The F/xi A4 features the latest generation of dynamic balance) polymer composite drivers for smooth wide-range response with low distortion. 1-Inch silk dome tweeter with neodymium magnets produces clear, detailed highs. Bipole/dipole switch, conveniently located on the front baffle, enables you to choose your sound radiation pattern according to your installation requirements.Creating the most realistic diffusion possible for your setup. Acoustically Inert 3/4 inch MDF cabinets, Finished in black and white laminate finishes. Gold-plated 5-way binding posts for the most secure connections and the most versatile wiring applications. Butyl rubber Surrounds for high performance durability acoustically Inert stamped driver baskets. Floating anti-diffraction grilles minimize grille diffraction for spacious, 3-dimensional imaging.