I had planned on doing so. Just waiting to receive minidsp to add that to the mix and see if it helps. Once its in, I will post it for review and recommendations. Thanks!One recommendation: if you can't find someone local to double-check you, and you have a Youtube login, pull out your phone. Open up your Neutrik connectors, and video record your entire chain, including the positions of the wires in the Neutrik connectors, and the wiring inside your dev, if possible. Show us every connection, even show us your sub trim settings in AVR menus, crossover frequencies in AVR menus, current sound mode, EQ settings in amp interface. Let us help be your eyes.
As far as the ground loop issue, there is still a possibility its a wiring issue, but some guys on here recently have had some success with a Humx (just search Amazon for Humx).