Mobile Fidelity Sound Lab

Mobile Fidelity Sound Lab (MFSL or MoFi) is a record label specializing in the production of audiophile recordings. The company is best known for its reissued vinyl LP records, compact discs, and Super Audio CDs but has also produced other formats.

Mobile Fidelity Sound Lab
Parent companyMusic Direct
Founded1977 (1977)
FounderBrad Miller
Country of originU.S.
LocationChicago, Illinois

In the late 1970s the label earned a reputation for high-quality audio from its Original Master Recording LPs, which had been recorded with its half-speed mastering process. The company was purchased in 1999 by Music Direct in Chicago. In the 21st century, Mobile Fidelity's sales grew with a renewed interest in vinyl.[1]


In the 1950s and 1960s, it was common for record labels to press relatively heavy records on new or "virgin" vinyl. During the economic downturn of the 1970s, the cost of record pressing increased, and many record labels cut costs by pressing lightweight recordings from recycled materials, which were impure. Recycled vinyl pressings have more pops, clicks, and surface noise.

Copying sound from magnetic tape to LP is highly complicated. Apprentice engineers typically spend several years becoming expert in disc mastering. A mastering engineer may need to adjust and or compromise the sound quality of a record in order to maintain loudness and make the groove traceable by the stylus of a record player using a low-quality phono cartridge. Often, sounds have been mastered with additional compression, limiting, and equalization. In order to reduce wear on the master tape most discs are not sourced from the original master. The source tape used may be many generations removed from the original. Typically, the engineer will cut the first pressing and a "cutting master" tape in parallel. Subsequent pressings are cut directly from the cutting master. Some pressings are cut from copies of the cutting master tape. Each subsequent tape copy adds tape hiss, and wow and flutter, degrading the sound.


Recording engineer Brad Miller (1939–1998) created the first recordings on the Mobile Fidelity label during the late 1950s and 1960s. These were recordings of environmental, locomotive sounds and orchestral music, which drew interest from audiophiles but gained little attention from the public. While Miller was located in Burbank, California in 1971, the company released a few pop and orchestral recordings. This included a 7" 45 rpm single produced by Miller, "Saunders Ferry Lane"/"Early Morning". The record was credited to "Clare" and sung by British vocalist Clare Torry, who later gained fame from her performance on Pink Floyd's song "The Great Gig in the Sky".

Original Master Recordings

In 1977 Mobile Fidelity began to produce a line of records known as "Original Master Recording" vinyl LPs. These albums were previously released by other companies, licensed by Mobile Fidelity, and remastered by a process called half-speed mastering. During mastering, sound was transferred from magnetic tape to disc while the cutting lathe moved at half speed. The albums were remastered from the original analog master tapes, without compression, and with minimal equalization.[2] The recordings were pressed in Japan on "Supervinyl", a plastic compound invented by JVC to compensate for the demands of Quadrophonic Compatible Discrete 4 records, which had been introduced in 1972. JVC Supervinyl was more durable than regular vinyl, with lower surface noise and fewer pops and clicks. Mobile Fidelity packaged their albums in heavy cardboard sleeves, inner cardboard stiffeners, and plastic liners.

Half-speed mastering had been done before. Decca Records used the same process on its classical albums from 1958 to 1967. MFSL revived the practice, refined it, and made it the company's selling point. Half-speed mastering took more time than typical mastering, and it presented technical challenges. Its use was never widespread by other companies despite sonic advantages.

Stan Ricker (né Stanley Forbes Ricker; 1935–2015) mastered early Mobile Fidelity LPs. Ricker's work can be recognized by the signature "SR/2" carved in the dead wax. Jack Hunt ("JH/2") mastered many of MFSL's LP releases in the 1970s and 1980s. Some later titles were mastered by John LeMay and Paul Stubblebine, with a few uncredited releases. Currently, Shawn R. Britton and Rob LoVerde are mastering most LPs for MFSL. CDs, SACDs, and audio cassette mastering have been done by a variety of engineers, most recently Britton. The company has had only a handful of engineers in its history.


MFSL's first four half-speed master albums were pop-orchestral titles by the Mystic Moods Orchestra. Then MFSL offered well-known rock, pop, and jazz titles licensed from major record companies. The first of these was Crime of the Century by Supertramp, originally released by A&M Records in 1974. The label's biggest success at this time was Pink Floyd's The Dark Side of the Moon (1973) when it was re-issued in the Original Master Recording series in 1979.

