KEF BLADE ONE META

The world's first Single Apparent Source speaker, now with 12th generation Uni-Q® with MAT™. A bespoke driver array engineered to deliver pristine performance, and capable of raising Blade to new heights of performance. Featuring four 225mm (9 in.) force-cancelling bass drivers, Blade One Meta is the top model in the Blade series.
 

Now with Metamaterial Absorption Technology

Obsessed with sound quality and committed to bringing a superior listening experience, KEF has been
pioneering innovative acoustic engineering since 1961. In 2009 we gave our engineers free rein to create
a speaker to showcase KEF’s technology leadership and powers of innovation with no preconceptions and
restrictions, they came up with the revolutionary Concept Blade – the world’s first Single Apparent Source
loudspeaker. The concept was further refined and developed for production in 2011, when Blade became
HiFi loudspeakers that serious audiophiles could actually own.

Blade is an attitude. It’s about exploring the art of the possible and pushing boundaries of HiFi sound without
preconceptions which is why the latest version of Blade benefits from our latest acoustic innovations:
Metamaterial Absorption Technology1
(MAT™), a bespoke 12th generation Uni-Q driver array and a host of
other improvements.

The Blade series consists of two models: Blade One Meta and Blade Two Meta. Both sharing the same DNA,
the same technology and the same striking aesthetic, Blade Two Meta is on a slightly smaller scale.

Single Apparent Source Technology

At the heart of Blade lies the Single Apparent Source technology. Single Apparent Source is an extension to
the iconic Uni-Q driver array, the building block of the KEF signature sound. The technology aims to achieve
the acoustic ideal of a point source, where low, mid and high frequencies radiate from one point.

Perfectly calibrated drivers that cover the speaker’s entire bandwidth are configured so all frequencies
appear to radiate from one single point. With Blade, four low-frequency drivers in symmetrically opposing
pairs are tightly packed around a two-way Uni-Q driver where the mid-frequency and high-frequency share
the same acoustic centre.

The result is noticeably more precise imaging and highly accurate sound across a wider area. This is what
makes Blade incredibly coherent across all audible frequencies; what you hear is more real and immersive.

Revolutionary sound absorption with MAT™

A truly revolutionary tool in the KEF acoustic armoury, Metamaterial Absorption Technology (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.

A result of joint development with the Acoustic Metamaterials Group, using MAT breaks completely new
ground in loudspeaker design, and once again demonstrates KEF’s unrelenting passion for developing new
technologies to improve your listening experience. 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.

12th Generation Uni-Q with MAT™ delivers

The 12th generation Uni-Q with MAT for Blade is a bespoke driver array engineered to deliver pristine
performance on our flagship loudspeaker. 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 Blade’s sensational performance.

For starters, the new stiffened aluminium tweeter dome that sits at the centre of the state-of-the-art Uni-Q
driver array is capable of delivering consistently sweet, lucid and lyrical treble, irrespective of the volume.
KEF engineers re-engineered the tweeter gap damper to maximise the space at the back of the tweeter for
the new metamaterial absorber. Optimising the cavity shape and strategically placing two rings of porous
material effectively tame the resonances and imperfections, thus greatly improving detail and clarity.
BLADE

Summary of features

• Single Apparent Source technology revolutionises
the orientation of the low, mid, and high
frequency drivers to deliver sound you hear to be
more real and immersive
• Metamaterial Absorption Technology eliminates
99% of high-frequency distortion for pure, natural
sound
• Bespoke 12th generation Uni-Q with MAT driver
array for exceptional acoustic accuracy
• Two pairs of force-cancelling LF drivers deliver
clean, massively extended bass
• Enhanced crossover design fine-tuned the signal
path for maximum clarity
• Optimised cabinet design for best acoustic
performance
• Two models: Blade One Meta, Blade Two Meta
• Available in eight finishes
• Customised finishes are available upon request

A new 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 Uni-Q driver array is fully decoupled to prevent unwanted vibrations from muddying the sound. A
new flexible decoupling chassis is designed to reduce vibration and remove coloration. It ensures that any
vibration generated by the mid and high-frequency motor system is not transmitted to the loudspeaker
cabinet.

A new driver surround is designed to allow longer excursion without causing diffraction and extending
the frequency range of the mid-frequency. Plus, the contours of the dome, midrange horn and surround
are all computer-optimised to ensure a perfectly smooth transition to the cabinet. The patented tangerine
waveguide technology manages the airflow to recreate the wide, even spread of a natural sound field,
dispersing the astonishingly pure high-frequency imaging throughout the room.

The result of these innovations and developments is that this bespoke 12th generation Uni-Q with MAT
offers a sound that is more transparent and life-like than previously possible.

Powerful, articulate bass

Blade’s four powerful vented low frequency drivers are perfectly integrated with the 12th generation Uni-Q
with MAT to deliver clean, massively extended immaculately controlled bass. In line with the purity of the
original Blade concept, decoupling the voice coil from the diaphragm allows low order crossovers to be used,
for purer, silkier bass response. To avoid exciting the cabinet when playing loud, these drivers are mounted
back-to-back to cancel out kinetic forces that might otherwise colour the output, and each pair occupies a
separate chamber to reduce the need for damping.
In the latest Blade, the crossover design has been enhanced to fine-tune the signal path for maximum clarity.
Plus, two pairs of audiophile-quality WBT connectors allow bi-wiring or bi-amping for lossless transmission.

Performance by design

Blade’s sculptural design is dictated by acoustics. Tapering gracefully from top to bottom and from front to
rear, the gentle front radius presents no discontinuity to mar sound clarity. Made from an ultra-high density
polyurethane composite, the acoustically inert cabinets’ complex parabolic curves are cleverly engineered to
eliminate standing waves that might blur the sound.

Asserting the sophistication of the technology they contain, these stunning speakers are available in a
palette of eight finishes, created by blending five cabinet finishes with six driver cone colours: Piano Black/
Copper, Piano Black/Grey, Frosted Blue/Blue, Frosted Blue/Bronze, Charcoal Grey/Red, Charcoal Grey/
Bronze, Racing Red/Grey, and Arctic White/Champagne. If that isn’t enough, customers can also create their
own customised speaker cabinet colour scheme by supplying a Pantone of their choice, for a truly unique
Blade.

With the philosophy of innovating in pursuit of the most accurate and realistic sound, Blade is about
perfecting a groundbreaking concept to delight people with the ultimate listening experience.