Advanced driver technology The 0.4mm thick, 18cm Esotec+ woofer is made from MSP (Magnesium Silicate Polymer), a proprietary material that we've been using in our speaker cones for decades. It provides the perfect balance of lightness, stiffness and damping that, combined with its new strontium carbonate Ferrite+ ceramic magnet system, reproduces midrange and bass frequencies in perfect balance. - The all-new Cerotar tweeter The tweeter is brand new. It's called Cerotar, and is based on key technologies from our award-winning Esotar Forty anniversary tweeter and the mighty new Esotar3, which you'll find in the top-of-the-line Confidence series. Like all our other tweeters, it's a 28mm unit and uses a precision-coated soft dome. This coating is applied in exactly the correct places and thicknesses to optimise high-frequency performance - it's a process derived from the development of our most exclusive speakers. G Telepon Chat