KEF LSX Wireless Active Speakers

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KEF LSX Wireless Active Speakers



Born from LS50 Wireless

Built upon the same platform as the critically acclaimed LS50 Wireless, LSX is true to KEF’s founding principles - to create exceptional experiences through excellence in engineering.

LSX retains the same philosophy as LS50 Wireless, utilising one amplifier for each driver - two amplifiers totalling 100w in each speaker . A streaming preamplifier and DSP section, combined with a new incarnation of KEF’s legendary Uni-Q driver array is nestled within a FEA designed cabinet with a curved front baffle, proudly displaying the unique heritage of the LS50 family.

 A Uni-Q experience

At the heart of LSX’s audio prowess is the new 4” Uni-Q driver array. This is a signature KEF technology continuously developed since 1988. Through precise positioning of the drivers, all frequencies emanate from the same point in space. This is called a point source, working in a similar way to the human voice.

The effect is an amazing spread of sound - no tiny ‘HiFi sweet spot.’ Coupled with an extremely natural response, neither adding nor removing from the original recording, the soul of the music is fully realised by everybody in the room. Alongside refinements throughout, the main addition is the ribbing of the midrange driver. This strengthens the cone, reducing distortion, leaving behind a purer, more natural sound.


Setting the stage

Even the cabinet is packed with acoustic benefits:

  • The curved front baffle reduces the diffraction effect, meaning any extra sound scattering into the room is drastically reduced.
  • The FEA designed cabinet and bracing, alongside constrained layer damping (CLD) reduces resonance of the cabinet
  • An FEA designed flared bass port also reduces the ‘chuffing’ effect at higher volumes.
  • An almost invisible, yet ingenious heatsink design keeps the system cool, maximising electronic and driver performance.
  • All of this contributes by not contributing. Rather, it lets the Uni-Q driver be the sole performer, providing a clear, natural and accurate sound.

Perfecting sound

A passive speaker is an imperfect system full of compromise. When music is sent to different drivers, the process can cause phase issues, otherwise known as ‘time smearing.’ This makes music sound disorganised. KEF’s unique Music Integrity EngineTM, combined with the point source technology of Uni-Q, ensures that sound not only comes from a single point in space, but all at the correct time. The result is a tighter sound, with a beat that can be followed and a soundstage where you can almost point to where the sound is coming from.


Model LS50
Design Two-way bass reflex
Drive units Uni-Q driver array:
HF: 25mm (1in.) vented 
aluminium dome
LF/MF: 130mm (5.25in.) 
magnesium/aluminium alloy
Frequency range (-6dB) 47Hz - 45kHz
Frequency response (±3dB) 79Hz - 28kHz
Crossover frequency 2.2kHz
Amplifier requirements 25 - 100 W
Sensitivity (2.83V/1m) 85dB
Harmonic distortion
2nd & 3rd harmonics (90dB, 1m)
<0.4% 175Hz-20kHz
Maximum output 106dB
Nominal impedance 8Ω (min. 3.2Ω)
Weight 7.2kg (15.8lbs.)
Dimension (H x W x D) 
(with terminal)
302 x 200 x 278 mm
(11.9 x 7.9 x 10.9 in.)


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