Speakers Annoying the Neighbors?

[JC1]

To help keep your loudspeaker's vibrations from annoying others, due to them vibrating your building structure, do this:
1. Glue or screw 4 empty cat food cans (upside down) to the bottom corners of your loudspeaker cabinets.
2. Rest the speakers on top of tennis balls inside the cans.
Jim Coe, Vibration and Acoustics Engineer