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Reverberation chamber

Reverberation Chamber – Why it is important for the development of effective sound absorbers


What is a reverberation chamber?

A reverberation chamber is a specialised test room for acoustic measurements. Its surfaces are almost entirely sound-reflective, so that sound waves are distributed evenly throughout the room and reverberate for a long time.

These unique properties enable acoustics experts to determine precisely how well a material absorbs sound and what effect it has on room acoustics. For this reason, reverberation chambers are used worldwide in the research, development and quality testing of sound absorbers.

At Cellofoam, we have our own reverberation chamber and carry out the measurements ourselves. This enables us to directly test and further develop the acoustic properties of our products, and to document the measurement results in a transparent manner.


How does a reverberation chamber work?

A reverberation chamber has very few sound-absorbing surfaces, unlike living rooms, offices, or classrooms. In a reverberation chamber, sound is reflected almost entirely off the walls, ceiling, and floor, creating what is known as a diffuse sound field, in which sound strikes a test object from all directions.

During a measurement, the reverberation time of the empty room is first determined. The material to be tested is then introduced, and the measurement is taken again. The change in reverberation time allows us to calculate how much sound energy the material absorbs.

Thanks to our in-house reverberation chamber, we can perform these measurements on-site and evaluate the effectiveness of acoustic solutions under controlled conditions.


What parameters are measured in a reverberation chamber?

Reverberation chambers are primarily used to determine key acoustic parameters:

• Sound absorption coefficient (α) - How much sound energy is absorbed by a material?

• Reverberation time (T60) - The time it takes for the sound level to decay by 60 dB

• Equivalent absorption area

• Acoustic effectiveness of wall and ceiling absorbers

These values help to objectively compare the performance of acoustic products and select them specifically for different rooms.


Why Are Reverberation Chamber Measurements Important?

Anyone who wants to improve the acoustics in a room needs reliable data. Only through measurements that comply with standards can one determine how effectively a sound absorber actually works.

The values determined in the reverberation chamber form the basis for:

• planning room acoustics measures

• selecting suitable acoustic products

• calculating reverberation times

• optimizing offices, living spaces, schools, or meeting rooms

This provides planners, businesses, and individuals with a transparent basis for their decisions.


Which products are tested in the reverberation chamber?

Typical test items at our facility include:

• Acoustic panels
• Wall absorbers
• Acoustic art
• Partition walls

The measurement results show how effectively the products can reduce reverberation and improve speech intelligibility.


Reverberation Chamber and Room Acoustics – The Connection

Measurements in the reverberation chamber are conducted under idealized laboratory conditions. The results provide a reliable assessment of how our soundproofing products will perform later in real-world rooms.

Especially in modern living spaces with large glass surfaces, open floor plans, or hard flooring, our soniflex sound absorbers can help significantly reduce disruptive reverberation and create more pleasant acoustics.

The data collected in our in-house reverberation chamber helps us provide customers with informed advice and recommend suitable solutions for a variety of room configurations.


Conclusion

A reverberation chamber is one of the most important tools in acoustics. It enables the precise measurement of sound absorption and provides objective data for evaluating acoustic products. For consumers, this means greater transparency and the assurance that tested sound absorbers can actually help improve room acoustics.

With our own reverberation chamber and the ability to conduct measurements ourselves, we at soniflex lay the foundation for high-quality, verifiably tested acoustic solutions.


Frequently Asked Questions (FAQ) About Reverberation Chambers

What is the difference between a reverberation chamber and a normal room?
A reverberation chamber has highly sound-reflective surfaces and a long reverberation time. Normal rooms contain furniture, textiles, and other elements that absorb sound and reduce reverberation.

Why are sound absorbers tested in a reverberation chamber?
Only under standardized conditions can the acoustic properties of different products be objectively compared and evaluated. The measurement results serve as an important basis for selecting suitable acoustic solutions.

Does soniflex have its own reverberation chamber?
soniflex is a brand of Cellofoam GmbH. Cellofoam operates its own reverberation chamber for acoustic measurements and product testing. As a result, soniflex customers benefit from precisely tested acoustic solutions and verifiable measurement data.

Are reverberation chamber measurements relevant for private living spaces?
Yes. The parameters determined in the reverberation chamber help in selecting suitable acoustic solutions for living spaces, home offices, kindergartens, schools, and much more.

Can reverberation be reduced in living spaces?
Yes. Acoustic wall hangings, wall absorbers, or acoustic panels can often significantly reduce reverberation and improve speech intelligibility.

