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NoiseTrap® Acoustic Panels

Sonobex has pioneered the development of a patent protected* and award winning acoustic panel technology, called NoiseTrap®, using our understanding of acoustic metamaterials. We design and manufacture a complete line of modular engineered systems incorporating NoiseTrap® acoustic panels.


With superior low-frequency performance, specifically targeted for power transformers, a NoiseTrap®panel achieves up to 34 dB attenuation for 100 Hz tonal applications, with an absorption coefficient of 1.00, whilst maintaining high transmission loss at higher frequencies, Rw (C:Ctr) = 44 (-1;-2 dB). Our innovative solutions stand up to the closest scrutiny and exceed the toughest of contractual expectations, enabling Sonobex to guarantee the acoustic performance of each design.

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No acoustic infill

Conventional solutions typically contain absorptive materials inside to achieve decent levels of noise reduction, but limited low-frequency performance. Infill materials typically degrade due to contamination and ingress of water, reducing its acoustic performance over its lifetime.

A NoiseTrap® panel is a completely galvanized steel construction that consists of coupled resonator elements that attenuate airborne noise; as such a NoiseTrap® panel has no acoustic infill or lining materials to provide acoustic performance.

An infill free NoiseTrap® panel, therefore, has a very high through-life performance compared to traditional solutions with little or no degradation of acoustic performance over time.

NoiseTrap® panels can be used where there is to be no risk of fibre migration or contamination such as food production plants and hospital environments. The complete absence of infill also facilitates ease of cleaning and drainage, making NoiseTrap® panels well-suited for chemical plants, refineries, and facilities handling hazardous materials.

Passive ventilation

Due to the uniqueness of the technology, panels can be designed with passive ventilation in mind in order to dissipate heat, renew ambient air and to evacuate gas leaks.

Sonobex has engineered a range of attenuating NoiseTrap® panels that allow air to pass through the apertures whilst reducing the noise transmission to the environment.

NoiseTrap® panels can be incorporated into a fully ventilated acoustic enclosure, in some cases removing the need for forced ventilation.

Freestanding barriers benefit from reduced wind loads; lowering foundation and installation costs.

Sonobex undertake computational fluid dynamics and conjugate heat transfer to optimise acoustic performance with airflow requirements.


NoiseTrap® panels can be used to construct simple acoustic shields to large acoustically isolated industrial buildings and is structurally designed for internal and external loading; the integrated steel frame systems carries the static and dynamic loads.

The integrated structural steel framing system enables a modular panel-to-panel construction to be utilised for smaller enclosure systems (up to a height of 6.5m).

Larger enclosures can be as easily realised by incorporating NoiseTrap® panels into a steel framework offering increased rigidity for specific applications.

Industrial noise control

Noise control in the power generation industry is becoming increasingly difficult.

Strict legislative obligations are placing pressure on OEMs to design and manufacture low noise level equipment, sometimes resulting in a trade-off with efficiency and manufacturing costs.

Noise levels in the form of a low-frequency hum generated by power and distribution transformers and by air compressors in the shale gas extraction process, as well as the high levels of noise emitted by turbines in large power generation plants, all require radical improvements to address this major environmental problem.

Our innovative noise control technology, NoiseTrap® acoustic panels, brings unrivalled performance in acoustic enclosures for these applications when incorporated into a steel framed system. NoiseTrap® technology can also be designed as an integrated solution into OEM industrial equipment.

Industrial acoustic enclosures are one of the many ways in which Sonobex can help provide a safe and quiet environment, by reducing the noise impact on workers and neighbouring communities.

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