stuck these vibration absorbers/disapaters under my preamp, and under my amps, on top of my siesmic sinks.Major improvement.Treble is sweeter, sound stage is larger, and midrange is more vibrant, than with the sinks alone Not cheap, but well worth the price if you have tubed amps. the sinks filter out the low frequency vibrations(<10hz), and the Symposium platforms absorb, and turn into heat all other frequencies, including(and especially) vibrations internally generated. Highly recomended, especially if you have sieamic sinks-great synergistic effect!