This mid-class speaker system is a lineup of two colors, piano black finish and natural wood veneer semi-gloss finish. Woofer unit is equipped with D.D.L. (Denon Double Layer) cone unit for accurate piston motion across wide bands. In addition, the double woofer model uses a P.P.D.D. method that eliminates harmonic distortion that occurs when the speaker is driven by reversing the direction of each other, providing clear yet powerful sound.