Linn Isobarik
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The Linn Isobarik, nicknamed "Bariks" or "Briks", is a loudspeaker designed and manufactured by Linn Products. The Isobarik is known for both its reproduction of low bass frequencies and being very demanding on amplifiers.
Late Isobarik tweeter, Linn D20-LP-2 with the concentric circles and Linn logo. The D20-LP-1 lacked the Linn Logo, sourced from Hiquphon in Denmark
Tweeters taken out of different Isobariks
Early version inside isobaric chamber
KEF
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KEF is a British company specialising in the design and production of a range of high-end audio products, including HiFi speakers, subwoofers, architecture speakers, wireless speakers, and headphones. It was founded in Maidstone, Kent in 1961 by a BBC engineer named Raymond Cooke (1925–1995).
KEF LS50, wireless and Black Edition (2018)
KEF 104 (1973–80)
Reference 5 Meta, Uni-Q