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Three U2 albums were released on MFSL CD War in January 1993, The Unforgettable Fire in March 1995, and The Joshua Tree in November 1996. Ultradiscs were also packaged in a unique hinged “lift-lock” jewel case to make removing the CD from the case effortless. U2’s albums released on MFSL CD all utilized the Ultradisc II technology. In 1992, the Ultradisc II was introduced, featuring a thicker gold coating and a more advanced bonding process. Gold resists the oxidation that could limit the shelf life of standard CDs. In 1984, MSFL released their first albums on compact disc, and in 1987 introduced the Ultradisc, which used 24-karat gold rather than aluminum as the CD coating.
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MFSL continued to advance the art of audio technology throughout the 80s and 90s, introducing Original Master Recording cassettes, duplicated in real time as opposed to high-speed dubbing, in 1981. The 1979 MFSL release of Pink Floyd’s Dark Side of the Moon put the label on the map as a major player in the audiophile world. MFSL built a reputation for high fidelity by mastering albums directly from the original master tapes, as well as other specialized processes such as half-speed mastering of LPs. Miller had begun his career in the late 50s, releasing recordings of steam trains and other environmental sounds on his own imprint, Mobile Fidelity Records. MFSL, a record label specializing in audiophile-quality recordings, was founded by recording engineer and producer Brad Miller in 1977.
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The re-release of U2’s (first) magnum opus features a 2007 remaster supervised by The Edge, but many fans may not realize that The Joshua Tree was remastered once before, over 20 years ago, and released on a specially imprint called Mobile Fidelity Sound Lab ( MFSL). As the Joshua Tree 2017 Tour winds through North America, the 30th anniversary release of the album is just a couple of weeks away.