I have observed that my Berkeley Alpha Dac is extremely sensitive to vibration. It sits on a Mapleshade Samson maple stand but it is still not happy. I have tried misc. items as footers under the BADA and [so far] the Mapleshade heavy brass cones seem to work fairly well. Before investing larger amounts of $$$ on more footers I was hoping the community might comment on some of their findings. Thank Yuuu!
Try putting a heavy book on top of it. Textbook, encyclopedia, that type of thing. See if it makes a difference. Also, if the transformer vibrates, like Cerrot says, make sure one of the cones is directly under wherever the transformer is.