Review: Bowers & Wilkins 800 Series Diamond D4


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Bowers & Wilkins Adds The D4 to its 800 Diamond Series

Bowers & Wilkins started with one man, John Bowers, assembling speaker systems in his electronics shop in Worthing, South East England back in the 1960's. It was when he received an inheritance from a satisfied customer that he was able to launch a loudspeaker company. Since then, Bowers & Wilkins (or "B&W" to us audio geeks) has been at the forefront of high-performance audio technology and design concepts with their "Tweeter-on-Top" and the reference speaker of choice for many of the world’s leading recording studios (Hello Abbey Road Studios and Skywalker Ranch). And now, well over 50 years later, Bowers & Wilkins continues to delight fans and customers by delivering a new series to their iconic Diamond range: The D4.

Here's a taste of what's to come from the Bowers & Wikins product team:

The new 800 Series Diamond range continues to feature seven models, beginning with the two-way 805 D4 stand-mount speaker. That’s joined by a series of three-way floorstanding models, including the 804 D4, 803 D4 and 802 D4. For the flagship model in the range, Bowers & Wilkins is pleased to reintroduce an iconic name to its portfolio, with the launch of 801 D4 to replace the existing 800 D3. For home theatre use, the HTM81 D4 and HTM82 D4 provide a pair of high-performance centre channel speakers to complete the range. Every new model in the range combines hundreds of detail improvements plus several entirely new technologies to create the most transparent, detailed and natural-sounding series of loudspeakers Bowers & Wilkins has ever produced.

Refined Design

The new Bowers & Wilkins D4 range introduces a fourth finish to the line-up adding a Satin Walnut finish to the existing selection of Gloss Black, White and Satin Rosenut. Every stereo model in the range also boasts an upgraded cabinet design with an all-new rigid, cast aluminum top section to replace the previous wooden version. According to B&W, this offers greater stiffness to improve cabinet quietness.

The profile of the new aluminum top is finished in ‘Leather by Connolly’ black for dark cabinets (Black, Satin Rosenut) and light grey for lighter finishes (White, Satin Walnut). Every model in the range adopts a revised version of the iconic Solid Body Tweeter-on-Top housing, with a new, elongated tube-loading system to produce an even more open sound for high frequencies. This more stiff enclosure resists unwanted resonance more effectively than ever, especially when combined with the new two-point decoupling system that isolates it from the rest of the loudspeaker. As before, the Solid Body Tweeter is milled from a single solid block of aluminum and now, it uses an anodized finish, either dark or light depending on the cabinet color, to celebrate that fact.

The D4 range also introduces three entirely new cabinet forms. The 805 D4 and 804 D4 stereo models adopt the reverse-wrap cabinet design first introduced in 2015 for the larger speakers in the series. This new form reduces the profile of each cabinet’s front baffle while dramatically increasing the overall rigidity of the complete system. It also allows crossovers to now be mounted in dedicated spaces on the rear of each speaker, housed behind the rigid aluminum spines. The 804 D4 builds on the potential of its new configuration by adding a downward-firing port with an integral aluminum plinth – again, much like the form used by the larger floorstanding speakers in the range. Alongside the 805 D4 and 804 D4, the all-new HTM82 D4 center speaker adopts the reverse-wrap cabinet form of its siblings, for superior acoustic and mechanical performance.

800 Series Diamond D4 Walnut Finish
800 Series Diamond D4 Walnut Finish
Diamond Series D4 Speakers - White
Diamond Series D4 Speakers - Black

New Technologies: Continuum™ Cone, FST & Biomimetic Suspension

The result of an eight-year research program, the composite Continuum Cone – used for both midrange and mid/bass applications – is already famed for its open, transparent, and neutral performance. When used as a midrange drive unit in Bowers & Wilkins floorstanding speakers, it is always combined with our Fixed Suspension Transducer (FST) midrange technology, which carefully avoids the coloration that traditional cone surrounds can introduce.

Now, Bowers & Wilkins has combined the twin benefits of Continuum and FST with an all-new advance that transforms the other key element of a drive unit’s normal operation: the fabric spider. Over decades of continuous development to nearly all areas of speaker design, the fabric spider, a key element in the suspension of every conventional loudspeaker drive unit, has remained largely unchanged – until now.

Bowers & Wilkins' all-new composite Biomimetic Suspension replaces the conventional fabric spider with a minimalist composite suspension system that revolutionizes midrange cone performance by greatly reducing unwanted air pressure – aka sound – that a conventional fabric spider can generate, removing its unpredictable, non-linear effects. The result is unprecedented midrange transparency and realism.

