KEF Blade (pair)

The world’s first Single Apparent Source loudspeaker.
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Single apparent source Like listening to one voice rather than many, sound from a single source is inherently clearer. Not only are the acoustic centres of the HF and MF drivers in the Blade’s Uni-Q array coincident, but the four LF drivers are mounted symmetrically equidistant from it so that their acoustic centres occupy exactly the same point in space. This single apparent source configuration is what makes the Blade so gratifyingly coherent across the frequency range, with noticeably more precise imaging than is possible from any conventional speaker. What you hear sounds as if it’s being performed live right in front of you. Force cancelling To avoid dissipating the energy of such potent bass drivers in exciting the cabinet (and thereby generating resonance, especially at high volume), the large kinetic forces involved are cancelled out by mounting the LF drivers rigidly together, back-to-back. By minimising cabinet colouration, this highly effective configuration partly accounts for the Blade’s natural-sounding and engagingly musical performance. Discrete bass chambers The twinned pairs of bass drivers are mounted in discrete chambers separated by an internal partition. By increasing the frequency of any internal standing waves to way beyond the crossover point, this reduces the need for damping material (which can otherwise impair bass quality). Nothing has been overlooked in the quest for the ultimate clarity, right across the frequency range. Attention to detail With a speaker as ambitious as the Blade, short cuts are out of the question. Everything has to be as right as it can possibly be. Terminals & terminal links Two pairs of the finest audiophile quality WBT connectors allow bi-wiring or bi-amping to optimise the retrieval of low level detail in the music. Low order crossovers The simple low order crossovers specified for the Blade employ the best components available, carefully selected by a rigorous auditioning process so that every part of the signal path is fine-tuned for maximum clarity. Hard wiring The patented screw-in linking plugs are to full audiophile specification (as well as simplifying set-up by eliminating fiddly wiring links). All the crossover components are individually wired by hand rather than mounted on a conventional printed circuit board. As well as being more environment-friendly, this optimises both reliability and sound quality by assuring the cleanest possible signal transmission.
Raphael Eismann

We have a wide range of KEF speakers available for demonstration in our HiFi and home cinema studios in Berlin-Kreuzberg. We look forward to your visit!

Design Three-way bass reflex,
Single apparent source
driver configuration
Drive Units Uni-Q driver array:
MF: 125mm (5in.) Li-Mg-Al /LCP hybrid cone
HF: 25mm (1in.) Al dome
Bass units:
LF: 4 x 225mm (9in.) with force cancelling
Frequency range free field (-6dB) 28Hz - 45kHz
Frequency range typical in room bass response (-6dB) 20Hz
Frequency Response (±3dB) 40Hz - 35kHz ±3dB
(-6dB at 28Hz)
Crossover frequency 350Hz, 2.3kHz
Amplifier requirements 50 - 400 W
Sensitivity (2.83V/1m) 91dB
Harmonic distortion 2nd & 3rd harmonics (90dB, 1m) <0.5% 40Hz – 100kHz
<0.2% 200Hz – 10kHz
Maximum output (peak sound pressure level at 1m with pink noise) 117dB
Impedance 4Ω (min. 3.2Ω)
Weight 57.2 kg (126 lbs)
Dimensions - with plinth (H x W x D) 1590 x 363 x 540 mm
(62.5 x 14.3 x 21.2 in.)
Dimension Drawings
Finishes Piano black
Snow white
Racing red
Warm metallic grey
Light metallic silver
Frosted blue
Frosted copper black

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Sat: 10 a.m. - 3 p.m.

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