Performance Redefined: R Series – Now With MAT

Since 1961, KEF has strived to reproduce pure sound precisely as it was meant to be heard. Decades of experience in acoustic innovation and the quest for music perfection come together in the R Series to deliver sound with more detail and deeper insight, sound that ignites excitement every time you experience it.

The R Series is a direct beneficiary of the technological innovations developed for The Reference, the class-leading series that continually set the benchmark for loudspeakers and sound reproduction. Combining with bespoke technologies, the R Series delivers an exceptional acoustic performance. The revolutionary Metamaterial Absorption Technology (MAT) has been incorporated into the latest iteration of the R Series, and the 12th generation Uni-Q driver array has been refined to maximize the impact of this technological advance and ensure the best possible performance.

When we immerse ourselves in music, we don’t just listen to it but feel it. Then it has the power to alter our moods, to move our souls, and can be one of the greatest pleasures in life. This feeling is the driving force behind KEF’s quest to develop the ultimate loudspeaker – a goal that they have spent more than six decades in pursuit of.

You may have listened to your favorite music a thousand times or more, but through the R Series you will discover a depth and level of detail in any recording that will likely make you love it more – from the scrape of plectrum on guitar string, the changes of vibrato in a voice, to the sense of emotion and atmosphere in a live performance. KEF developed the R Series for those who share their obsession with music perfection - pure and natural sound as it is meant to be heard.

The result of this pursuit is an exceptional seven-model range of loudspeakers capable of fulfilling both stereo and home theater duties with exquisite detail and incredible insight.

• 3 Floorstanding speakers
• 1 Standmount speaker
• 2 LCR speakers
• 1 Up-firing Dolby Atmos/wall-mountable speaker

Revolutionary Sound Absorption With MAT

At the heart of the latest R Series is Metamaterial Absorption Technology (MAT), a revolutionary innovation that takes the performance of the 12th generation Uni-Q driver array to another level in terms of accuracy and clarity.

MAT is a highly complex maze-like structure, where each of the intricate channels efficiently absorbs a specific frequency. When combined, the channels act as an acoustic black hole, absorbing 99% of the unwanted sound that comes from the rear of the tweeter, eliminating the resulting distortion and providing a purer, more natural acoustic performance.

Metamaterials are specially developed structures that use existing materials in such a way that they exhibit new, desirable properties that are simply not found in naturally occurring substances.

A result of joint development with the Acoustic Metamaterials Group, using MAT breaks completely new ground in loudspeaker design, and demonstrates KEF’s unrelenting passion for innovation and dedication to improving the listening experience for everyone.

Superior KEF Sound

The building block of KEF signature sound, Uni-Q technology disperses sound more evenly throughout the room. By placing the tweeter precisely at the acoustic center of the bass/midrange cone, both act together as a single point source, eliminating the limited ‘sweet spot’ and instead allowing everybody, no matter where in the room they are sitting, to experience and enjoy the same natural, detailed sound.

A bespoke 12th generation Uni-Q driver array with MAT is found in all seven models of the R Series and delivers an incredibly detailed performance. It’s the result of decades of accumulated in-house knowledge and the application of cutting-edge simulation and analysis tools. The developments are many and all play a part in R Series’ exceptional performance.

The Uni-Q driver array has been redesigned to maximize the performance improvements that MAT delivers. The conical waveguide that couples the tweeter dome to the new metamaterial absorber has been specially designed for the bespoke driver based on its depth. The re-engineered tweeter gap damper strategically places two rings of porous material to tame the resonances and imperfections effectively, thus greatly improving detail and clarity.

The ultra-low distortion midrange motor design uses a copper ring embedded into the motor gap to minimise inductance and variation of inductance with coil position. This lowers the midrange THD and reduces thermal compression, leading to improved efficiency.

The Flexible Decoupling Chassis first used on the latest Blade and The Reference loudspeakers is employed on the Uni-Q driver array to dramatically reduce coloration of the sound caused by midrange vibration transmission to the cabinet, while also solving the problem of additional sound created by the driver basket that occurs with traditional decoupling methods. It works by decoupling the massive midrange motor from the Uni-Q chassis, dissipating its vibration before it can travel to the cabinet and be radiated as unwanted sound.

The surround on the 12th generation Uni-Q driver array allows for longer excursion without causing diffraction and extending the frequency range of the midrange. The contours of tweeter dome, midrange cone and surround are all computer-optimized to ensure a perfectly smooth transition to the cabinet.

These innovations combine to ensure the R Series sound even more transparent and life-like than previously heard on this already exceptional range.

Shadow Flare For Improved Clarity

Shadow Flare is another feature originally designed for The Reference. It reduces harmful cabinet diffraction, allowing the 12th generation Uni-Q with MAT to work to its highest potential. Shadow Flare is a precision designed surface that extends the waveguide effect of the Uni-Q driver array. This means the tweeter no longer has line of sight of the cabinet edges, creating a ‘shadow region’ at the points where the potential for diffraction is highest, minimizing the acoustic impact to negligible levels. The result is improved clarity and the reproduction of the fine details that make listening such a thrilling experience. The subtle nuances of plucked strings, the changes of vibrato in a voice, all of these are clearer on the R Series.

Performance Critical Damping

Powerful drivers can easily cause the cabinet walls to make noise of their own - noise that was never in the recording in the first place. Working alongside the bespoke internal bracing layout, KEF’s Constrained Layer Damping is a sophisticated bracing system that ensures the cabinet stays inert by connecting the bracing to the drivers and cabinet by a lossy interface. This material converts vibration into heat, ensuring that the cabinet makes the only sound it needs to - the sound of silence.

Consistent Voicing

As with all KEF speakers, the R Series Meta has been given a neutral voicing. This allows R Series Meta to be paired with other KEF speaker ranges (traditional box or Architectural) within a home theater system, or to create a consistent sound throughout multiple zones in a whole home audio system.

Dedicated Microfiber Grilles

The R Series is engineered to perform its best with or without grilles. The dedicated microfiber grilles are crafted from multiple layers of material and the edges are burnished for a suede-like feel.

With 1801 precision-cut holes for each driver you experience fantastic performance even when the drivers are covered, which is great news if you feel the need to protect them. The magnetic fixings provide a secure and precise fit, in keeping with the clean styling of the R Series.

Features

• Metamaterial Absorption Technology (MAT) eliminates 99% of high-frequency distortion for pure, natural sound
• Bespoke 12th generation Uni-Q with MAT driver array for exceptional acoustic accuracy
• Refined tweeter gap damper tames resonances for improved detail
• Flexible Decoupling Chassis prevents unwanted vibrations for better clarity
• Enhanced crossover design and fine-tuned the signal path for pristine, clean sound
• Microfiber grilles offer the perfect balance between driver protection, sonic performance and aesthetics