Designed by German luthier Dieter Hopf and made in collaboration with Spanish maker Manuel Adalid, this is an innovative instrument that features a unique, "membrane" top - there is a large oval shaped section of the soundboard which encircles the bridge and is thinner than the rest of the surrounding top. This area is braced with a lightweight lattice system topped with carbon fiber. Indeed this area of the top acts as a separate, highly flexible membrane, increasing volume noticeably as a result. It has a very thick, full-bodied quality of sound with even and balanced notes between all registers. Playability is also very easy, and the neck is reinforced which allows for a more accurate setup. Features 20th fret to accomodate repertoire requiring the high c natural. The guitar is in virtually new/near-mint and concert-ready condition.