I just introduced some DH Labs Balanced XLR interconnects in my system and now it appears I have a ground loop. Before my system was dead quiet with RCAS. I have tried removing each component one by one and the only improvement I get is removing the HDMI cables going from the TV and Sat to my Anthem D2. Even after that there is an audible hum. I am ready to return my XLRs for RCAs.

I have my amp and my pre on a dedicated 20amp circuit. Everything else except the sub is hooked up to my Monster HTS2500 power conditioner.

My Gear if it helps.
Eartquake Cinenova 5 channel Amp
Anthem Statement D2 Pre
Pioneer Elite 79avi (as cd player)
Toshiba HD A1 (as DVD player)
Dish Sat HD DVR 942
Samsung HLS6187 TV
SVS PB12 Ultra/2 sub

I am remodeling so this is all the gear I have hooked up at the moment.

I will also be hooking up 2 Outlaw monos for the rears, An SMS-1, and another PB12 sub.