MB Quart FKB110 Formula 4 Inch 2-Way Coaxial Car Speakers - Two Pairs

MB Quart FKB110 Formula 4 Inch 2-way coaxial speakers (two pairs) are engineered for durable, musical performance. Butyl rubber surrounds increase longevity and deliver stronger mid-bass impact. The voice coil is pure copper with a very thin extrusion to establish a powerful magnetic field, and the Kapton voice coil former is lightweight while efficiently dissipating heat. A natural fiber spider provides necessary flexibility and, thanks to an epoxy infusion during production, gains added structural strength. Lightweight thermal-formed polypropylene cones speed midrange response, and an over-coil cooling system permits air exchange over the voice coil through the spider.