DESC: Whats cool? The Kole Audio KMX subwoofers. A revolutionary design in a direct-coupled aluminum dust cap increases thermal transfer from the voice coil by 50%. At the same time, the newly designed dust cap lowers the resonant frequency of the subwoofer, thereby extending the low-end. Our acoustical engineers achieved their goal in making these woofers handle 56% more power over conventional designs without sacrificing sensitivity.