Negative stiffness is generated for a vibration system of a speaker unit by using a movable magnet attached to the vibration system of the speaker unit and also a ring like stationary magnet arranged coaxially at {HEAD ~ the outer radius} thereof in {TAIL ~ order} to increase equivalently internal volume of a cabinet 
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Negative stiffness is generated for a vibration system of a speaker unit by using a movable magnet attached to the vibration system of the speaker unit and also a ring like stationary magnet arranged coaxially at { HEAD ~ the outer radius } thereof in { TAIL ~ order } to increase equivalently internal volume of a cabinet
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