CHF 5m · Seed · Deeptech · Lausanne, Switzerland
Image: Sonexos/Bosch Media Service.
Lausanne-based Sonexos has raised CHF 5m in new equity financing to industrialise its plasma-based active noise-control technology. The pre-Series A announcement says Valquest Partners led the round, with participation from Bosch Ventures, industry angels and private investors. The company will use the capital for industrialisation, customer programmes, reliability and regulatory work, hiring and wider patent protection.
Industrialising a thinner route to low-frequency control
Low-frequency noise from fans, compressors and motors is awkward to manage because passive absorbers become bulky as frequencies fall and can obstruct airflow. Sonexos' Plasmapanel instead uses a software-controlled plasma layer to absorb sound at a surface, packaged in a thin module without moving parts. The company says application-specific prototypes have reduced low-frequency noise by up to 20 dB in ventilation systems and 16 dB in domestic appliances; those results are prototype claims, not evidence of uniform performance across installations.
The commercial proposition is not simply a smaller acoustic component. Sonexos says it is running paid prototype-integration programmes with global appliance and HVAC manufacturers, and plans to sell turnkey panels with integration support while also supplying components and software that larger OEMs can build into their own products. That model can put its technology inside several product categories without Sonexos manufacturing every surrounding system, but it also makes qualification, electronics cost, reliability and customer design-in central to each sale.
Bosch Ventures says Sonexos is already integrating prototypes with international appliance and HVAC manufacturers. The company also points to STMicroelectronics for electronics development and Vandewiele subsidiary Roj as a route to series manufacturing. These partnerships narrow the path from laboratory hardware to an OEM programme, while leaving Sonexos responsible for showing that performance transfers into qualified products at repeatable cost.
Qualification is the next milestone
The most advanced programmes target series production in early 2028, subject to integration, regulatory compliance and new-product introduction. A July collaboration with SIT is intended to integrate a radial active silencer with fan platforms for data centres, battery storage and industrial cooling, with a first demonstrator planned for CES 2027. Those are forward milestones rather than completed deployments. The round therefore finances the expensive middle of deep-tech commercialisation: turning working prototypes and paid engineering programmes into products that OEMs can certify, manufacture and buy repeatedly.
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Sources checked:
Sonexos company announcement · Bosch Ventures announcement · Tech.eu Funding Explorer
