About the KEF R11
Sweet, detailed sound — and lots of it
Sweet, detailed sound — and lots of it
Putting together a dream system for high-performance stereo or home theater? A pair of KEF's R11 floor-standing speakers would make a great foundation. This flagship model in KEF's newly redesigned R Series uses a total of six drivers in its slim, solidly built cabinet. Feed it good, clean amplification, and you should be practically swimming in the kind of wide-open detail that's made KEF a famous name in speakers worldwide.
This speaker comes in three beautiful finishes, and it includes stabilizing outrigger feet with carpet spikes.
A room-filling "sweet spot," thanks to Uni-Q® technology
KEF's patented Uni-Q technology places the speaker's 1" tweeter in the acoustic center of a 5" midrange driver. This concentric array allows sounds to originate from a single point source, making the "sweet spot" (the ideal listening position) much larger.
The R11 and other R Series models use KEF's latest refinement of Uni-Q technology. KEF has managed to reduce coloration by cutting resonance in the tiny gaps between the Uni-Q array's elements, for purer and more precise sound and even better imaging. And the ring you see around the Uni-Q array is what KEF calls their "Shadow Flare": its shape is carefully profiled to reduce high-frequency diffraction (a kind of interference), for the purest possible sound.
High-tech woofers for punchy bass
Each of the four 6-1/2" hybrid aluminum woofers is made up of a shallow aluminum skin atop a paper cone. This hybrid design allows very precise movement, for dynamic, accurate bass. And the two rear-firing ports have innovative flexible walls to prevent air turbulence and unwanted resonance from coloring the sound.
Part of a complete KEF surround sound system
The KEF R Series features an array of speakers that are voice-matched for compatibility in an immersive surround sound system:
- 3-way design
- 1" vented aluminum dome tweeter
- 5" aluminum midrange driver
- tweeter and midrange use KEF's Uni-Q technology, with tweeter in center of midrange driver
- creates a large listening "sweet spot" in your room
- four 6-1/2" hybrid aluminum woofers
- frequency response: 46-28,000 Hz (±3 dB)
- sensitivity: 90 dB
- impedance: 8 ohms
- recommended amplifier power: 15-300 watts
- bass-reflex cabinet with Constrained Layer Damping to reduce resonance
- dual rear-firing ports with flexible port technology for deep, articulate bass
- two sets of input terminals allow bi-amping or bi-wiring
- high-gloss white finish
- detachable microfiber grille
- included plinth and carpet spikes provide added stability
- 12-1/4"W x 51-3/16"H x 15-5/16"D (including plinth and terminals)
- weight: 83.1 lbs.
- warranty: 5 years
- Our 60-day money-back guarantee
- MFR # R11WH
What's in the box:
- Floorstanding loudspeaker
- 2 Foam port plugs
- 4 Outrigger feet
- 4 Spikes
- 4 Protective discs
- 4 Screws
- 4 Washers
- User Manual
- Warranty Information
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More details on the KEF R11
Features & specs
|Tweeter Size (inches)||1|
|Midrange Size (inches)||5|
|Woofer Size (inches)||6.5|
|Woofer Composition||Hybrid Aluminum|
|Built-in Powered Sub||No|
|Dolby Atmos Drivers||No|
|Connector Type||Binding post|
|Parts Warranty||5 Years|
|Labor Warranty||5 Years|
|Frequency Response||46-28k Hz|
|Subwoofer Amp Power||---|
3-Way Floorstanding Speaker: The KEF R Series R11 floorstanding loudspeaker utilizes a 3-way driver design that consists of a 12th Generation Uni-Q driver array with a 1" tweeter mounted in the center of a 5" midrange driver, plus four 6.5" low-frequency bass drivers for exceptional clarity, flawless precision, and superb dynamics.
12th Generation Uni-Q Driver Array: At the heart of the R Series loudspeaker is KEF's Uni-Q driver array. This signature innovation by KEF places the tweeter in the acoustic center of the mid-bass cone, with both drivers acting as a single point source. The R Series benefits from a new 12th generation Uni-Q Driver Array which has been extensively designed using KEF's in-house simulations and analysis tools. KEF's engineers have been able to dramatically reduces coloration through reducing resonance in the small gaps between the Uni-Q's separate elements. The resulting sound is purer and more precise with better stereo imaging.
- 1" Aluminum Dome Tweeter: At the center of the Uni-Q driver array is a 1" aluminum dome tweeter with KEF's tangerine waveguide to help disperse the higher frequencies evenly across a wider angle and flood the room with a natural soundfield. The tweeter's large neodymium magnet and a computer-optimized dome structure deliver articulate high frequencies with flawless precision. In addition venting the tweeter reduces pressure behind the dome, increasing midrange bandwidth and lowering distortion.
