My Parasound 2250 has a slight hum/buzz, which is audible when my ear is within a couple of feet of the amp and the room is quiet. It has a ground loop switch, which I tried but the hum remains. Is this normal or should I be concerned? Any potentially easy fixes I could try like moving cables and power cords around. I already did that a little but my set-up does not really allow for allowing wires to not cross.
Any advice or suggestions would be appreciated!