The combination of StratocellWhisper, heavy foil and an additional air cushion results in a particularly high-performance multi-layer system for sound and vibration insulation. This principle uses an extended form of the mass-spring-mass system, which effectively reduces both airborne and structure-borne noise.​
 
Construction principle: mass-spring-mass:
The heavy foil forms the outer "mass" and blocks airborne noise due to its high surface mass.
The Stratocell Whisper acts as a "spring", absorbing sound energy and decoupling mechanical vibrations.
The air cushion reinforces this decoupling as it represents an acoustic resonance layer that attenuates particularly low-frequency waves.​
 
Exemplary layer structure:
Base (sound-repellent side): Heavy foil 3–5 mm, mass weight ≥ 5 kg/m²
Air gap (30–50 mm, double if necessary): acts as a resonant buffer
Stratocell Whisper (40–60 mm): absorbs sound and suppressesreflections.
 
This combination creates an extended range of attenuation:
The air gap lowers the resonance frequency of the system.
The heavy foil prevents sound transmission.
Stratocell Whisper absorbs medium and high frequencies.
Together, all layers can achieve a reduction of over 30 dB, depending on the structure and frequency range.
 
Technical notes:
A 50 mm air gap behind Stratocell Whisperdrastically increases absorption at low frequencies and can lead up to absorption class A (NRC ≈ 1.0).​ If a second cavity is added (e.g. a double layer of air),the sound path lengthens and the acoustic impedance improves again.
 
Application:
This construction is particularly used in areas with a low and broadband sound spectrum:
Soundproofing enclosures for HVAC systems, transformers, BESS systems, and combined heat and power plants
Machine enclosures and enclosures in industrial environments. Acoustic walls and partition systems with requirements for high building acoustic performance.
 
Result:
The additional integration of an air cushion between the heavy-duty film and Stratocell Whisper creates an extremely efficient, broadband soundproofing structure – ideal for applications where there are high requirements for sound insulation combined with effective sound absorption.

Our acoustic enclosures for heat pumps, air conditioning and refrigeration systems are made entirely of aluminum, with a base frame made of an aluminum plug-in frame with a bolted connection. Individual modules can be combined to be able to enclose larger systems without the installation on the construction site becoming a problem.

In the case of rental systems, there is also the advantage that after the rental period, the sound hoods can be dismantled without much effort to reuse them in other projects and systems.

In addition, our sound hoods and sound barriers, like all products, are subject to a life cycle, which is why we take into account the factor of dismantling and recycling as early as the design stage. Our design principles, which facilitate subsequent disassembly, include, above all:

Using detachable or reversible joining techniques such as screws, rivets, clips instead of adhesives or welding, so that components can be easily separated. In this way, we prevent permanent connections and connections that are difficult to dissolve mechanically or thermally.

Even the internal insulation is not glued but mechanically secured, so that it can be removed at any time with a flick of the wrist.

In addition, we reduce the variety of materials to a few single-type materials or mono-materials to enable single-type recycling and facilitate separation. In the production of aluminum panels, the offcuts are consistently used to produce other parts such as mechanical, static fuses and covers. In this way, we prevent the mixing of different alloys, which leads to a downsizing of the material quality during aluminum recycling.
 
The design also considers the easy accessibility of all connections and components, e.g. through standardized screws and accesses and corresponding clearances.

Use of environmentally friendly, recyclable materials and coatings that do not hinder recycling.