Matt, I have been exactly where you are in regards to hum and ground loops. I tried a lot of different things before I got rid of the hum . Hum can drive a guy crazy and I tried a lot of things I found searching the internet. I ended up hooking certain components together on a dedicated power bar and removed the ground lug. Other components were connected to yet another power bar and extension cord to a plugin on a separate breaker. Start your process by keeping to a minimum of components . Cablevision cables are notorious for causing ground loops. In my main system I have zero issues but I am using components from just one company, everything is from Emotiva and using xlr's and is dead silent.
