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Sound engineers
New Models

Sound engineers

Tuesday, 22 March 2016
By The FHH Journal editors
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The FHH Journal editors

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2 min read

Breguet took a revolutionary approach and designed the Tradition Répétition Minutes Tourbillon 7087 entirely around the sound it wanted to produce. The result is a minute repeater whose chimes ring out with unprecedented purity and tone.

Representing much more than a Grande Complication model, the Tradition Répétition Minutes Tourbillon 7087 is a collection of innovations. To create this exceptional watch, Breguet’s engineers devoted themselves first and foremost to scientific research and only subsequently addressed the issue of the components required for sound production. Using specially developed sound generators, they experimented with more than 200,000 combinations of frequencies, which they then classified into categories according to psychoacoustic criteria. The sounds were listened to and evaluated so as to determine the combination of notes that best met the development objectives. The choice made after this selection process then guided the development and the construction of the model. This unprecedented approach, along with an understanding and mastery of the parameters involved in sound production, determined the choice of every aspect of the timepiece, from the innovations that were to be integrated through to the choice of components. The Tradition Répétition Minutes Tourbillon can pride itself on six new patents and five major new innovative elements never previously seen in a wristwatch repetition mechanism.
Like the Classique La Musicale 7800 model, this new Tradition 7087 features an acoustic chamber built into the case – technically termed a Heimholz cavity – whose role is to increase the sound level of the minute repeater while filtering the sounds from the mechanism. This chamber can be glimpsed through eight small holes arrayed on the lower bezel encircling the caseback. It is shaped for the resonant frequencies of the desired sounds. In this model the cavity is rectangular in profile and encircles the movement, from which it is separated by a membrane designed to seal the movement from the outside air. Contrary to the 7800 model that featured a metallic glass membrane, this one is made of gold and affixed to a sapphire crystal providing a stunning view of the movement.

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