quality products made in Germany
since 1963
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soniflex - your online shop for

sound insulation, sound proofing and noise control

soniflex provides private, trade and commercial customers with professional noise control solutions. For this, soniflex can draw on the extensive know-how and many years of experience that the parent company Cellofoam, a leading specialist for technical noise control products for industrial applications, has acquired in the areas of sound attenuation, sound insulation and sound conditioning.

We offer the right product for any application. Effective noise control has long since been playing an important role in industrial production. But also in the private and commercial sectors, targeted noise reduction measures are of growing importance.

„One day, humankind will have to combat noise just as relentlessly as we are fighting the cholera and the plague“.
Robert Koch (Nobelpreisträger für Medizin 1905).

The soniflex range of products: from sound insulation sheets, sound absorbers and heavy layers right up to special soundproofing foam for outdoor applications:

Tips and tricks: How to install our acoustic panels

Discover how easy it is to prepare and install our noise-control panels. Watch our tutorials on how to sound-insulate a compressor (video 1), how to peel the protective film off the self-adhesive layer (video 2), or how to assemble our duct silencer (video 3), how to install our acoustic panels (Video 4).

Why so many customers decide to buy from soniflex

As pioneering manufacturer of effective noise-control products from acoustic foams and other materials, we use a state-of-the-art quality management system and are certified according to ISO 9001:2015.
  • Online shop since 2008
  • Top-quality products directly from the German manufacturer
  • More than 50 years of experience in development and manufacturing
  • Owner-managed medium-sized company
  • Excellent service & consultancy (several languages spoken)
  • Our service does not end once the goods are shipped.
  • Virtually all products are on stock and can be shipped within 24 hours
    (Mo. through Fr.)


  • Fast delivery (DHL package)
  • Safe and convenient payment per PayPal, credit card or bank transfer
  • Rapid SSL encryption
  • Our company is ISO-certified according to ISO 9001:2015.

We serve customers across the EU, for instance:

  • Private individuals
  • Artisans, craftsmen, small businesses
  • Industrial enterprises
  • Municipal facilities
  • Universities and research institutes
  • Dealers selling technical and construction materials
  • Schools and kindergartens
  • Restaurants and hotels
  • Recording studios, musical societies, musicians
  • Shops
  • Trade-fair booth builders
  • Businesses specializing in heating, ventilation, AC
  • Architects and construction companies
  • Offices and law firms
  • Clinics, hospitals and doctor’s offices
  • Farmers, breeders and other animal owners

Application examples provided by our customers

How best to install acoustic panels? What does a curtain wall look like? How can I build an outdoor noise-control wall? What are the most effective measures for reducing the noise level in schools or kindergarten facilities? What should I do to minimize the noise emission of my heat pump? In our “Testimonials" section you will find our customers’ reports on how they are using soniflex products. Read on for inspiring ideas, valuable tips, informative photographs, detailed descriptions and easy-to-recreate solutions for a wide range of noise problems.
Noise reduction in outdoor application (garden wall)

We needed a privacy and noise screen for our garden plot located in a residential area. The solution was a “sandwich construction” consisting of a solid wooden fence (2 m high) in combination with weather-resistant soni RESIST UV noise-control panels as the middle layer.

read more...
Sound conditioning of rooms

A room’s acoustic atmosphere depends essentially on the design and the surface structure of ceiling, walls, floor and fittings. The highly reflective surfaces favored in modern architecture lead to an extended reverberation time, causing high noise levels that interfere with speech intelligibility.

read more...

The basics of noise control

What are the basic principles of noise control?
Noise can be reduced through sound insulation and/or sound attenuation.
What is the difference between insulation and attenuation?
Sound insulation materials reflect and redirect the sound waves in a different direction, reducing the intensity of the noise in the original direction of propagation.

Insulation effects are typically achieved by heavy materials, but also by special foams such as used for our products soni RESIST or soni PROTECT R.

A value called sound transmission loss quantifies the sound insulation capacity of the material. It is calculated as the ratio of the total incident sound energy to the sound intensity that the material lets through. A high sound transmission value indicates a low transmission factor and equals high sound insulation effectivity. Sound transmission loss is a logarithmic value and depends on frequency.

By how many dB the intensity of the transmitted noise can be reduced depends on the individual starting situation (initial noise level, frequency band, specific sound-insulation value of the construction component to be insulated, potential sound bridges etc.).

In the case of sound attenuation (absorption), a certain proportion of the sound energy is transformed into heat energy.

The sound absorption coefficient is calculated as the ratio of incident to absorbed sound waves in a particular frequency band. Sometimes this value may be higher than 1, which is due to the fact that in these cases the effective surface of the absorber material is larger than its geometrical surface.

With clever combinations of sound insulation and sound attenuation measures we achieve an excellent overall noise control effect.
What is the difference between solid-borne sound and air-borne sound?
Solid-borne sound is defined as sound waves propagating within or on the surface of a solid medium.

Solid-borne sound attenuation measures prevent the transformation of solid-borne sound into air-borne sound. For this purpose, the medium’s surface is covered with a homogenous layer of acoustic material (adhesive fixation or other) that transforms part of the sound energy.

Solid-borne sound insulation measures involve elastic layers that reflect the sound waves, thus preventing their propagation.

Air-borne sound is defined as sound waves propagating through the air.

Air-borne sound insulation measures, usually in the form of heavy and preferably flexible materials, prevent the sound waves from passing through walls, enclosures or other surfaces separating two areas.

Air-borne noise attenuation measures use sound absorbers to absorb sound energy, especially materials with a large surface area that has open pores through which the sound waves can enter. The resulting oscillation of the air molecules in the pores transforms sound energy into heat due to friction losses at the pore walls.
Sound deadening
In the case of machines, appliances and vehicle components, noise emissions are often caused by the inherent vibration of the casing. Effective noise control involves sound deadening measures that minimize these vibrations. For this purpose, heavy layers are applied to the respective metal surfaces to increase their mass. Excellent materials for the sound deadening of metal sheets and metal parts are our heavy layers soni EVA (synthetic) or soni HEAVY and soni HEAVY ALU (both bitumen-based).
Sound conditioning of rooms / reverberation / sound absorbers
The often quite high noise level in restaurants, clubhouses and offices, but also in rooms or staircases in private houses makes them uncomfortable places to stay.
An important factor for the acoustic situation in a particular room is the level of reverberation. Reverberation / lingering noise is the result of sound waves being reflected on hard surfaces (e.g. walls, ceilings or floors). The noise level in a room can be substantially lowered by reducing the reverberation, or more specifically by shortening the reverberation time. This is achieved by the installation of acoustically effective surfaces that will absorb (part of) the sound waves and prevent their repeated reflection.

The result: lower noise level and hence enhanced speech intelligibility. Improved acoustic conditions make for a much more pleasant atmosphere. The most effective sound absorbers include porous or fibrous materials such as open-cell foams or non-wovens. But also certain closed-cell foams with a special cell structure, for instance our soni RESIST, score with good sound absorption capacity.
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quality products made in Germany
since 1963
excellent service and support
secure payment