The largest model in the R Series, the R11 combines four bass drivers and the latest generation Uni-Q for a powerful & refined sound. With hybrid aluminium bass drivers & a 12th generation Uni-Q for mid & treble the mighty R11 is extremely capable. Using technology from KEF Reference it delivers clarity, finesse and serious bass.
An Eisa award winner
"...a slender speaker capable of a big, rich, room-filling sound packed with detail and delivering superb musical involvement, and with the style to ensure it looks every bit as impressive as it sounds". — EISA Award Committee
The evolution of KEF's Uni-Q driver reaches its 12th generation in the R Series. Using simulation and analysis tools KEF’s engineers have been able to dramatically reduce colouration by cutting resonance in the tiny gaps between Uni-Q’s elements. The result is purer and more precise sound with stronger imaging.
The Shadow Flare is an innovative way to cut harmful high frequency cabinet diffraction. It's a carefully profiled transition that extends the waveguide effect of Uni-Q. The treble escapes naturally because the ‘shadow region’ stops it getting to the cabinet edges. The result is vastly improved fine detail.
Low Frequency Drivers
R Series bass drivers have a two-part structure with a shallow concave aluminium skin atop a paper cone. Combine this stiffness with the cone’s unique geometry and you get near pistonic movement for punch and speed. KEF has also increased linearity in the magnet system which means more impressive and impactful bass.
Flexible Port Technology
When it comes to generating deep, articulate bass, port design is crucial. The R Series ports have innovative flexible walls. Using computational fluid dynamics the flare and profile of each port is calculated to delay the onset of turbulence and the flexible port walls prevent resonances from colouring the midrange.
The R Series
At KEF the Reference Series is the home of cutting-edge technological innovation. This is the result of diligent, creative research and development by the very best engineers in the business. The new R Series benefits from many of the technologies, materials and developments created for the Reference Series.
Feel the music
When you want to forget the world and simply lose yourself in sound, R Series will take you there. At KEF, the quest to develop perfect loudspeakers has lasted more than 50 years. Like you, we don’t just want to hear music; we want to experience it, get inside it and feel part of it.
If you are going for these speakers in a home theatre system, then I highly recommend the R8a Dolby Atmos Surround speakers. They can be placed on top of your R11 speaker to fire up, or wall mounted to fire down.
|Design||Three-way bass reflex|
|Drive units||Uni-Q Driver Array:
HF: 25mm (1in.) vented aluminium dome
MF: 125mm (5in.) aluminium cone
LF: 4 x 165mm (6.5in.) hybrid aluminium
Frequency range (-6dB)
|30Hz - 50kHz
|Frequency response (±3dB)||46Hz - 28kHz|
|Recommended amplifier power||15 - 300W|
|Nominal impedance||8Ω (min.3.2Ω)|
Dimension (H x W x D)
with terminal *
|1249 x 200 x 383.5 mm|
Dimension (H x W x D)
with terminal with Plinth *
|1295.5 x 310.6 x 383.5 mm|
|Finishes||Black Gloss / White Gloss|