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Mobile Fidelity Sound Lab (MFSL, or MoFi) is a company that produces audiophile releases of classic CDs and vinyl records. In the past, MoFi has produced audiophile cassette tapes, and Ultra High Quality Records (UHQRs) that were thicker and higher quality than typical audiophile records.

Many commercial CDs undergo dynamic range compression in order to sound "louder" when played on radio or low-end systems. This is detrimental to the sound quality when reproduced on high-quality equipment. Mobile Fidelity Sound Lab releases are highly desirable for their attention to detail concerning the audio mastering process. Some of the techniques used are half-speed mastering [vinyl] and pressing gold-plated CDs. MFSL also releases record albums meant to be played at 45 RPM instead of the standard 33⅓ RPM, for better sound quality. These albums must be released on two or three discs, as each disc can hold less music at the increased speed.

MFSL only acquires the license to reproduce releases for a specific time period, and because of the limited quantities produced, they are highly sought after.

MFSL became highly noticed in 1981 when they released The Beatles box set. The set comprised of all 13 of the original British versions of their albums pressed off the original Abbey Road Studio master tapes. With the high-density "virgin" vinyl and Half-Speed mastering used, these albums produced sonic nuance never previously heard on earlier Beatles releases. Each album cover had a picture of the actual studio tape in its box along with the engineer's log sheet. An album-sized booklet displaying the original album covers was also included. The box set was such a success that they followed up with the Frank Sinatra and Rolling Stones box sets respectively.

MFSL has had a small number (four) of excellent mastering engineers over the years. Engineers Stan Ricker and Jack Hunt mastered all of MoFi's half-speed vinyl releases in the 1970s and 1980s. Shawn R. Britton has mastered all the CD-format and variations product since 1996, and is coming up to speed on lacquer mastering under the guidance of Stan Ricker as of this writing.

MFSL has been through two incarnations. The original company folded in November, 1999 when their main distributor went bankrupt, taking a large chunk of deliverable money with them. In 2002, the label was resurrected by Music Direct and has been producing well received Super Audio CDs, GAIN 2 Ultra Analog Limited Edition vinyl, Ultradisc II Gold CDs and Ultradisc CD-Rs since then. After nearly five years of service, in March of 2007, MFSL's Vice President of Marketing and Communications Coleman R. Brice left MFSL to run his own label - AERIA Records of Asbury Park, NJ.

Some of MFSL's other well known releases include:

• A Night at the Opera (Queen)
• Live Peace in Toronto 1969, John Lennon/Plastic Ono Band, Imagine (John Lennon & The Plastic Ono Band)
• Atom Heart Mother, Meddle, The Dark Side of the Moon, The Wall (Pink Floyd)
• Tommy (The Who)
• Lost In Space (Aimee Mann)
• Nevermind, In Utero (Nirvana)
• Mr. Tambourine Man (The Byrds)
• Bridge Of Sighs (Robin Trower)
• Blow By Blow (Jeff Beck)
• The Lonesome Jubilee (John Mellencamp)
• White Light/White Heat (The Velvet Underground)

• List of record labels
• Loudness war
• Dynamic range

• Official site