I recently posted about speakers choices. I picked up my receiver today and hooked it up to my first set of speakers and was met by a loud buzz from the speakers.\n\nReceiver came in the original box and looks almost brand new aside from HDMI input scratches on the back. Yamaha HTR-5990\nNot plugged into anything but the speakers. Volume does not change the buzz. Everything is wired correctly. Switching inputs doesn't get rid of the sound but there is a very very slight frequency shift. I looked through the top vents and the two very large capacitors don't seem to be swollen or anything.\n\nHere is an image from a free app of the room frequencies:\n\n\nHere is a video with audio of the buzz. It is much louder in person. I turn it on and off. It is not the main deep buzz, but the higher frequency.\n\n\n\nAnyone have any idea what is wrong?\n\nAlso, I don't believe it is a ground loop buzz. It seems to be higher frequency. Almost like the sound you hear at a concert when they plug in a guitar. Hard to explain.