I just ran across Rane 110, located at [Link: rane.com]. It's a white paper that explains grounding problems in audio interconnections. You'll probably understand all of it, but if you don't, you'll pick up some information from it.
Enjoy.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
