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Mobile Fidelity Sound Lab
Mobile Fidelity Sound Lab (MFSL or MoFi) is a re-issue record label known for the production of audiophile-quality sound recordings. MFSL recordings are released under the trademark name 'Original Master Recording' and are usually sourced from first-generation tape analog master recordings through highly specialized equipment. MFSL has issued titles on LP, cassette tape, DAT, CD and SACD. Each title is licensed from the original record company for a limited period of time and production runs are usually restricted to a few thousand units each.
The emphasis on quality at MFSL has been praised by critics and music fans. After the label's initial success in the 1970s both major record labels and small startups began producing Half-speed Mastered albums advertised as being sourced directly from original master tapes. Other labels include Columbia Records Mastersound, MCA Records Ultimate MasterDisc, Nautilus SuperDiscs, Dunhill Records DCC series, Practical HiFi Magazine's Nimbus Supercut, JVC's XRCDs, Audio Fidelity and Acoustic Sounds' Analogue Productions.
==Background==
In the 1950s and 1960s, it was common for record labels to press relatively heavy records on new or "virgin" vinyl. Through the oil crisis and economic downturn of the 1970s, the cost of record pressing increased. As a result, record labels became more likely to press light weight records from recycled materials (which contain impurities). This resulted in more pops, clicks and higher levels of surface noise.
The experience and talent of the mastering engineer can have a major impact on the sound of a particular record. Mastering engineers would often compromise the sound on the original tape by applying equalization, dynamic range compression, and groove velocity limitation when cutting a record. This is to ensure that the album would be playable on inexpensive, low grade consumer equipment. Major record companies use factories in differing geographic regions and this means record quality can vary on different production runs of the same title. This is due to differences in plating of metal parts used in manufacturing and differences in record pressing machines.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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