Accordingly, the generated negative stiffness can be adjusted so that {TAIL ~ the fundamental resonance frequency} of {HEAD ~ the bass reproduction speaker apparatus} can be adjusted 
Accordingly , the generated negative stiffness can be adjusted so that { TAIL ~ the fundamental resonance frequency } of { HEAD ~ the bass reproduction speaker apparatus } can be adjusted
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH