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Using our unique skills and commercially-informed expertise, we address many of the most challenging problems in sound, delivering solutions that help set our customers apart from their competition.

Domestic Appliances

Low-frequency noise remains one of the most persistent challenges in modern household appliances — particularly in rangehoods, dryers, ovens, and other systems where airflow and vibration are inherent to their function. In these compact designs, traditional solutions such as thick acoustic foam or bulky passive baffles often cannot be fitted without restricting airflow, impeding heat dissipation, or compromising product form.

Equally, conventional active noise-cancelling techniques, while effective in enclosed spaces like headphones, fail to operate reliably in the open, turbulent conditions found in appliance ducts and vents. As a result, many products continue to emit unwanted low-frequency noise that detracts from perceived quality and user comfort.

Sonexos eliminates these limitations with its Plasmapanel technology — a thin, solid-state active system that neutralises low-frequency noise at its source. Integrated directly within an appliance’s ventilation path, the Plasmapanel delivers brand low frequency attenuation without moving parts, enclosed air volumes, or added bulk.

For appliance manufacturers, this translates into quieter products that meet consumer expectations for refinement and design. The result is a measurable competitive advantage — enhanced comfort and compliance, achieved without sacrificing airflow efficiency, weight, or production cost.

Cabin Interiors

Vehicle and aircraft cabins are becoming quieter by design, yet low-frequency noise remains the most difficult to eliminate. As electric propulsion, lighter materials, and compact HVAC systems replace traditional sources of masking sound, new tonal and structural resonances have emerged. These low-frequency components dominate the acoustic character of the interior, shaping how refined or fatiguing it feels.

Traditional countermeasures — such as heavy insulation, tuned absorbers, or passive mounts — offer only partial improvement. They struggle to control the diffuse reverberant field that builds up inside enclosed spaces, where low-frequency waves persist long after their source. Even active systems optimised for engine or road noise lose effectiveness once reflections and modal behaviour dominate.

Sonexos addresses these limitations with its Plasmapanel® technology — a thin, solid-state active surface that reduces low-frequency noise across both direct and reverberant fields. Integrated into cabin panels, headliners, or ventilation structures, Plasmapanels® deliver broadband attenuation without moving parts or added mass, enabling deeper, more uniform quieting than traditional methods.

For OEMs and tier-one suppliers, this translates into a new dimension of cabin refinement — one that enhances passenger comfort, supports brand identity, and redefines what “quiet” feels like inside the modern vehicle or aircraft. By extending active control throughout the cabin, Sonexos transforms silence into a measurable design asset.

Transportation HVAC

Heating, Ventilation, and Air Conditioning (HVAC) systems are among the most persistent noise sources in modern vehicles, aircraft, and rail cabins. Passengers expect quiet, refined environments, yet HVAC units generate broadband low-frequency noise that conventional materials cannot effectively suppress. Duct paths are constrained, airflow rates are high, and space for insulation or silencers is minimal.

Traditional damping and active noise-cancelling methods offer only partial relief. In open airflow channels — such as those feeding conditioned air to passenger cabins — turbulence and rapid pressure changes disrupt phase control, making consistent attenuation impossible.

Sonexos removes these limitations with its Plasmapanel technology — a compact, solid-state acoustic module that neutralises low-frequency HVAC noise directly within ducts or plenum spaces. Operating without moving parts, the Plasmapanel achieves broad low frequency attenuation in a thin, easily integrated form factor.

For transportation manufacturers and system suppliers, this means quieter cabin airflow, greater passenger comfort, and new freedom in acoustic and thermal design. Whether used in aircraft environmental systems or rail and automotive HVAC modules, Sonexos offers a scalable, maintenance-free path to next-generation acoustic refinement.

Domestic and Commercial Ventilation

Ventilation systems are essential to air quality and comfort — yet they remain one of the most difficult sources of noise to control. From home ventilation units to large-scale HVAC installations in offices, hospitals, and public buildings, low-frequency noise generated by fans, ducts, and airflow resonances often dominates the acoustic environment. Traditional silencers and foam-based insulation can reduce higher frequencies, but they struggle to suppress deep, structural noise without adding bulk or restricting airflow.

As buildings become more energy-efficient and compact, space for acoustic treatment is increasingly limited. Passive methods alone cannot achieve the desired reduction, and conventional active systems have proven impractical within complex duct networks and variable flow conditions. The result is a persistent hum or vibration that undermines comfort, concentration, and perceived quality in both residential and commercial spaces.

Sonexos resolves this challenge with its Plasmapanel® technology — a solid-state acoustic module that targets low-frequency noise directly within ventilation ducts or plenum spaces. Operating without moving parts, the Plasmapanel® achieves broadband attenuation while preserving airflow efficiency and compact system design.

For HVAC manufacturers, system integrators, and building technology providers, Sonexos enables a new level of acoustic performance — quieter, more comfortable environments that enhance occupant well-being and meet modern standards for energy, design, and sound quality.

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About us

Sonexos is a Swiss engineering company specializing in high-performance audio and sound control. We develop and supply advanced solutions for audio enhancement, noise and vibration control to clients in the consumer, transportation, automotive and industrial sectors.

A core innovation is our Plasmapanel technology—an active acoustic solution that achieves broadband sound absorption in enclosed spaces such as vehicle cabins, rooms, offices, ducts, and machinery. Unlike passive treatments that rely on mass or porous materials, Plasmapanel actively absorbs the energy of incident sound waves upon contact, delivering lighter, more space-efficient noise reduction across a wide frequency range.

 

Beyond our R&D capabilities, Sonexos provides strategic advisory services to help clients accelerate innovation in sound and acoustics. Our offerings include product design consultation, acoustic benchmarking, system integration support, and scalable manufacturing guidance—ensuring successful deployment of advanced technologies and long-term differentiation in the marketplace.

By combining deep technical expertise with a pragmatic, system-level approach, Sonexos empowers companies to elevate acoustic performance where it matters most – where sound enhances experience.