Description
Now with Metamaterial Absorption Technology
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 Technology1 (MATTM) has been incorporated into the latest iteration of the R Series,
and the 12th generation Uni-Q® driver array has been refined to maximise the impact of this technological
advance and ensure the best possible performance.
The result is an exceptional seven-model range of loudspeakers, engineered to deliver with exquisite detail
and incredible insight. Whether your taste lies with traditional two-channel HiFi, multi-channel home theatre
or both, the R Series reveals levels of detail that must be heard to be believed.
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.
Superior KEF 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 maximise 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.
SPECIFICATIONS
Design
Three-way bass reflex
Frequency Response
(±3dB)
48 Hz – 28 kHz (±3db)
Frequency Range
(-6dB)
33 Hz – 50 kHz (-6db)
Typical In-Room Bass Response
27 Hz (-6db)
Sensitivity
88 dB (2.83v/1m)
Nominal Impedance
4 Ω (min. 3.2 Ω)
Maximum SPL Measured at 1m
111 dB dB
Total Harmonic Distortion (THD)
(90dB, 1m)
<1% 76 Hz and above
<0.5% 110 Hz – 20 kHz
Drive Units
Uni-Q Driver Array:
HF: 25 mm (1 in.) vented aluminium dome with MAT
MF: 125 mm (5 in.) aluminium cone
Bass Unit:
LF: 2 x 165 mm (6.5 in.) hybrid aluminium cone
Crossover Frequency
400 Hz, 2.4 kHz
Recommended Amplifier Power
15 – 250W
Dimension (H x W x D)
1109 mm x 311 mm x 384 mm (43.7 in. x 12.2 in. x 15.1 in.)
Weight
29.3 kg (64.6 lbs)
Dimension: With Terminal With Plinth *
Dimension (H X W X D) With Terminal *: 1062 x 200 x 384 mm (41.8 x 7.9 x 15.1 in.)
* Measurement per unit
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