The 683 S2 features a Decoupled Double Dome tweeter - technology evolved from Bowers & Wilkins CM10 speaker. The double dome design uses an extremely thin aluminium dome for lightness, surrounded by a thicker aluminium ring for rigidity. The result is a far more precise treble performance. And while the tweeter looks like it’s part of the main speaker, it’s physically separated in its own gel-filled cavity, so performance isn’t hit by unwanted resonances or vibrations, for a more natural, spacious sound. The 683 S2 also features a bass driver construction method which uses a similar method of bracing to the tweeter with twin layers of aluminium. The 683 S2 also boasts an FST Kevlar midrange driver.