The Bowers & Wilkins 805 D4 Bookshelf speaker features include:

Diamond dome tweeter: One of our most significant accomplishments over the past two decades, the ultra-stiff, supremely accurate Diamond dome tweeter is the perfect combination of low mass, exceptional stiffness and outstanding accuracy. 15 years after we introduced it, we haven’t found a better tweeter dome technology.

Solid Body Tweeter: assembly enhances sound quality by utilizing an elongated tube-loading system within a carefully decoupled, single-piece aluminum housing.

Rear-mounted crossover: new reverse-wrap orientation, allows sensitive crossover components to be placed in a dedicated space within the cabinet, providing critical benefits to both performance and serviceability, while also featuring upgraded speaker terminals.