Survey of Audio Footer Designs
Stray vibrations from loudspeakers can directly transmit into the surfaces of the room through contact with the floor. This causes the surfaces of the room to sympathetically radiate these vibrations as audible noise which can affect the music listening experience. The problem is further compounded by the large surface area of the room which radiates sound with a high efficiency. Low frequency vibrations are the worst offender due to their ability to travel throughout the structure of the room with little impedance.
Even with basic vibration isolation, these degrading effects of structure-borne vibrations can be mitigated. Placing vibration isolating audio footers under loudspeakers reduces reverberation time, vibration decay artifacts, and distortion at some frequencies. Similar positive effects are experienced by isolating audio electronics from vibrations. The degree of these benefits can vary widely between audio footer designs.