Membrane shape and materials are essential. For the finest treble, our engineers have patented the inverted dome tweeter, a Focal signature. The inverted dome shape offers the advantage of low directionality and a small-diameter, lightweight coil for better acceleration. As for the materials used, they combine the key points of a good loudspeaker: aluminum increases dome rigidity and reduces distortion, while the addition of magnesium provides excellent damping. The surround that connects the dome to its support uses Poron, a shape-memory material. This surround is derived from the famous Utopia Beryllium tweeter, and reduces distortion by a factor of three between 2000 Hz and 3000 Hz, where the ear is most sensitive.

Exclusive to Focal and made in France, the Slatefiber membrane is made from recycled carbon fiber and thermoplastic polymer. In their quest for perfection and as specialists in loudspeaker membranes, our engineers have chosen to use non-woven carbon fibers in this case.es in the same direction to achieve even greater rigidity, damping and lightness, the "essentials" of a good loudspeaker. Renowned for its dynamic, rich and balanced sound reproduction, this membrane has proved its worth on numerous products for the home, for professionals in recording studios, and also for listening in the car.