Tvad,
My listening distance is 10.5ft and I hear the buzzing from 1.5ft away. It doesn't seem to increase in intensity as I turn up the volume. I can't judge position with my volume nob but from 17dB-0db there was no increase in intensity. At +9 db maximum setting the buzzing did increase.
I've read that Nad recievers have dirty transformers hence the noise. What do you think I should do. I do have my reciever plugged into a Monster HTS2100.