-absorbing properties can help achieve a more controlled acoustic environment.

Whether it’s an office, a restaurant, a home, or a recording studio, the right choice and placement of sound absorbers can make a significant difference. With a well-thought-out strategy, you can create an optimal acoustic environment for both work and everyday life.