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M147 tube microphon/Prism Sound Orpheus Ground Loop Problem.
Author: Richard Vallance
Date: 04/22/2017
Hi... I'm using a Neumann M147 tube mic with the Neumann power supply and get a ground loop going into the input of a Prism Sound Orpheus/Apple logic audio setup. I use the Neumann PSU with the 48v Phantom power "off" on the Orpheus. The Orpheus works fine with my Neumann KM 184's using the Orpheus 48v but the M147 has an annoying low level mains hum. Anyone know how I can fix this? Thanks in advance.  
 
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