The CSi A4 features the latest generation of Dynamic Balance(R) polymer composite drivers for smooth wide-range response with low distortion. 1-inch Silk/Polymer Dome Tweeter delivers smooth response and better detail. Magnetic shielding for safe placement near video sources. Neodymium magnet low-viscosity ferro-fluid cooling and a heat sink on the back of the magnet create better power handling and reliability. Dual bi-ampable gold-plated 5-way binding post inputs (with wide holes for large-gauge bare wire connections) 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.