at lowes they have some rubber blocks that people put under washing machines to keep them from walking across the room due to vibration. they are about 30 bucks for 4. at the aircondtioning contractor supply they have the cork and rubber pads in sheets. maybe these would accomplish something. or just put the volume knob up to high[er].. i have a similar problem with room air conditioners and fans. i love to listen with no noise from anything but the stereo. good luck
