TSx Series bi-laminate composite driver cones tuned perfectly with our Dynamic Balance process produce smooth, natural sound. They are lightweight, but super stiff, with exceptional damping, for high efficiency and low distortion. * All Polk loudspeakers are timbre-matched within their series, designed with the same components throughout, to achieve seamless speaker to speaker blending effects in multi-channel systems. * Gold-plated, professional-style 5-way binding posts, for the most secure connection options.