Sennheiser MZA900P-4 In-Line Preamplifier Call for Availability Summary: 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... MSRP: $320.00 (Inc. GST) MSRP: $278.26 (Ex. GST) Add to Cart Compare