I have had this Onkyo receiver about a year now. Got it after my Onkyo 575 was hit by lightning last summer. I like this unit better even though it was much cheaper than the 575. It's just simpler to use and it picks up distant FM better. The only "problem" I notice is that when I stand in front of the receiver I notice a very slight humming sound (I have to be fairly close to hear it and it's very subtle). Putting my ear up to the front display of the receiver, it becomes much louder/noticeable. There is no hum at all through the speakers so this isn't a real annoyance - however, it kind of makes me think something isn't right within the receiver. It sounds a lot like transformer hum. I don't recall the 575 receiver doing this. Is this fairly "normal"?