Tomlinson Holman, his own bad self, called me this morning (I got the speakers from his company) and suggested I get some copper braid grounding strap for the chassis ground option. I have not found any yet. He said a simple wire seldom does as good a job.
The powered speakers have a balanced XLR input option but no other component in the system uses balanced connections. The system consists of: Onkyo THX Ultra receiver, Audio Control Bijou THX Ultra 5.1 channel EQ, HDTV STB, S-VHS VCR, PVR, DVD, ATT digital cable box, subwoofer amp, AudioPlex 3-zone 16 channel distributed audio system with key pads, signal links to the Master Bedroom system and a 50 inch Plasma.
I also ordered devices from Jensen Transformer that may solve the problem. They are to be connected at the powered speakers. I'll keep you informed of how it goes.