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KEF R11 Floorstanding Speakers

£4,000.00
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Product Description

R11 is the flagship of the new R Series range. Boasting four 165mm (6 in.) hybrid aluminium bass drivers, R11 digs deep and retrieves an exceptionally clean and musical low-end performance.

 

 

Nestled in the centre of these lies the new 12th generation Uni-Q driver array. The 125mm (5 in.) midrange driver and 25mm (1 in.) aluminium dome tweeter combine to deliver an even more natural midrange and treble than believed possible at this price point. The result is a speaker that can pick out the softest details with grace and refinement, as well as deliver raw power and strength.

Shadow Flare
Derived directly from the Reference Series, the Shadow Flare is an innovative method of reducing harmful cabinet diffraction and one that allows the wonderful Uni-Q to work at its highest level.

Shadow Flare is more than just a trim ring. It is a precision designed surface that 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, minimising the acoustic impact to negligible levels.

The result is improved clarity, particularly when it comes to the subtle nuances of plucked strings and other percussive sounds.

Bass Drivers
To maximise bass performance in the new R Series, the dedicated low-frequency drivers are built using a two-part structure, where a shallow concave aluminium skin sits atop a paper cone. This stiffness combined with the cone’s unique geometry reduces additional resonances and delivers the pistonic movement that makes these drivers time so well.

The new drivers also benefit from a completely redesigned magnet system that creates a more even magnetic field, and a design of suspension that reduces harmonic distortion for a cleaner, more precise sound.

The result is tight, agile bass that digs out all the soul and punch available in the low end.

Cabinet Bracing
All the cabinets in the new R Series benefit from Constrained Layer Damping bracing. Originally developed for the multiple award-winning LS50, this system utilises internal braces joined to the panels by a lossy interface rather than being adhered to it rigidly. This approach is highly effective at dissipating unwanted vibrations.
A new internal bracing layout works alongside Constrained Layer Damping to create an incredibly inert platform from which the drive units can work their magic, enabling the R Series to deliver music as it is supposed to sound, without any unwanted extras.

Flexible Port Technology
When it comes to generating deep, articulate bass, port design is a vital element.

The ports in the R Series are precisely positioned and 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.

The result is not only better bass, but cleaner sound further up the frequency range in the vital lower midrange area.

R11 Specifications
Design Three-way bass reflex
Drive Units HF: 25mm (1in.) vented aluminium dome
MF: 125mm (5in.) aluminium cone
Bass Driver:
LF: 4 x 165mm (6.5in.) hybrid aluminium
Crossover Frequency 400Hz, 2.9kHz
Frequency Range (-6dB) 30Hz - 50kHz
Typical in-room Bass Response (-6dB) 26Hz
Frequency Response (±3dB) 46Hz - 28kHz
Harmonic Distortion (90dB, 1m) <0.3% 0.3% 120Hz - 20kHz
Maximum Output 113dB
Amplifier Power (recommended) 15 - 300W
Nominal Impedance 8Ω (min.3.2Ω)
Sensitivity (2.83V/1m) 90dB
Weight 37.7 kg (83.1 lbs.)
Dimensions (H x W x D) 
with terminal
1249 x 200 x 383.5 mm
(49.2 x 7.9 x 15.1 in.)
Dimension (H x W x D) with terminal with Plinth 1295.5 x 310.6 x 383.5 mm
(51 x 12.2 x 15.1 in.)
Finishes Black Gloss / White Gloss / Walnut
 

Product Videos

KEF The All-New R Series 01:23

http://www.kef.com/html/en/showroom/hi-fi_series/r_series/ Facebook: https://www.facebook.com/KEF.Audio Live it. Feel it. The all-new R Series delivers a sound so pure you live each and every moment.

  • KEF The All-Ne...
    http://www.kef.com/html/en/showroom/hi-fi_series/r_series/ Fa...

Warranty Information

All KEF Products are precision engineered and the Authorised Distributors provide warranty against FAULTY MATERIAL AND/OR WORKMANSHIP for the following products from the date of original purchase is as follows:- (Warranty may vary according to the local legal requirements of the country concerned.)

Passive loudspeakers: FIVE years
Active loudspeakers, powered subwoofers and motorised speakers: ONE year, or TWO years if purchased in the European Union
Electronics and headphones: ONE year, or TWO years if purchased in the European Union

This warranty will not be extended or renewed at the expiry of the above period.

WARRANTY COVERAGE AND LIMITATIONS

This warranty is only valid in the country of purchase and only applies to the first purchaser of the KEF product(s) from an Authorised Dealer. This warranty does not extend to any other person or transferee, and terminates if you sell or otherwise transfer the KEF product(s) to another party/entity.

This warranty does not cover any of the following:-

normal or fair wear and tear and/or any wear from environmental deterioration of the KEF product and/or its components
mechanical damage or derangement of the KEF product in transit that is not attributable to the fault of the KEF and its Authorised Distributor
deterioration of any consumable components of the KEF product which would become worn or depleted through use (e.g. batteries)
any KEF product whose serial number label(s) is/are missing, made illegible, defaced, altered, removed, or damaged
any KEF product and/or any of its components that is not purchased from an Authorised Dealer/Distributor, including any parallel imports or grey market products
incorrect or unauthorised components which have been substituted and/or used for the KEF Product;
any KEF Product and/or any of its components which have been installed, disassembled, repaired, converted, modified, tampered with or otherwise interfered with in any way by any person/entity other than an authorised representative of the KEF and its Authorised Distributors
any defects, malfunction, loss and/or damages caused by or resulting from any of the following:-
any of the circumstances set out in (1) - (7) above
any accident or negligence not caused by the fault of KEF and its Authorised Distributors
any improper installation or connection of the KEF product (including without limitation any improper connection of the KEF product to improper voltage or power source) not caused by the fault of any of the KEF and its Authorised Distributors
any improper care, dropping, mishandling, misuse, abuse or unreasonable or improper use, operation or maintenance of the KEF Product
any operation of the KEF product with any faulty, unsuitable or inappropriate apparatus and/or ancillary equipment
any use of the KEF Product under abnormal or inappropriate voltage or power surges;
failure to use, operate or maintain the KEF product in accordance with the instructions set out in the users' manual
exposure of the KEF product to extreme temperature, heat, water or other liquids, insects, excessive moisture, sand, chemicals, battery leakage or any other contaminants
any force majeure events, including but not limited to any acts of God, fire, lightning, typhoon, storm, earthquake, hurricane, natural disaster, tsunami, flood, war, riot, public disturbance
any other causes beyond the reasonable control of either KEF and its Authorised Distributor.

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