If the hum is the unit itself physically vibrating that is due to DC offset. The tricky but free fix is to figure out what else is plugged in elsewhere that is causing it. Its tricky because people sometimes find out by accident, other times after a lot of trial and error, and sometimes they never do find the cause. The other fix is a DC offset eliminator, and there are several, and they are pretty cheap as these things go, and not worth paying more so buy the cheap one.
My system makes all kinds of noises just like this. If I went around trying to eliminate every noise that could be heard faintly in a quiet room but not at all with music I would probably have wasted so much time and money there's no way I would have the (otherwise) best sounding system on agon. But to each his own. Know thyself. To thine own self be true. Etc. Etc, et cetera.
My system makes all kinds of noises just like this. If I went around trying to eliminate every noise that could be heard faintly in a quiet room but not at all with music I would probably have wasted so much time and money there's no way I would have the (otherwise) best sounding system on agon. But to each his own. Know thyself. To thine own self be true. Etc. Etc, et cetera.