- 5" Aluminum Alloy Midrange: Surrounding the 1" aluminum dome tweeter is a 5" aluminum midrange driver. The R11's midrange response is amazingly fast and clean, thanks to the aluminum alloy cone, KEF's Z-flex surround smoothing the transition to the front-panel, and a sturdy die-cast aluminum chassis that prevents resonance from being transferred to the cabinet. In addition, large voice coils increase the driver's power handling and dynamics, reducing distortion and delivering exceptional vocal clarity.
Shadow Flare: Derived directly from KEF's Reference Series, the Shadow Flare is an innovative method of reducing harmful cabinet diffreaction for delicate high-frequencies. Shadow Flare is a carefully profiled transition surface which extends the waveguide effect of the Uni-Q Driver Array. 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.
Quadruple 6.5" Bass Woofers: The KEF R11 floorstanding speaker houses four 6.5" hybrid aluminum cone bass drivers. The R Series bass drivers have a two-part structure with a shallow concave aluminum skin atop a paper cone. Combine this stiffness with the cone's unique geometry and you get near pistonic movement for low-frequency punch and fast speed. KEF has also increased linearity in the magnet system which means more impressive and impactful bass.
Non-Resonant Cabinet w/ Flexible Port Technology: The KEF R Series speaker cabinet benefits from a constrained layer damping with internal bracing which is highly effective at dissipating unwanted vibrations that would otherwise artificially change the sound of the music. The speaker cabinet also utilizes a bass reflex design with dual rear-firing ports that feature innovative flexible walls. Using computational fluid dynamics (CFD) the flare and profile of each port is calculated to delay the onset of turbulence and the flexible port walls prevent resonances from coloring the midrange.
Note: Foam port plugs are included to insert into the rear-firing ports, if the bass is to "boomy" due to room placement.
Microfiber Grille: The KEF R Series loudspeaker comes with a microfiber grille that is hand-crafted and compressed with heated pressure from 13 layers of composite material. The R Series speaker is designed to sound its best with our without the grille installed. The microfiber grille magnetically attaches to the cabinet.
Dual Binding Posts: On the rear of the speaker cabinet are dual sets of heavy-duty, nickel-plated binding post terminals that will accept bare wire (up to 10AWG), pin-connectors, spade-lugs, and banana plugs (single only). Plastic inserts must be removed from the binding posts to use banana plugs. Using the dual sets of binding posts, you can bi-wire or bi-amp the speaker.
- Bi-Wiring: Bi-wiring can provide noticeable improvements in the overall transparency of your loudspeakers. Run separate speaker wires to the low & high/mid frequency drivers from a single amplifier (the upper set of binding posts are for the high frequency drivers; the lower set of binding posts are for the low frequency drivers).
- Bi-Amping: Bi-amping allows you to use separate amplifiers for the high/mid & low frequency sections of your loudspeaker for greater dynamic range & lower distortion. We recommend that your separate amplifiers have identical gain to preserve the speaker's voicing balance.
Note: Unlike many other speakers with dual binding posts, the R Series loudspeaker does not use jumper straps or leads between the high frequency and low frequency terminals. Instead there are two dials (labeled "Link") for the positive and negative high and low frequency terminals which can be adjusted to either connect the high and low frequency terminals together to power the speaker off a single amplifier channel (default setting) or disconnect the high and low frequency terminals from one another in order to bi-amp the high and low frequency drivers separately.
Outrigger Feet: The included outrigger feet provide a larger, more stable footprint with greater stability. The outrigger feet screw into the bottom of the speaker cabinet using the included hardware, while the include spikes screw directly into the bottom of the outrigger feet. The spikes are designed for carpeted flooring. Protective discs are also included to put under the spikes if placing the speaker on hardwood, tile, laminate, and vinyl flooring.
- Dimensions with Spikes: 12.25" (w) x 51.1875" (h) x 15.3125" (d)
- Dimensions with Discs: 12.25" (w) x 51.375" (h) x 15.3125" (d)
Note: The floorstanding peaker should always be used with the outrigger feet installed for maximum stability and optimum performance.
Placement Options: A pair of floorstanding speakers should be positioned 5' to 10' apart and form a equilateral triangle with the main listening position. They should be positioned at least 9" from the back wall due to their rear-firing port and 20" from side walls. The speakers can be "toed-in" or angled inward toward the main listening area to improve stereo imaging and soundstage.
R Series: The KEF R Series combines innovations from KEF's Reference Series with new custom-made technologies and a 12th generation Uni-Q Driver Array to deliver incredible detail and dynamic sound. The KEF R Series consists of three floorstanding loudspeakers (R11/R7/R5), one bookshelf loudspeaker (R3), a center-channel speaker (R2c), and a Dolby Atmos surround speaker (R8a).
Optional Powered Subwoofer: For even bigger and deep bass response, you can add one of KEF's powered subwoofers; such as the KF92 or one of their Kube Series powered subs (sold separately - see Accessories Tab).