₦11,347,000.00

KEF R11

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 R11 is extremely capable.

Using technology from KEF Reference it delivers clarity, finesse and serious bass.

KEY FEATURES

  • 1″ aluminum tweeter

          Offers crisp high frequencies.

  • 3-way speaker system

          Sounds like 1 source rather than several separate sources.

  • Gloss black finish

          Offers a stylish look to complement your existing décor.

  • Removable grille

          Remains acoustically transparent while protecting the speaker’s components.

  • Bass reflex enclosure

          With a rear-firing port promotes optimal performance.

  • 30Hz – 50kHz frequency response

          Ensures a wide range of accurately reproduced sound.

  • 90dB sensitivity

          Ensures crisp, robust audio.

  • 8 ohms nominal impedance

          Ensures efficient conduction of power through the speaker.

UNI-Q

Placing the tweeter in the acoustic centre of the midrange cone brings the acoustic ideal of a single point source closer to realisation. The new R Series benefits from a new 12th generation incarnation of Uni-Q which has been extensively designed using KEF's in-house simulation and analysis tools. KEF's engineers have been able to dramatically reduce colouration through reducing resonance in the minute gaps between Uni-Q's separate elements. The resulting sound is purer, more precise and makes stereo imaging far more believable.

Shadow Flare

Derived directly from the Reference series, the Shadow Flare is an innovative method of reducing harmful cabinet diffraction for delicate high-frequencies. Shadow Flare is a carefully profiled transition surface which extends the waveguide effect of Uni-Q. 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. The result is vastly improved fine detail, particularly when it comes to the subtle nuances of plucked strings and other percussive sounds.

Low frequency driver

Bass is the very foundation of music; everything is built upon it and maximising bass performance is a vital building block towards pristine sound. R Series bass drivers are built using a two-part structure, where a shallow concave aluminium skin sits atop a paper cone. This great stiffness, combined with the cone's unique geometry, delivers pure piston like movement to deliver punch and speed. To accurately control this mighty driver, KEF has also completely redesigned its magnet system to create a more even magnetic field. The overall result is more impressive and impactful.

Flexible port technology

When it comes to generating deep, articulate bass, port design is crucial. The ports in R Series feature innovative flexible walls. Using computational fluid dynamics, the flare and profile of each port is calculated to delay the onset of turbulence, while the flexible port walls prevent longitudinal 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.

Technical specification

COLOUR
Black Gloss, White Gloss
SPEAKER BUILD
Drivers
BASS REFLEX
floor bassreflex
DESIGN
Three-way bass reflex
DRIVE UNITS
Uni-Q Driver Array: HF: 25mm (1in.) vented aluminium dome MF: 125mm (5in.) aluminium cone
BASS UNITS:
LF: 4x 165mm (6.5in.) hybrid aluminium
TYPICAL IN-ROOM BASS RESPONSE
26Hz (-6dB)
FREQUENCY RANGE
30Hz-50kHz (-6dB)
FREQUENCY RESPONSE
46Hz-28kHz (±3dB)
CROSSOVER FREQUENCY
400Hz, 2.9kHz
AMPLIFIER REQUIREMENTS
15-300W
SENSITIVITY (2.83V/1M)
88dB
HARMONIC DISTORTION 2ND AND 3RD HARMONICS
<0.3% 120Hz-20kHz (90dB, 1m)
MAXIMUM OUTPUT (SPL) (PEAK SOUND PRESSURE LEVEL AT 1M WITH PINK NOISE)
113dB
IMPEDANCE
8 Ohms (min.3.2Ohms)
DIMENSIONS (L x W x H)
36 x 20 x 124.9
WEIGHT
37.7 kg
Datasheet
Press Article

Opinions

Setup is simpler compared to many other speakers, and the R series flagship R11s don’t require a palatial room to work their magic. Pleasing presence—sonically and aesthetically—remarkable realism and inter-driver coherence, high value in the cost-to-performance arena…there’s a lot to love about the R11s. With good reason, they’re popular and selling like the proverbial hotcakes. Get ’em while they’re hot!

Julie Mullins
The Absolute Sound
They certainly sound a whole lot more, delivering a sound combining maturity and ease of listening with massive low-end punch when required, great imaging and fine detail. Choose one of the striking finishes to match your room, and just enjoy: this is high-end audio made easy.

James Parker
Hi-Fi News
The R11s provides a textbook-accurate frequency response, with punchy, extended, fast bass. Its midrange transparency and reproduction of detail are beyond reproach -- always smooth, never edgy, yet not recessed. Nor was the R11’s treble response ever etched or overaccentuated or sibilant, but always clear and extended. And their imaging abilities were outstanding for large floorstanders, equaling what my reference two-way minimonitors can do.

Diego Estan
SoundStage! Hi-Fi

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