Kef R11 Floorstanding Speakers

£4,000.00

Brand Kef

Decades of experience and Kef's unbridled passion for music come together in the new R Series. It combines innovations drawn from the Reference Series with new bespoke technologies to ensure the new R Series delivers more detail, deeper insight and greater excitement.

The largest model in the R Series the Kef R11 combines four 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.

For starters, Uni-Q’s midrange motor system has been completely redesigned using KEF’s in-house simulation and analysis tools as well as decades of experience. The motor is responsible for converting the audio signal from an electrical voltage to a mechanical force. Ideally it does this without any loss and without introducing any distortion. For a midrange driver, significant distortion can be generated due to modulation of the voice coil inductance. The motor in the new R Series has a shaped and undercut pole, and symmetrical aluminium demodulation rings, which combine to significantly reduce the inductance in the lower midrange so there is less variation as the voice coil moves.

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.

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.

Specifications

DESIGN

Three-way bass reflex

 

DRIVE 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 (H X W X D)

1249 x 200 x 383.5 mm (49.2 x 7.9 x 15.1 in.) with terminal*
 
 

DIMENSION (H X W X D)

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

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