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Personal Tech September 1, pm. By Cam Vigliotta. The new cabinet wrap features thicker plywood and bracing to improve rigidity. More Like This. It also allows crossovers to now be mounted in dedicated spaces on the rear of each speaker, housed behind the rigid aluminum spines. The D4 builds on the potential of its new configuration by adding a downward-firing port with an integral aluminum plinth , much like the form used by the larger floorstanding speakers in the range.
In all three-way models, midrange drive units include a highly stiff all-aluminum chassis featuring Tuned Mass Dampers TMD to help quiet any resonance. These complete drive units and motor systems are then isolated on spring-mounted decoupling mounts, which should further restrict the flow of vibration into the assembly. The Floorstanding D4, D4 and D4 include the stiff all-aluminum Turbine Head enclosures for their midrange drive units.
Each floorstanding speaker combines its Aerofoil Cones with a new foam Anti-Resonance Plug, which is designed to gently brace the voice coil to lower distortion as the cone moves through its operating range for cleaner bass. The center channel 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.
The new line of Diamond speakers from Bowers and Wilkins will be available globally from September 1st, In addition, all floorstanding models offer a downfacing bass port that fires onto a new aluminum plinth with a constrained-layer steel damping sheet that better controls unwanted resonances. The iconic tweeter-on-top features a new, more elongated, tube-loaded enclosure milled from a single block of solid aluminum that is decoupled from the rest of the speaker in two locations rather than one.
Also, the smaller D4 and D4 now sport the reverse-wrap cabinet that previously graced only the larger models. This reduces the profile of the front baffle while increasing the rigidity of the entire cabinet. Both drivers are mounted outside the cabinet in the top three floorstandng models, while the tweeter is mounted outside across the board.
One of the most innovative improvements is found on the inside. Called the Biomimetic Suspension, it replaces the fabric spider with a minimalist skeleton that virtually eliminates unwanted sound waves that a conventional spider can generate, removing its unpredictable, non-linear effects.
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