Top Definition
Mobile Fidelity Sound Lab.
Have you listened to the MFSL issue of The Beatles' "White Album" yet?
by plynth November 22, 2006
Mobile Fidelity Sound Labs

MFSL, now known as MoFi, is a mastering house/record company dedicated to releasing audiophile grade releases. Using original master tapes they produce high quality vinyl and 24k gold CD's containing the highest quality audio for the format. They are extremely hard to find and expensive. They are highly prized by audiophiles the world over.
"Dude, I listened to the MFSL version of Dark Side of the Moon and I completely forgot where I was for a while"
by dewdude January 14, 2009
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