KEF produced the drivers for that classic design but that’s where comparisons end. Technical innovations aside, the LS50 Meta remains a 2-way bookshelf loudspeaker inspired by the legendary BBC LS3/5a monitor. “A superb example of point source performance, a master-class in coherence, articulation and focus.” Other improvements are evident in both the cabinet and the rearfiring flexible port, making use of state-of-the-art technologies, three of which also boast their own 3-letter acronyms. All clear? In practice, MAT works by absorbing 99% of the unwanted sound produced at the rear of the tweeter, reducing distortion to vanishingly low levels, for a cleaner and more accurate sound. I’ll leave it to KEF to give the concise report: “Metamaterials are specially developed structures that use existing materials in such a way that they exhibit new, desirable properties that are simply not found in naturally occurring substances”. I could provide a lengthy explanation of this technology but it would make your eyes water. Metamaterial Absorption Technology (MAT) is the main improvement in the Uni-Q design and is a joint development with the Acoustic Metamaterials Group. One definition of Meta is ‘referring to itself or to the conventions of its genre self- referential’, which makes perfect sense when you look at the lineage of this new loudspeaker, however that’s not the reason for its appendage here. ![]() The new LS50 Meta shares the visual style of the older model but there have been many significant improvements, not least in the Uni-Q driver array, now in its 12th generation. When the first LS50s became available I made it my business to hear a pair and shortly thereafter recommended them to a friend who still uses them with no intention of changing. The 12th generation Uni-Q unit now incorporates MAT technology to absorb 99% of unwanted sound from the rear of the tweeter. Attached to top-of-the-range Naim electronics, they produced a full-range yet utterly focused sound that remains one of my all-time favourite listening experiences I’ll never forget it. I didn’t book myself in for the show demo – never an ideal listening environment – as I knew they would later be heading to the show organiser’s acoustically tailored listening room and an invitation would be forthcoming. I had the privilege of hearing the Uni-Q driver system slightly earlier than that – when it featured in KEF’s Concept Blade loudspeaker, launched at the Bristol Hi-Fi Show in 2010. KEF’s Uni-Q driver array has been the centrepiece of the LS50 for ten years, the original model first appearing in 2011.
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