Decoupled Midrange and Turbine™ Head

Bowers & Wilkins combines all the performance-enhancing benefits of its Continuum Cone, FST midrange technology and Biomimetic Suspension with careful isolation of the complete midrange assembly from the rest of the surrounding cabinet. In all three-way models, midrange drive units include a highly stiff all-aluminum chassis featuring Tuned Mass Dampers (TMD) to quieten any resonance. These complete drive units and motor systems are then isolated on sprung-mounted decoupling mounts, further restricting the flow of vibration into the assembly.

Finally, 803 D4, 802 D4 and 801 D4 include the massively stiff all-aluminum Turbine Head enclosure for their midrange drive units, providing not only an outstanding acoustic form but also even better isolation – since the head assembly is itself further decoupled from the bass enclosure below.

The HTM81 D4 and HTM82 D4 introduce a new and similar concept but inside their cabinets: each center-channel model now features an internal aluminum enclosure that provides a stiff, well-isolated housing for the midrange drive unit and its decoupling mechanism.

800 Series Diamond D4 Tweeter
800 Series Diamond D4 Tweeter

Solid Body Tweeter

To minimize the unwanted transfer of resonance into each model’s Diamond Dome tweeters, an exceptionally stiff enclosure is required. The new 800 Series Diamond introduces a revised version of the iconic Solid Body Tweeter housing; this continues to be machined from a solid piece of aluminum, but now it features an elongated form (almost 30cm/12in long) with a longer internal tube-loading system.

The new Solid Body Tweeter assembly is now decoupled from the speaker body or Turbine Head (depending on model) in two locations rather than one: this notably improves spaciousness and openness. At the same time, the tweeter’s motor assembly has been re-engineered to allow the drive unit to ‘breathe’ more effectively with no loss of performance. The result is a notable reduction in the resonant frequency behind the tweeter dome.

Reverse-Wrap Cabinet and Matrix™

Matrix has been a core Bowers & Wilkins technology for more than 30 years and has also been continually developed throughout that time. An internal structure of interlocking panels that brace the loudspeaker internally in all directions, Matrix helps to make speaker cabinets rigid, inert and quiet.

The 805 D4 and 804 D4 now feature the reverse wrap speaker cabinet previously reserved for the larger floor-standing 800 Series Diamond models. Each model now has a stiff aluminum plate on the inside face of its cabinet, bracing its baffle against resonance. Inside, both models also feature updates to their Matrix bracing, with thicker panels made from solid plywood rather than the previous MDF, reinforced by aluminum bracing sections.

Every stereo model in the range also features the new cast aluminum top replacing the previous wooden design, dramatically increasing the rigidity of the speaker enclosure. As before, drive units are housed in stiff aluminum pods mounted to the baffle of the speaker while crossover units are fitted to equally stiff aluminum spines running up the rear of the cabinet. Finally, 801 D4 introduces a steel plate in its base section around the port – again, all in the name of adding stiffness to the enclosure and further quietening its operation.

Aluminum Plinth

The 804 D4 now joins the other floor-standing models in the 800 Series Diamond range by offering a downwards-firing Flowport bass port, exiting on to a new, stiffer solid aluminum plinth complete with a constrained layer steel damping sheet designed to offer a rock-solid foundation and to control unwanted resonance. The 804 D4 also has greatly upgraded spikes and feet, with huge M12 spikes that are both more stable and stiffer than the outgoing M6 designs.

803 D4, 802 D4 and 801 D4 use the same arrangement of downwards-firing Flowport, solid aluminum plinth and constrained layer steel damping, but retain the wheel-plus-spike configuration introduced in 2015, making each model far easier to maneuver to the perfect listening position than any rival design.

Aerofoil™ Cone

The result of advance computer modelling, the Aerofoil Cone is a composite bass cone with a varying thickness designed to offer maximum stiffness where it is most needed while preserving a low mass – thanks to its carbon-fiber skin and light syntactic foam core.

Alongside revised and optimized motor systems, each floorstanding speaker in the 800 Series Diamond range now combines its Aerofoil Cones with a new foam Anti-Resonance Plug, which gently braces the voice coil and lowers distortion as the cone moves through its operating range, ensuring even cleaner bass. Together, all these advances deliver unprecedented performance. Available globally from September 1st, the new 800 Series Diamond is the finest range of loudspeakers Bowers & Wilkins has ever created.

Contact one of our showrooms to schedule your own private listening experience of the Bowers & Wilkins D4 Diamond Series speakers.


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