APBMW K4M -KIT 2Way TW+MID+ACC for BMW SmallBasket The two-way APBMW K4M kit creates a three-dimensional sound stage and give the musical message the essential timbre accuracy. The 100 mm (4″) midrange is provided with a water-repellent pressed-paper cone, a material providing natural sound. It features a low resonance frequency that allows hi-pass cut-off in the 150-200 Hz range for an excellent mid-low reproduction. The 25 mm coil and Tetolon dome tweeter features a great extension on both medium and high frequencies and is optimized for off-axis output, for an extended sound stage in the three dimensions, that amplifies the perception of reality in the car cabin. Features - Neodymium Magnetic group - To maximize performance while minimizing bulk and weight. 25 mm (1") fiberglass woofer voice coil - For high power dissipation and stiffness. Waterproof pressed-paper cone - For medium natural frequencies free from any plastic resonance. Aluminium die-cast basket - With Plug & Play connectors. 30 cm extension provided - Featuring Plug & Play connectors, for high flexibility of installation. Damping removable motor cover - Specially developed for the upgrade of BMW-Mini featuring factory 2 way systems To create an extended sound stage in the three dimensions, amplifying the perception of reality in the car cabin. 25 mm Tetolon coil tweeter - With dispersion characteristics optimized with FEM simulations. Tweeter support supplied - For Plug&Play OEM placements. Crossover equipped with high quality components - With Plug&Play connections.