KEF LSX II Review

Research note: This is an independent, research-based assessment built from official specifications and product documentation. We have not claimed a hands-on laboratory test.

Why two speakers matter

Unlike a one-box smart speaker, LSX II places the left and right channels in separate cabinets. That physical spacing provides a more stable centre image, clearer placement of instruments and a larger listening area when positioned correctly. The benefit depends on thoughtful separation, toe-in and listening distance rather than simply placing both units on the same crowded shelf.

Uni-Q driver architecture

KEF’s Uni-Q places the tweeter in the acoustic centre of the mid-bass driver to produce more consistent dispersion. Each cabinet uses dedicated amplification for its driver sections, allowing the crossover and protection to be managed as a complete system. Compact dimensions limit the deepest bass and maximum room scale, but a dedicated subwoofer output supports expansion.

Streaming platform

AirPlay 2, Google Cast, Spotify Connect, TIDAL Connect, Qobuz and Roon Ready support make LSX II far less dependent on one mobile platform than many smart speakers. The KEF Connect app handles setup, firmware, service access and sound settings. Streaming resolution varies by service and by whether the speakers are connected to each other wirelessly or by cable.

HDMI ARC, USB-C and physical sources

HDMI ARC allows direct TV connection and volume control, while USB-C makes LSX II suitable for a desktop computer. Optical and analogue inputs cover additional digital players, turntables with phono stages and legacy sources. This physical flexibility is a major advantage over app-only speakers and can reduce the need for a separate amplifier.

Inter-speaker connection and placement

The primary and secondary speakers communicate wirelessly for convenient placement, but a cable permits the highest supported resolution and can improve reliability in congested networks. Both speakers still require power. Owners should plan cable routes, stable stands or isolation pads and enough distance from rear walls to keep bass controlled.

Room EQ and subwoofer integration

The app provides placement-related sound settings and advanced options for users who want more control. A subwoofer can extend bass for larger rooms and films, with crossover settings managed in the system. These tools help integration but cannot compensate for severely asymmetrical placement or a reflective room.

Value and upgrade path

LSX II costs substantially more than Sonos Era 100 or HomePod, yet it replaces speakers, amplification, streamer, DAC and several input devices. Its value is strongest for buyers who would otherwise assemble a small stereo system. Those seeking casual background music may not benefit enough from the additional precision and connectivity.

Who should buy it?

Buy LSX II if genuine stereo imaging, compact dimensions, TV sound and broad streaming support are all priorities. It suits desks, bedrooms and smaller living rooms where a full-size system would be impractical but a single smart speaker feels limiting.

Alternatives to consider

KEF LSX II LT offers a simplified and less expensive route into the same concept. KEF LS50 Wireless II provides greater scale and bass at a much higher price. Dynaudio Focus 10 is a high-end alternative, while a pair of Sonos Era 100 speakers offers easier multi-room use for less money.

Verdict

KEF LSX II is one of the most complete compact wireless stereo systems available. True left-right separation, excellent physical inputs and broad streaming support justify much of the premium, although careful placement and cable planning remain important.

Primary source

KEF LSX II official product page