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VPI Classic & Prime Footer Inserts - replaces the rubber isolators in the Classic and Prime footer system and significantly improves turntable performance either with or without a Symposium platform.
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The current foot employed in the classic turntable series consists of a Delrin plastic base with an internal cylinder of rubber bonded to two 1/4-20 threaded rod ends. the utilization of rubber dampers is an isolation-based “solution” which creates more sonic problems than it solves. Why is this? let’s consider what happens: Technical Overview Just as an electrical ground is vital in the function of electrical circuits, mechanical ground is vital for mechanical circuits and are at the heart of effective vibration control solutions. When “isolation” (which is but one aspect of vibration control) is the sole concept considered in the design of equipment feet, the problem of energy inside the turntable, which is an equally critical aspect of vibration control, is ignored or made worse. feet with built-in sorbothane or rubber pads block the mechanical ground path out of the component by placing a mechanical “reactance” (the rubber material) directly in the ground pathway. When this happens, energy which would otherwise be able to exit from the turntable is now reflected by the rubber boundary back into the turntable. in addition, rubber also reacts to energy (which can originate in both the turntable and external sources) by storing and releasing it after a certain time delay, just like a rubber ball does when it bounces. Because of the reflection of energy back into the turntable, the rubber layer actually amplifies their effect, intensifying inborn resonances. these worsened resonances are faithfully transcribed by the phono cartridge, producing sonic colorations perceived as “muddy” bass, “bloating,” and an overly warm presentation, hallmarks of rubber “dampers” and “isolators.” this “warmth” may at first seem like a good thing, but consists of distortion products added to this vital region of the audible spectrum. While some may at first find these colorations tolerable or even euphonic, transparent music systems will reveal them, ultimately causing listening fatigue.