this is my setup : Mic : Neumann U87 AI Preamp : Focusrite Liquid CHannnel
This is my problem : there must be a "ground-Problem" or something with the 50hz coming out of the power supply. I also have the "feeling" that i have some sistortions in the High-mids or the highs. Sometimes it sounds a bit like a saw. The hum (50hz) is very small when i do not touch the Characteristic-switch, but when i do it getīs much richer. It would be no good solution, just saying, "donīt touch it", because, as in the upper lines written, it sounds a bit harsh an not very clean When i connect my TLM 103 it sounds much richer in the bass and the Highs seem to be cleaner. I also brought my setup into the "Bayerischer Rundfunk" (bavarian public radio), where i work, to test, wether there is also a hum or not. There is NO hum. I also testet (at home) another Preamp - same Problem. I also tested other U87 on my Equipment - same Problem
My question would be :
1. Is the U87 so sensitiv? 2. Does anybody know a solution, to get rid of this problem?
I tried everything to ground my equipment, have bought a transformator to clean up my Power supply, nothing helped. The only thing that helps best is to use the TLM 103 or my Brauner Phantom (Both have no characteristic-switches)