Greetings to all, I'm in the middle of recording a project in my home studio and have run into a baffling problem with my Neumann KM184s. For reasons neither I or the techs at Sweetwater or Neumann can figure out I am getting some form of interference with the Neumann mics. It seems to be a high end noise the modulates, almost "swooshes" rather than an continuous steady sound. It is more pronounced in certain area of the room and less so in others. Sometimes a matter of a few inches makes a big difference. My signal path is rather straight forward. The Neumanns go into Grace 101 pre-amps then into a TASCAM DA-38 via the ballanced inputs. I do not have this problem when I use a Blueberry, AKG 460 or AKG414 mic. The Neumann tech said he had heard of their mics being suceptible to RF interference and suggested buying their cables, which I did, and that lessoned but did not remove the problem. I've used these mics in the past but didn't have this problem. I've switched cables, lifted grounds and moved equiptment around to no avail. I've bypassed the Graces and used the preamps in a Mackie 1202 and a Mackie D8B and the noise is still there. Thinking I might have magnetic field problems, I've shut off various electrical curcuits to see if that would help, also to no vail. I'd appreciate any suggestions for dealing with this, it's making life miserable! Thanks!