Focal brand’s signature product, the inverted dome tweeter has been continually developed ever since it was created. It bears repeating that its main advantage, apart from its very low directivity, lies in its use of a coil of small diameter (hence very light and better accelerating) directly fixed to the rigid dome.
Just as with the cones of its bass and midrange speaker drivers, what makes Focal unique is working directly on the sound output and, therefore, on the mechanical characteristics of materials. When we introduced the pure Beryllium inverted dome tweeter ten or so years ago, we clearly demonstrated the decisive advantage of this exclusive technology.
For the TNF tweeter, we have brought two major evolutions to our aluminium/magnesium tweeter. The suspension between the dome and its bracket uses Poron, a material with shape memory.
This suspension method is directly derived from the famous Utopia Beryllium tweeter, making it possible to reduce distortion by a factor of three in the 2-3 kHz range, where the human ear has very great sensitivity.
Distortion levels directly affect sound quality. The use of Poron has reduced the distortion by half in the tweeter’s. Bandwidth between 2–4 kHz: an area where the sensibility of the ear is very high.
The inverted dome’s spatial characteristics and very low directivity already make it greatly superior to the conventional domes used by our competitors and to further improve this a wave guide has been developed. In a horizontal plane, its frequency response has a variance of +/- 0.5 dB. This performance guarantees an incredibly stable sound stage which makes the listening position much less critical.
It is due to more than twenty years dogged work on our manufacturing processes that it is possible to achieve such precision in a component as delicate as a tweeter.
Control over production is the one and only solution for continued innovation when it comes to loudspeakers...
Cross-section of the TNF tweeter. Poron’s physical properties provide improved control over the mobile assembly in the magnetic parts.