Wharfedale Diamond 12.4 Floor-Standing Loudspeaker Will Make You a Believer in High-End Audio: Features 6.5-Inch Drivers and Advanced Crossover

Fueled by a 6.5-inch woofer and 6.5-inch bass/midrange driver, the Wharfedale Diamond 12.4 floor-standing loudspeaker plays with a focus, immediacy, transparency, and openness mostly off-limits to other models anywhere near its price class. Proudly expanding on the Diamond Series heritage originally established more than three decades ago, Wharfedale thoughtfully considered every aspect of Diamond 12 Series and updated practically everything from the ground up on both the inside and outside so that each speaker in the line performs with optimal results. A sophisticated voice coil, precision-based parts, and computer-modeled bracing are just a few of the audiophile-minded advantages that yield natural, richly expressive sound.

Responsible for its fantastic low-end capabilities, Diamond 12.4 features advanced drivers comprised of trademarked Klarity cone material – formulated from a blend of polypropylene and mica to add stiffness while remaining lightweight for low coloration and fast responsiveness. Fitted with a low-damping surround and shaped to achieve a flat response curve, it produces expressive dynamics even on complex material. Each driver also possesses a precision-crafted magnet system with an aluminum compensation ring to minimize the effect of variations in inductance as the voice coil travels, ultimately leading to an absence of distortion and intermodulation generated by the motor system. As for the aforementioned voice coil, it comes wound on an epoxy/glass-fiber bobbin produces higher power handling than those assembled on aluminum machines – and claims a stiffness lacking on Kapton types normally found on speakers at this price level.

When it comes to highs, Diamond 12.4 will take you there. Comprised of woven polyester film with a high-loss coating for open, smoothly extended high frequencies, its one-inch soft-dome tweeter boasts an optimized magnet system and flat front plate to attain wide dispersion and uncompressed playback. Architecturally, a very short duct on the front plate balances the acoustic load and serves to improve SPL measurement. Equally important, Diamond 12.4 utilizes a sophisticated crossover network with LKR 24dB topology and air-core inductors – the latter commonly found in much more expensive high-end designs due to their low-distortion properties.

Sporting a fit and finish intended to instill pride of ownership, Diamond 12.4 takes the elegance of its namesake stone with utmost seriousness. It also benefits form-follows-function architecture in which Intelligent Spot Bracing connects opposite walls with a custom, computer-modeled wood brace to reduce resonance – and not transfer it from side to another. In addition, the rear-ported enclosure works in harmony with the drive unit to produce the sound you deserve to hear.

As the flagship in a series that has literally redefined what's possible from budget-friendly speakers for more than 30 years, Diamond 12.4 will make you a believer in high-end audio and the differences it makes on how – and what – you hear. 

Klarity Equals Focus

New Klarity cone material for the drivers, formulated from a blend of polypropylene and mica, adds stiffness to reduce flexing, enabling a lightweight cone with high rigidity, low coloration, and fast response. The Klarity cone is fitted with a low-damping surround, thereby achieving both low colouration and expressive dynamics. By simulating many different cone shapes and adding ribs to provide further stiffening, a flat response curve was achieved without resorting to a high-damping surround, thereby striking an ideal balance.

Precision-Crafted Magnet System Keeps Driver Moving as a Piston

A precision-made magnet system with an aluminum compensation ring is employed to minimize the effect of variations in inductance as the voice coil travels. This contributes to an absence of distortion and intermodulation generated by the motor system. In addition, the voice coil is wound on a high-power epoxy/glass-fiber bobbin – highly unusual in speakers at this price level. It has the advantage of not adding eddy currents and delivers greater power handling than an aluminum bobbin, whilst also being much stiffer than the Kapton type associated with Diamond 12 Series' price class.

Going High

The one-inch soft-dome tweeter is made from a woven polyester film with a high-loss coating to deliver open and smoothly extended high frequencies. The magnet system and the front plate have been optimized for wide dispersion and uncompressed behaviur. The front plate is flat and exposes the dome as much as possible; only a very short duct on the front plate balances the acoustic load and improves the SPL measurement.

Crossover in Style

The crossover network uses an acoustic LKR 24dB topology. This includes air-core inductors of the type more commonly found in high-end speakers, selected because they produce the lowest distortion of all inductor types. As the resistance of the coil is higher than a standard laminated steel or ferrite core inductor, the magnetic structure of the mid/bass driver has been modified to compensate, resulting in fast, clean bass with no distortion from the inductor.

Firm and Fair

The rear-ported enclosure is precisely sized so that the internal volume works in harmony with the drive unit system to deliver the desired sonic result. A multi-layered sandwich design subdues the identifiable characteristics of the cabinet. Even the resonant properties of the glue between the layers was measured to determine the optimum combination.

Brace Yourself

Inside the cabinet, Intelligent Spot Bracing connects opposite walls with a specific form of wood brace to achieve optimal reduction of cabinet resonance. These braces are precisely modeled by computer simulation to improve upon the commonplace ‘figure of eight' brace, which may simply transfer resonance from one wall to another.