Sonexos raises CHF 5 million to scale plasma-based noise control

Sonexos SA has raised CHF 5 million in a Pre-Series A round led by Valquest Partners, with Bosch Ventures participating, to move its solid-state noise control technology from prototypes into industrial production. The Swiss company is targeting first series production in early 2028 and is expanding into appliance, HVAC and data-centre cooling applications.

Why it matters: - Sonexos is trying to replace bulky passive noise insulation with a thinner, lighter active system for low-frequency sound. - The company’s target markets include appliances, HVAC equipment and data-centre cooling, where noise limits, airflow and product size often conflict. - The new funding is meant to move the technology from lab and pilot work into qualified industrial products.

What happened: - Sonexos SA said it raised CHF 5 million, about EUR 5.4 million or USD 6.1 million, in new equity financing. - Valquest Partners led the Pre-Series A round. - Bosch Ventures, industry angels and private investors also participated. - Fadi Noureddine, founder and managing partner of Valquest Partners, joined the Sonexos board of directors. - The company said the round was announced in Lausanne, Switzerland, on Oct. 21, 2026.

The details: - Sonexos develops patented plasmacoustic technology that absorbs low-frequency noise electronically in a thin panel format. - The company says prototype systems have cut low-frequency noise by up to 20 dB in HVAC systems. - Sonexos also says prototype tests in domestic appliances have reached reductions of up to 16 dB. - The Plasmacoustic Metalayer uses a software-controlled layer of plasma to absorb sound at a surface. - The system has no moving parts and is designed to be thin and lightweight. - The company says its Plasmapanel can absorb sound from 30 Hz to 1,500 Hz depending on installation. - Sonexos says Plasmapanel-based systems need less than a fifth of the space and weight of passive silencers with similar low-frequency performance. - Sonexos is running paid prototype-integration programs with global appliance and HVAC manufacturers. - The company is advancing toward appliance-level design-in. - Its most advanced programs target series production in early 2028, subject to integration, regulatory compliance and new-product introduction. - The financing will support industrialization, customer integration, reliability testing, qualification, regulatory compliance, engineering hiring and broader patent protection. - Sonexos holds an exclusive licence from EPFL for foundational plasmacoustic patents in its field of use. - The company has filed four additional patent families of its own. - Two UK patents have been granted, with applications pending in other major markets.

Between the lines: - Sonexos is betting that active noise control can scale beyond headphones and narrow enclosures into larger products and installations. - The company’s pitch is that software-controlled plasma can solve the low-frequency problem without the bulk that passive acoustic materials usually require. - The involvement of Bosch Ventures and the board seat for Valquest suggest the investors see a path from deep tech to manufacturing scale. - Sonexos is also positioning the technology for AI data-centre cooling, where quieter operation could help operators keep cooling capacity during night-time noise restrictions. - The company says community noise concerns are growing as data-centre infrastructure expands.

What’s next: - Sonexos is continuing customer integration work with appliance and HVAC OEMs. - The company is developing the Plasmapanel Radial Active Silencer for fan discharge applications in data centres. - Sonexos said it announced a collaboration in July 2026 with SIT, an Euronext Milan-listed company, to integrate the technology with fan platforms for data centres, battery energy storage and industrial cooling. - SIT is the first member of the Sonexos Certified Fan Partner Program. - The companies plan to present a first working demonstrator at CES 2027. - Sonexos expects first series production in early 2028 if integration, compliance and product-introduction milestones are met.

The bottom line: - Sonexos has funding, investor backing and pilot traction, but the main test now is turning promising noise-reduction performance into manufacturable products at scale.