Variable frequency tampers for coated stocks used in paper feed trays

A media tray has at least a bottom and two sides positioned along edges of the bottom. The media tray is adapted to hold sheets of media. The bottom comprises openings, and projections extend through the openings in the bottom of the media tray. The projections comprise elongated structures having rounded or flattened ends. The projections extend through the openings enough to touch the bottom sheet of the sheets of media. At least one vibrating support structure is positioned on an opposite side of the bottom from the sheets of media (e.g., below the media tray). The support structure is connected to the projections in such a manner so as to vibrate the projections.