I have tried unplugging all sources, did not fix.
Speaker wire is good 14 gauge for all but rear surrounds (looks to be 16 gauge for most, then 18 gauge for ~6')
I have not started unplugging everything from the back of the receiver yet (PITA) but will if nothing easier fixes. I have also unplugged the CATV coax, but did this far away from receiver (again, PITA to get behind TV/receiver right now).
My leading suspect is CATV right now. I found the ground cable that Time Warner installed. They did a crappy job (please Verizon, bring FTTP to the boonies!!).
I have heard examples of ground loop interference in car/boat stereo, and it is typically a hiss or hum; sometimes changing (in case of motors, etc.). I do not have a hum or hiss, only a ticking every second; constant pitch (sounds like a clock ticking). What could give a tick/click with a period of one second, in all 7 speakers, that does not get amplified with increasing volume from amp?? Some kind of timing circuit?
I would like to try to determine what can make such interference before I start systematically start moving cables around. Thanks for the help so far . . . .
(Message edited by tdeneka on October 30, 2006)