Mobile Fidelity Sound Lab (MoFi) Since 1977. Mobile Fidelity Sound Lab has operated as the undisputed pioneer and gold standard for audiophile reissues. They focus strictly on historic preservation and accurate sound reproduction from their dedicated California mastering studio. Originally rooted in field recordings by founder Brad Miller, the label revolutionized the industry by reissuing landmark albums utilizing a meticulous half-speed mastering process, going directly to the original analog master tapes to preserve the artist’s original intent without added coloration or artificial EQ. Globally recognized by their distinctive “Original Master Recording” jacket banners and numbered-edition stamps, MoFi produces premium 180g heavyweight vinyl LPs, Super Audio CDs (SACDs), and definitive UltraDisc One-Step (UD1S) box sets. To achieve this uncompromising clarity, their masters are cut in-house using customized, state-of-the-art equipment designed by the renowned audio engineer Tim de Paravicini.