{HEAD ~ A bass reproduction speaker apparatus} comprising a speaker unit having a vibration system, a cabinet to which the speaker unit is attached, a movable magnet that moves together with the vibration system of the speaker unit, and {TAIL ~ a stationary magnet} 
comprising
{ HEAD ~ A bass reproduction speaker apparatus } comprising a speaker unit having a vibration system , a cabinet to which the speaker unit is attached , a movable magnet that moves together with the vibration system of the speaker unit , and { TAIL ~ a stationary magnet }
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