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.

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. 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.

 Just add source

LSX follows this tradition. The even smaller boxes contain four amplifiers, one for each driver, totaling 100w per speaker, whilst the streaming preamplifier provides a wide range of potential sources, both wired and wireless.
LS50 Wireless was the ‘biggest small system’ available. Not simply a pair of speakers, it was a total solution, bringing exceptional sound quality in an easy to install package.

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 Engine™, 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.

True stereo sound is unleashed

In order to enjoy high resolution music on LS50 Wireless without the issue of dropout or latency, an Ethernet cable was employed. Now for LSX, a proprietary wireless technology has been developed, allowing you to cut the cord, supporting 48kHz/24bit audio wirelessly between the speakers (higher resolution files are downsampled). (The option to use a cable between the speakers is still there, allowing for playback of up to 96kHz/24bit.)

• Wi-Fi & Bluetooth®

Wirelessly access all the music in the world through Spotify® Connect, Tidal ® or access a music library stored on a NAS drive via DLNA ® and uPNP, or Bluetooth with Qualcomm® aptX™. Apple® AirPlay ® 2 will extend LSX to become part of a multi-room wireless music system, easily controlled from iOS devices.

• Optical

As TV sets became thinner, their sound quality decreased. Vastly improve your TV experience with LSX’s optical input, or connect your games console or other equipped source.

• Analogue (Aux)

Friends want to plug in their phone? No problem. At the forefront of the vinyl revival? Add a phono stage to your turntable and connect to LSX. They aren’t fussy about the age of technology used.

• Subwoofer output

Whilst LSX already provides impressive bass output, some people want to get even lower. An RCA output allows easy connection to the award winning Kube range of subwoofers, available in three different sizes to cater for different rooms and personal taste.

• USB ‘charge out’

Personal assistant devices deserve to have a great voice. Using one of the audio inputs, you can play your Google Chromecast Audio, Amazon Echo Dot or other compatible device. The USB ‘charge out’ output provides the power. You just need to provide the music.

• Simplicity itself

A reworked control system via two new apps - KEF Control and KEF Stream - makes using LSX a breeze. Intuitive layouts and easy to follow inapp guides will make you a master in minutes.Use Control to setup the speaker, apply sound settings, turn on/off LSX and switch sources. A front mounted LED provides instant source notification and feedback to the listener. Future firmware updates can be carried out ‘over-the-air’ through the app (with LSX connected with the inter-speaker cable).

For the speaker sound settings, particular attention has been paid to reduce the threshold of Hi-Fi knowledge required so that anybody can quickly and easily tailor the sound how they like it. The optional Stream app gives you access to your locally or network stored music, as well as Tidal (with a valid Hi-Fi tier subscription), playing up to 96kHz/24bit high resolution audio.

Driver Units	Uni-Q Driver Array: HF: 19mm aluminium dome LF/MF 115mm magnesium/aluminium alloy cone
Frequency Range(-6dB) measured at 85dB/1m	49Hz - 28 kHz
Frequency Range(+/-3dB) measured at 85dB/1m	54Hz - 28 kHz
Power Input	100-240VAC 50/60Hz
Amplifier Output Power	LF: 70w HF: 30w
Max SPL	102dB
Input resolution	up to 192kHz/24bit (depending on source resolution)
Master/Slave speaker connection	Wireless: Proprierty connection 2.4GHz (transmit 24kHz/24bit) Wired: RJ45 Ethernet (transmit 96Hz/24bit
Inputs	2.4GHz/5GHz Dual -band WiFi network Bluetooth 4.2 with aptX® codex TOSLINK Optical 3.5mm Auxillary Input RJ45 Ethernet (for network)
Wi-Fi Standard	IEEE 802.11 a/b/g/n
Wi-Fi Network Frequency Band	Dual-band 2.4GHz/ 5GHz
Bluetooth Range & Memory	10m 8 devices
Bluetooth Frequency	2.402Ghx - 2.48GHz 2.5mW (Bluetooth Class 2 Device)
Dimension (Each Speaker)	240mm Height 155mm Width 180mm Depth
Weight	3.6kg [each speaker]

 

PRODUCT OF THE YEAR - WHAT HI-FI? 2019 ‘The LSX is a scaled-down, carefully crafted copycat of its sibling, and for that is just as triumphant.’ Full Review

SMART SPEAKERS OF THE YEAR $1000 - $2000 "the true stereo KEFs with their coaxial drivers deliver a higher level of hi-fi, effective at medium listening levels from Bluetooth, but far better using the Wi-Fi connection, where they can be entrancingly effective music-makers from such attractive and compact cabinets." Full Review

EISA WIRELESS STEREO SPEAKER 2019-2020  KEF LSX "...With Apple AirPlay 2 and Bluetooth built-in, plus access to Spotify and tidal, all controlled from aneat app on your smartphone, this could be all the hi-fi system many users will need". — 2019 Full Review

5 STAR REVIEW – WHAT HI-FI? SOUND AND VISION "Take heed, rival systems, these miniature marvels are going to take some beating.” — 2018 Full Review

DIAPASON D'OR "Outstanding… The stereo image is perfect" — 2018

STUFF.TV "It’s about as impressive an all-round system as we’ve heard for the money." - 2018    Full Review

KNOCKOUT PUNCH AWARD - DARKO.AUDIO "Rarely has a DAR-KO Award been so easy to give" — 2018    Full Review

THIS AFFORDABLE ALL-IN-ONE SYSTEM IS THE PERFECT HI-FI PACKAGE – GEARPATROL.COM “Frankly, there’s no glaring weakness with the KEF LSX. This system is still fairly expensive, true, but it’s the most versatile, compact speaker system that I’ve come across. You can connect it to your TV or turntable, or stream straight from the Spotify (and soon-to-be Apple Music) app. It’s also so, so easy to use. You don’t have to be an audiophile or tech nerd to really enjoy the LSX. You just have to be somebody who appreciates fantastic stereo audio.” — 2018 Full Review

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