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From Sennheiser, MZA900P-4 In-Line Preamplifier is an in-line power supply and preamplifier designed for use with prepolarized condenser microphones featuring a lockable 3-pin connector. The MZA900P-4 effectively converts 48V phantom power and establishes a 3-pin XLR connection for the Sennheiser 2000, 3000 & 5000 series compatible microphones.