In 1981 MFSL produced a box set of recordings by The Beatles. The box set comprised all 12 original British versions of their albums, mastered from the original Abbey Road Studios master tapes, plus Magical Mystery Tour (1967) which was sourced from US tape copies prepared by Capitol Records. An album-sized booklet displaying the original album covers was also included. This project was the first and only time The Beatles master tapes ever left Abbey Road Studios.

During the 1980s, Mobile Fidelity began to sell CDs in addition to LPs. In the 2000s it began to sell SACDs. As with the LPs, the CDs and SACDs are remastered from the original analog masters. SACDs use Direct Stream Digital (DSD) encoding rather than the more common Pulse-code modulation (PCM). Mobile Fidelity sells its remasters in limited editions of 5000 copies or fewer.[2]

Ultradisc One-Step

In 2016 Mobile Fideltiy Sound Lab launched a new ultra-premium deluxe vinyl series called Ultradisc One-Step. Releases in the series feature a reduced-step lacquer process [3], and are pressed using a proprietary SuperVinyl record compound developed by NEOTECH and RTI[4]. Ultradisc One-Step have consistently been released as 180gram 2x45RPM box sets and are always limited. The label has received some criticism from collectors for increasing the number of albums pressed per release as the series has become more popular.

Santana Abraxas 2500 2016
Bill Evans Sunday at The Village Vanguard 3000 2017
Donald Fagan The Nightfly 6000 2017
Simon and Garfunkel Bridge Over Troubled Water 7500 2018
Marvin Gaye What's Going On 7500 2018
Stevie Ray Vaughan Texas Flood 7000 2018
Bill Evans Trio Portrait in Jazz 6000 2019
Bob Dylan Blood On The Tracks 9000 2019
Thelonious Monk Monk's Dream 6000 2019
Yes Fragile 7500 Not Yet Released

Bankruptcy and revival

In November 1999 Mobile Fidelity Sound Lab shut down after the bankruptcy of M. S. Distributing, one of its biggest distributors.[6] In 2001 MFSL's assets were acquired by Music Direct. The acquisition turned over to Music Direct the company's intellectual property and the rights to the technology used in the proprietary mastering chain.[7]

Mobile Fidelity has benefited from the resurgence of interest in vinyl. From 2007 to 2013, sales of vinyl albums grew almost 500%.[8]

MoFi Electronics

In 2016 a high-end audio electronics line was introduced under the MoFi banner.[9] The MoFi Electronics line is well regarded by audio-equipment reviewers and includes turntables, phono stages, record cartridges and vinyl accessories.[10][11][12][13]

MoFi Electronics offices and turntable manufacturing are based in Ann Arbor, Michigan.[14]


  1. Strauss, Neil (1994-12-08). "Music Lovers Are Voting for Vinyl". The New York Times. Retrieved 2009-11-03.
  2. Guttenberg, Steve. "MoFi remasters, perfects LP sound". CNET. Retrieved 23 June 2016.
  4. "Mobile Fidelity Sound Lab Inc.| Audiophile Vinyl, CD, SACD". Retrieved 2019-06-09.
  5. "Ultradisc One-Step". Retrieved 2019-06-09.
  6. "Industry News November 1999". 1999-11-25. Retrieved 2010-11-12.
  7. "Mobile Fidelity Sound Lab". Retrieved 2016-06-20.
  8. della Cava, Marco (2013-01-22). "Vinyl's sonic perfection finds new fans in digital age". USA Today. Retrieved 23 June 2016.
  9. "High-end turntable makers Mo-Fi debut 'entry-level' turntable".
  10. "The MoFi Ultradeck: We Review The New Turntable From Mobile Fidelity". Vinyl Me Please. 2017-11-07. Retrieved 2019-09-30.
  11. "MoFi's Ultra Deck + M – Analogaholic, Turntables | TONEAudio MAGAZINE". Retrieved 2019-09-30.
  12. "MoFi Electronics UltraDeck+ Turntable and StudioPhono Phonostage". The Absolute Sound. Retrieved 2019-09-30.
  13. "MoFi UltraDeck+M Turntable Package". Hi-Fi News. 2019-09-04. Retrieved 2019-09-30.
  14. "Mobile Fidelity Electronics". Mobile Fidelity Electronics. Retrieved 2019-09-30.
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