KEF R Series R11 Stereo Pair – Gloss Black


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KEF R Series R11 Stereo Pair £4000- finished in Gloss Black. Award winning stereo speakers incorporating UNI-Q technology that delivers exceptional audio performance.


. . . . . Listen to the amazing sense of depth and clarity at our new store  – please ask for a demonstration  

Flagship three-way floorstander

The largest model in the R Series combines four bass drivers and the latest generation Uni-Q for a powerful and refined sound With hybrid aluminium bass drivers and a 12th generation Uni-Q for mid and treble the mighty R11is extremely capable. Using technology from KEF Reference it delivers clarity, finesse and serious bass.


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.

Shadow Flare
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.

Cabinet Bracing
A solid platform is imperative for great sound. The new R Series benefits from Constrained layer damping. This system utilises internal braces joined by a ‘lossy’ interface and is highly effective at dissipating unwanted vibrations that would otherwise artificially change the sound and music.

Microfibre Grilles
The R Series was created to sound its best with or without grilles. The microfibre grille design is a first for KEF and not only looks beautiful but has a negligible effect on performance. They continue the tone-on-tone approach to match the various cabinet finishes and the edges are burnished for a suede-like effect.

Package components:

  • R11 – Floor Standing Speakers x2 – finished in Gloss Black

Technical Specifications:

Stereo Pair : R11  (x2)

  • Design: Three-way bass reflex
    Driver Units
     Uni-Q Driver Array:
     HF: 25mm (1in.) vented aluminium dome
     MF: 125mm (5in.) aluminium cone
    Bass Driver: LF: 4x 165mm (6.5in.) hybrid aluminium
    Weight: 37.7 kg (83.1 lbs.)
    Dimension (HxWxD): 1249 x 200 x 383.5 mm (49.2 x 7.9 x 15.1 in.) with terminal*
    Dimension (HxWxD): 1295.5 x 310.6 x 383.5 mm (51 x 12.2 x 15.1 in.) with terminal with Plinth*
    Sensitivity:(2.83V/1m): 90dB
    Crossover Frequencies: 400Hz, 2.9kHz
    Frequency Range: 30Hz-50kHz (-6dB)
    Typical In-Room Bass response: 26Hz (-6dB)
    Frequency Response:46Hz-28kHz (±3dB)
    Harmonic Distortion:<0.3% 120Hz-20kHz (90dB, 1m)
    Maximum Output:113dB
    Amplifier Power:15-300W (recommended)
    Nominal Impedance:8Ohms (min.3.2Ohms)
    Finishes:Black Gloss / White Gloss / Walnut
Weight 37.700 kg
Dimensions 383.500 × 200.000 × 1249.000 mm
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