Ge7,
One pair of powered monitors I own hum if they are plugged into different outlets. If they are plugged into the same outlet or into a power conditioner (which is plugged into one outlet), they don't hum.
One pair of powered monitors I own hum if they are plugged into different outlets. If they are plugged into the same outlet or into a power conditioner (which is plugged into one outlet), they don't hum.