High rigid IMPP cone - the new IMPP composite cones are designed specifically to prevent cone failures at high sound pressure levels, composite cones have a well balanced rigidity and moves in unison without any strong or weak points. Light weight surround - this makes this subwoofer different, light weight urethane rolled edges increase displacement so that high power can be efficiently handled creating more bass. Anti-dust design - Pioneer heat release structure can reduce ventilation holes and clearance gaps, the results are optimally efficient heat dissipation and prevention of entry of dust that can cause malfunction. Dual spider - two progressive flex suspension system supports the voice coil effectively by dampening the large cone vibration and enhancing linearity of sound reproduction. Years of research and state-of-art production facilities is our secret behind every Pioneer speaker^s quality sound reproduction.