Sennheiser MZA900P-4 In-Line Preamplifier Usually ships in 5-10 working days 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 Compare