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Solid Tech Rack of Silence
Designed by Bjorn Ohlson
The Solid Tech story starts about fifteen years ago when Bjorn Ohlson, a Swedish engineer, and audiophile, began experimenting with different suspension platforms for audio equipment. He quickly realized that most commercially available products did make a difference to the sound, but rarely for the better. Ohlson's extensive study and research led him to a better understanding of the fundamentals of damping and isolation of unwanted resonances in the equipment chain, resulting in the first Solid Tech platform. It quickly garnered critical acclaim from all corners of the audio world
Bjorn Ohlson explains the Rack of Silence concept:
“Since the most degrading vibrations/resonances are those with low frequency and high amplitude, our aim has been that the load-carrying structure should have a natural high resonance frequency and in a corresponding way, low amplitude at resonance(less energy storage and a quick decay). Since it is the form, size, and stiffness of the structure that determines its natural resonance frequency, we have chosen to avoid the large physical structures of shelf planes, and replaced them with struts that have a favorable stiffness-to-weight ratio for their size. The resonance frequency of the carrying structure has thus been shifted considerably higher up, resulting in lowered amplitude.
However, no matter what materials or concepts that the rack consists of, it is our firm belief that in order to obtain optimal performance, one must include effective isolation in the set up of an audio system. Any technique that does not provide isolation of external vibrations will only vary the amount of resonant stimulation added to the components concerned. It cannot reduce the level of baseline vibrations in the floor.
In order to achieve effective isolation and uncolored reproduction, there must be a freedom of movement in all planes, and the resonance frequency of the isolation material must be outside of the 20-20,000Hz audio spectrum. Our different isolation systems like the Feet and Disc of Silence as well as the shelf suspension system have at normal load a resonance frequency well below 3 Hz. This means that isolation starts at approximately 4Hz, which is clearly outside the influence of the audio range. It should be mentioned that 100% effective isolation does not exist. For that reason, our system permits and facilitates isolation in up to three steps. Namely, with permanently mounted Discs of Silence at the floor end of the corner pillars, shelf suspension and/or Disc & Feet of Silence for the isolation as close as possible to the apparatus.”