The Projet

de prodiges

Since its origin in 1907, SPENGLER has been inventing and revolutionizing medical diagnosis with the aim of enabling each health professional to be more precise and more efficient in his daily work.
The new stethoscopes PULSE II, MAGISTER II and CARDIOPRESTIGE II are the incarnations of this will or as usual SPENGLER has pushed the limits of medical diagnosis even on a device where any improvement seemed impossible.

The association
of talent!

Several years were needed to be able to make this new stethoscope collection available.

SPENGLER LAB, which groups together our research and development department and other talented engineers, made it possible to combine two exceptional partnerships for this project

The mechanics and acoustics laboratory is the largest European acoustic research laboratory and one of the most prestigious in the world. A major CNRS centre equipped with cutting edge technology which was used for our research.

The prestigious engineering school that trains talented engineers also took part in this project by seconding an engineering student for several months to successfully complete the project.


As we have been manufacturing stethoscopes for several decades, the origin of this project was based on the idea of re-examining all sound wave influencing factors using the acoustic laboratory’s cutting edge technology.

Indeed, inside the chambers that were fully isolated from all external interference, we measured all the possible variants and their results on the acoustic quality in the context of a medical examination between 0 Hertz and 1400 Hertz.

Examples of the studied parts

  • Choice of materials for chestpieces and binaurals: (Aluminium, ZAMAK, steel, Brass),
  • Chestpiece weight and material positioning,
  • Tubing length and width,
  • Binaural curve and width,
  • Receiver machining shape.

Acoustic performances
you will
hear about!

The results of this research have led us to make strategic choices for each type of instrument.
Strong and honoured choices so that you can be more efficient every day.

This is a matrix summarising part of the experiments carried out: we can see the acoustic impacts of the changes that were made (tubing size, tubing diameter…).


These excellent instruments must have very high quality acoustic properties while providing comfort of use and increased versatility for all types of examinations.
This is why we increased the weight of our chestpieces by increasing the steel thickness to favour the capture of the sound waves while improving machining to reduce resonance.
These instruments therefore have uncanny performances over the entire Hertzian range required for a medical examination.


Resolutely exceptional! We have developed exceptional instruments for precise diagnoses.
These stethoscopes have been made heavier to allow the perfect capture of sound waves.
The tubing has been shortened and its diameter increased as has that of the binaurals to improve the sound quality over the entire required Hertzian range.


steam ahead!

As these stethoscopes must mainly provide good performances in the low frequency range, we have optimised the addition of material at the very core of the receiver to sublimate sound wave capture while maintaining a competitive weight thanks to the use of aluminium in their design.
These new stethoscopes therefore have an exceptional weight to acoustic performance ratio and will be the perfect companion for professionals who move around frequently.