Well, I performed some additional troubleshooting on the receiver last night. I completely disconnected it and moved it to to other rooms, powered up and listened through the headphone jack, buzzing still there. So the issue is with the receiver. I pulled the cover off to check for any loose connections that may have occured during the move, none found. Curiously, the buzzing has changed. Whereas before it was almost non existent on the Direct setting and very noticeable on all other settings, it is now almost unoticeable on Theatre Dimensional setting and clearly audible on the Direct setting (as well as all others). The unit is out of warranty now (I bought it as a Factory Refurb, 1 year warranty), so I doubt it is worth looking into getting it fixed as I can likely replace for the cost of the repair. Bummer.
