Innovation for effective noise control

Specialised acoustic engineers

Extensive measurement equipment

Analysis and simulation software

35 years of experience

Acoustician measuring sound from two heat pumps on a flat roof; the sound level meter stands on a tripod, the laptop on the parapet.

Applications

Two people performing an acoustic measurement in an open industrial plant; the measurement microphone and machinery are in the foreground.

Industrial noise control

Reduce noise in the workplace and neighbourhood, and detect machinery damage early (predictive maintenance).

Heat pump inside a soundproofing enclosure during an eight-channel sound power measurement; the measuring microphones are mounted in a custom-made wooden frame.

Heat pump & building services noise

For manufacturers, planners, installers, owners and people affected by noise.

Acoustic camera in front of an open panel saw; the superimposed false-colour image locates the sound at the saw blade.

Develop low-noise machinery

Identify acoustic risks early and assure quality through to series production.

Several measurement microphones and a handheld meter during an acoustic measurement in a bedroom.

Noise at home & sleep disturbance

Record recurring noise, identify its cause and find the right solution.

Floor plan of a residential building with room labels and dimensions.

Building acoustics & environmental noise

Identify acoustic risks early: from site selection and approval to acceptance and operation.

Floor-standing loudspeaker in a light wooden cabinet, with four drivers on a black baffle and bass reflex ports in the side.

Room acoustics & audio systems

Plan and optimise rooms and audio systems together for studios, hi-fi, home cinema, clubs and residential construction.

Selected clients

How can we help?

I don't know where the noise comes from I'm building and want to prevent noise problems I need acoustics consultancy I need a written report Our project process

Services

Acoustician measuring sound from a ventilation system on a roof.

Acoustic measurements & analysis

On-site measurements, troubleshooting, signal analysis and identification of unknown sound and vibration sources.

Three-dimensional building model of a residential area, the basis for a noise propagation calculation.

Planning, calculations & simulations

Noise predictions, propagation calculations and acoustic simulations for the planning phase.

Construction plan with handwritten notes on a table, beside a measurement log, pen and sound level meter.

Acoustic consultancy

Independent advice — for unresolved noise problems and during the concept phase.

Site plan of a housing development with the assessed noise levels calculated at individual points.

Expert reports & compliance assessments

Expert reports and compliance documentation (SIA 181, LSV) for authorities and clients, work-station emission levels (EN ISO 11202), machinery noise (MaLV or Directive 2000/14/EC, as applicable)

Long-term measurement instrument with power supply, memory card and measurement microphone on a small tripod.

Long-term noise monitoring

Continuous noise monitoring over days and weeks, using our own instruments to capture sounds that come and go.

Products

Custom control and measurement electronics with multiple cable connections on technical equipment.

Active noise control systems

Active Noise Control (anti-noise) for low-frequency sound — tested on actual equipment and implemented for the specific application.

Machine in a soundproof cabin — before-and-after comparison.

Noise-control cabins

Custom soundproof cabins for smaller machines and modular acoustic enclosures for larger installations.

NoiseMasker

Selectively mask residual unwanted noise — for restful sleep and concentration.

Acoustic test bench with reverberation chamber, measurement channel and analysis station.

Test benches & acoustic quality control

Custom test benches for acoustic quality control in development or series production.

Measurement equipment

Selected microphones, calibrators and front ends for reliable measurements.

miniDSP signal processor with measurement laptop in a hi-fi setup.

Electronics

miniDSP signal processors for hi-fi, studios and home cinema.

We are Sonotronex

Stefan Rüegsegger

Electrical Engineer ETH / Acoustician SGA

Calculation, simulation, concept development, measurement and expert assessment: embedded systems, Active Noise Control, acoustics software and test benches. Main point of contact, Chair of the Board of Directors.

Has been building his own PA and hi-fi loudspeakers with his brother since childhood, for family and friends. Studied electrical engineering at ETH Zurich, specialising in acoustics under Prof. E. J. Rathe. This was followed by thirteen years in signal processing and embedded systems at Siemens Switzerland, then nine years in engineering, expert reports and technical noise control at Vibraplast Akustik.

Niels Mortensen

Physics engineer, EPFL

Measurement, analysis, interpretation and innovative development: measurement campaigns, signal processing, embedded systems programming as well as full-stack development for web app projects and in-house software tools.

Has been building his own room-acoustic treatments since he was young and is a passionate music lover. Studied applied physics at EPFL, specialising in acoustics under Dr Hervé Lissek; completed his master's thesis as an internship at Sony in Stuttgart. Native French speaker; also speaks English and German.

Barbara Giezendanner Rüegsegger

Organisation manager with Swiss federal diploma

Back office, finance and client support — keeps projects, schedules and processes coordinated. Member of the Board of Directors.

Ten years at Swiss Post reorganising the post-office network and managing post offices; self-employed since then.