Section of a PES fleece absorber with colored fleece surface, anthracite color Section of a PES fleece absorber with colored fleece surface, anthracite color
soni COLOR
soni COLOR – Coloured acoustic absorbers for modern interior design and optimal acoustics Acoustic panels from soniflex: Design meets function The soni COLOR acoustic absorber consists of a high-quality white polyester non-woven laminated with a finely structured felt surface in attractive, trendy colours. This combines aesthetic design and effective sound absorption to create the perfect solution for rooms where a feel-good atmosphere and acoustics are equally important. With decorative soni COLOR acoustic panels, you can create pleasant room acoustics in offices, nurseries, classrooms, meeting rooms or living areas, improving concentration, communication and comfort. Pleasant room acoustics with style The combination of sound-absorbing non-woven and open-pored felt surface effectively absorbs sound and significantly reduces reverberation. For a noticeable improvement in room acoustics, we recommend covering 30–50% of the wall or ceiling surfaces with soni COLOR. Even distribution of the panels ensures a harmonious sound and a significantly quieter room effect. Safety through tested fire protection soni COLOR meets the fire standards required for the construction sector in accordance with the European standard DIN EN ISO 13501. This makes the acoustic absorber safe, durable and versatile – even in public or commercial spaces with strict fire safety requirements. Ideal for: ✔ Offices and meeting rooms ✔ Classrooms and educational spaces ✔ Living rooms and hallways ✔ Kindergartens, medical practices and public buildings Easy installation – flexible and clean Installing soni COLOR acoustic panels is incredibly easy: ✔ With our soni SPECIAL ADHESIVE, you can securely attach the panels to smooth, clean surfaces. ✔ If you do not want to cover the entire surface, we recommend soni VELCRO TAPE – ideal for flexible wall mounting (not suitable for ceiling mounting). This allows you to design your rooms quickly, cleanly and individually – without any great effort. Advantages of soni COLOR at a glance ✔ Effective sound absorption for noticeably better room acoustics ✔ Decorative felt surface in modern, trendy colours ✔ Complies with fire standard DIN EN ISO 13501 ✔ Easy installation with adhesive or Velcro tape ✔ High-quality polyester fleece, durable and dimensionally stable ✔ Ideal for offices, schools, practices, living spaces and public buildings

Content: 0.5 m² (€71.80* / 1 m²)

€35.90*
Details
White PES fleece panel, horizontal, with a mottled felt surface in the color red White PES fleece panel, horizontal, with a mottled felt surface in the color red
soni COLOR RD
soni COLOR RD – Acoustic inserts for grid ceilings soni COLOR RD is our high-quality acoustic insert for grid ceilings measuring 620 x 620 mm, which can be easily inserted into existing suspended standard grid ceilings or Odenwald ceilings (OWA). The elements consist of a sound-absorbing white polyester fleece, laminated with a thin, mottled felt surface in current trend colours. They thus combine aesthetic design and effective sound absorption in one product. Grid ceilings – function and advantages Grid ceilings consist of inserts in a supporting grid and are mainly used in offices, schools, medical practices, restaurants and public buildings. They enable flexible room design, easy access to cables and the integration of lighting, ventilation or acoustic elements. A common problem with grid ceilings is excessive reverberation, as the smooth ceiling surfaces reflect sound. soni COLOR RD noticeably reduces reverberation and noise levels, creating quiet, pleasant working and learning environments. Effective room acoustics with soni COLOR RD soni COLOR RD acoustic elements significantly reduce the sound level in a room and help to improve room acoustics in offices, meeting rooms or doctors' surgeries. soni COLOR RD is also a proven acoustic element for noise reduction in schools, daycare centres and nurseries. soni COLOR RD acoustic elements significantly improve room acoustics, reduce disturbing noises and increase speech intelligibility. They are ideal for: ✔ Offices & meeting rooms – less noise, better concentration ✔ Medical practices & care facilities – more pleasant room climate for patients and staff ✔ Schools, daycare centres & nurseries – targeted noise reduction for concentrated learning ✔ Restaurants & canteens – quieter atmosphere for guests ✔ Home offices & living spaces – comfortable, relaxed environment Fire protection and standards soni COLOR RD complies with the fire standards required for the construction industry in accordance with DIN EN ISO 13501-1. This means that the acoustic elements can be used safely in ceilings and as wall cladding – wherever fire protection regulations must be observed. Installation instructions – flexible and simple ✔ Installation in grid ceilings: The elements are simply inserted into the grid ceiling – no additional fastening is necessary. ✔ As wall absorbers: For installation on smooth, clean surfaces, we recommend our soni SPECIAL ADHESIVE ✔ Alternative installation: soni VELCRO TAPE can be used for removable fastening. Note: Only suitable for wall mounting, not for ceilings ✔ Or with WIKO spray adhesive, which is also very well suited for installing wall absorbers Design meets function Thanks to its modern felt surface and wide range of colour options, soni COLOR RD can be creatively integrated into any interior design. This harmoniously combines acoustic measures and interior design, ensuring a pleasant noise level in offices, educational institutions and catering establishments.

