Tone arm energy shunts  --  Vibration from the stylus spreads from the cartridge through the shell and the arm, but at each interface there is a reflection which eventually arrives back at the stylus in similar manner to sound reverberation. A system of energy shunts to bridge the intersections has been devised to counteract this effect. These are fine brass wires that are bridged across physical interfaces such as the head to conduct vibrational energy across the interface and prevent it being reflected back to the stylus. They are not commonly used or well known.

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