The task of this element with a labyrinthine system of narrow channels is to optimize the working conditions of the tweeter, specifically to suppress the sound wave radiated by the back of the dome. It is made up of 30 miniature quarter-wave resonators, each tuned to a different frequency. In KEF monitors, the metamaterial (hence the name Meta) took the form of a flat, two-layer ABS plastic disc. The most important is related to the use of the so-called acoustic metamaterial, developed by the Chinese company Acoustic Metamaterials Group (AMG). The key changes in the new version of the “fifty” concern the Uni-Q unit, but we will not see them from the outside. Similar to the original LS50, the speaker received a specific Z-FLEX suspension (the part that touches the diaphragm is flat so that the speaker smoothly “passes” into the front panel), the purpose of which is to minimize diffraction. On the other hand, the aluminum-magnesium mid-woofer has nine ribs that eliminate standing waves and, as a result, shift mechanical resonances beyond the working area. In its center, there is a metal dome, surrounded by the Tangerine Waveguide – a stationary element made of nine “leaves”, whose task is to ensure wide dispersion. As intended, this 13 cm unit simulates a point sound source and reproduces most of the acoustic spectrum. It is made of a characteristically curved wall made of plastic, in the center of which a Uni-Q (12th generation) loudspeaker is mounted. Harmonic distortion (90dB, 1m): KEF LS50 Meta Manual KEF LS50 Meta Review – Constructionįrom the outside, not much has changed: the bass-reflex port located in the upper right corner, the middle part of which is made of foam, now has a more oval shape, and holes have been removed from the corners of the rear panel protruding beyond the enclosure.Frequency response (☓dB): 79 Hz – 28 kHz.Typical in-room bass response (-6dB): 26 Hz.Drive units: Uni-Q Driver Array: HF: 25 mm (1 in.) vented aluminum dome with Metamaterial Absorption Technology, MF/LF: 130 mm (5.25 in.) aluminum cone.Where did this intriguing name come from and what does the new sound like? KEF LS50 Meta Specifications This project has, for example, a wireless version (Wireless) and the Meta, which has just been launched. Eight years have passed since then, but the “Fifties” are still the apple of the eye of the engineering team led by Jack Oclee-Brown. KEF celebrated its 50th anniversary with the construction of the LS50 monitors, which, along with designs such as Muon and Blade, became the showcase of this British brand. 2.1 You can download the manual here->KEF LS50 Meta Manual.
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