Content: 0.384 m² (€67.19* / 1 m²)

€25.80*
Details
Overview of all motifs of our acoustic pictures soni PICTURE Overview of all motifs of our acoustic pictures soni PICTURE
soni PICTURE
soni PICTURE – acoustic pictures for stylish noise reduction and improved room acoustics Our soni PICTURE acoustic pictures are a special kind of sound absorber: soni PICTURE allows you to design rooms aesthetically while optimising their acoustics. We combine modern design with efficient noise protection – ideal for offices, schools, restaurants, meeting rooms or private living spaces. Structure and function of the soni PICTURE soundproofing picture The soni PICTURE soundproofing picture consists of sound-absorbing melamine foam, which is invisibly inserted into a wooden frame profile behind the printed fabric. Incident sound waves are thus effectively absorbed, reducing reverberation and background noise. For a clean look all round, the edges of the acoustic picture are also printed, giving the picture a frameless and modern appearance. Effective sound absorption for offices, schools and homes Our soni PICTURE acoustic pictures offer excellent sound absorption and can be used anywhere where noise levels need to be reduced and an attractive appearance is important. Typical locations include: ✔ Offices and conference rooms – for better speech intelligibility and concentration ✔ Canteens and restaurants – for a quieter atmosphere ✔ Classrooms and educational spaces – for more comfortable learning and less reverberation ✔ Living rooms and hallways – for greater well-being and comfort By reducing noise levels and improving acoustics, soni PICTURE acoustic pictures create a more pleasant working or living environment that can increase both well-being and productivity. Design meets function With the ideal combination of acoustic foam and decorative motifs, soni PICTURE becomes a functional design element. Each picture not only contributes to a noticeable improvement in room acoustics, but also adds aesthetic accents to any interior. Whether as a single acoustic picture or a multi-part wall design, soni PICTURE adapts flexibly to your space and your style.

Variants from €79.90*
€219.90*
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Ausschnitt einer Melaminschaumstoffplatte zur Schallabsorption mit 3 Farben zur Auswahl Ausschnitt einer Melaminschaumstoffplatte zur Schallabsorption mit 3 Farben zur Auswahl
soni PROTECT
Out soni PROTECT noise absorber is made from an open-cell melamine foam (Basotect®) with outstanding sound-absorption capacity. Use soni PROTECT to significantly improve the acoustic conditions in interior spaces. With soni PROTECT acoustic panels fixed to ceilings and walls, your room will be much less reverberant.  soni PROTECT has been tested successfully according to European as well as German fire safety standards and can therefore be used wherever you need to reduce the noise level with materials that meet strict fire safety regulations. What is more, soni PROTECT is aging-resistant, free of mineral fibers and physiologically perfectly safe. All in all, an absolute classic for optimizing acoustics conditions in buildings. For edge-to-edge installation we recommend using soni PROTECT F. It consists of the same material as soni PROTECT, but has beveled edges all around, which make for very neat joints and an attractive surface design while actually helping conceal any uneven patches in the ceiling or wall surface. Please note: We do not recommend soni PROTECT for use on wall areas that are liable to be hit or touched, as the sound insulation panels are sensitive to mechanical stress. soni PROTECT and soni PROTECT F can easily be cut to the desired size with a carpet knife. For fixing the absorber panels on the wall or ceiling we recommend our soni SPECIAL ADHESIVE. Basotect® is a registered trade mark of BASF SE. 

Content: 0.5 m² (€0.00* / 1 m²)

From €17.50*
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Melamine foam panel with a milled pattern for sound absorption Melamine foam panel with a milled pattern for sound absorption
soni PROTECT Art
soni PROTECT Art is a highly efficient acoustic panel made of an open-cell melamine foam (Basotect®). The sound absorber soni PROTECT Art convinces with exceptionally good absorption properties and a visually very appealing design. The relief-like surface offers an enlarged absorber area and thus improves the room acoustics enormously.With edge-to-edge installation or combined with our soni PROTECT panels, unique stylish and visually appealing wall motifs can be created. soni PROTECT Art combines a sophisticated look with effective sound reduction.soni PROTECT Art has been tested successfully according to European and German fire safety standards and can therefore be used wherever you need to reduce the noise level with materials that meet strict fire safety regulations.In addition, soni PROTECT Art is highly resistant to ageing, free of mineral fibres and physiologically perfectly safe.

Content: 0.5 m² (€99.80* / 1 m²)

Variants from €47.90*
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All 9 colors of our movable walls lined up next to each other. All 9 colors of our movable walls lined up next to each other.
soni ROOM DIVIDER
Our soni ROOM DIVIDER is a sound absorber of a very special kind, because in addition to delivering effective sound-conditioning, it provides increased privacy for your employees and allow you to freshen up all types of rooms with the latest trend colors. The core of our soni ROOM DIVIDER is a soft non-woven panel, reinforced on both sides by a layer of compacted polyester non-woven. The visible surfaces are covered with dirt-resistant and decorative felt material of high quality. The rounded upper corners of the acoustic partition make for a modern, attractive appearance. Our soni ROOM DIVIDER score with a very good sound-absorption capacity and can be flexibly deployed wherever you need to reduce the noise level. The easy-to-assemble acoustic partitions blend harmoniously into the office architecture and create pleasant acoustic conditions for concentrated work. Practical tip: Both sides of the partition can be used as pin board. The optional high-quality accessory support feet soni FIX Base (not included in the scope of delivery) made from hard-wearing stainless steel make assembly and installation of the acoustic partition soni ROOM DIVIDER absolutely easy.

Variants from €263.90*
€311.90* €389.90* (20.01% saved)
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