It's sad that for such high price you have this "weird buzzing sensation" (which is because it is not grounded properly), and that you can hear the buzzing sound too if you put your ear very close.
By definition you can't have grounding on a power supply without a grounding pin, unfortunately.
Apple's power supplies for MacBooks do have a grounding pin, but the default duckhead adapter they ship with usually doesn't leverage it, so you end up with a class 2 power supply and the buzzing sensation.
> that you can hear the buzzing sound too if you put your ear very close.
I've found Apple power adapters to be pretty good in that regard, unlike some third-party power supplies that I can hear across the room. If I can only hear the noise when I put my ear next to the supply, I can just not do that :)
