The C 91 is a 2-way bass reflex bookshelf speaker using a 4-inch woofer and a 1-inch decoupled tweeter to deliver remarkably accurate sound. The C 91 is available in a Dark Apple finish with satin-painted MDF baffles for a premium, contemporary appearance.High-quality cabinetry, designer finishes and advanced technologies combine to create gorgeous furniture whose exceptional acoustics are surpassed only by their beauty. High quality finishes, satin painted MDF baffles, polished chrome logo, satin aluminum trim rings, center plugs and stabilizer feet make the C 9 series aesthetically elegant, while providing exceptional acoustic performance.1-inch (25 mm) silk dome neodymium decoupled tweeter with Anti-Diffraction WaveGuide and Tweeter Distortion Reduction4-inch (101.6 mm) Hybrid Composition Conical Cone woofer with Long Displacement Surround technology