Hey guys,
Great forum! I just found it today. I just got my 1050 last Tuesday. I had a ground loop hum coming from my sub also. I did what it says at this link and my hum virtually went away. Now I have to put my ear actually in the port of my sub (Paradigm PS-1000) to be able to hear any hum at all.

http://www.dplay.com/tutorial/cablehum.html

Kevin C.