Stunning piano black mirror-finish bookshelf speakers offering clear sound balance, using VCCS (Vibration Control Cabinet Structure) technology to ensure superb sound quality. The Yamaha speaker team developed an internal structure called VCCS - Vibration Control Cabinet Structure. This technology uses strategically placed pieces of composite material, providing excellent vibration isolation performance. Their shapes, positions and angles were determined after a long process of experimentation. The result is that unwanted cabinet vibration has been greatly reduced. The sound you hear is not negatively affected by the cabinet, putting these system speakers truly in a class of their own, with clear, powerful sound that will first surprise and then delight you.