Polk Audio TS x 110B Bookshelf Speaker (Black, Pair) 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