So, I found out my BAT Integra Research RDA7 amp and Marantz AV7703 processor use different XLR standards, one American, one European. Couldn't lose the hum, so I went back to RCA interconnects. Sounds great driving M80s, VP160, QS8s and some Mission 77ds surrounds. Disappointed as I figured would sound even better with XLRs. I now have a big bundle of them in my large Tupperware type plastic container.
Using the Acme cryo outlets. Had Mark Schifter' Power Core 300 balanced power conditioner installed, then uninstalled it. A 25 lb. Paper weight. System sounds great on first listen. So far, just FM and internet radio. Looking forward to setting up the Oppo UDP205
