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Butyl rubber is a synthetic (man made) rubber and is valued for its chemical inertness, impermeability to air, and ability to endure or resist exposure to many types of weather fronts. Butyl rubber has applications from sports equipment to automotive parts, the medical industry and more. In this product they are used for the surrounds that connect the cone to the basket.Just like chewing gum, the butyl rubber surround in our speakers can take a significant amount of abuse without coming apart.
Polyurethane, a substance categorized as a polymer, is a resilient and durable manufactured material that can take the place of paint, cotton, rubber, metal, or wood in thousands of applications across virtually all fields. It can be hard like fiberglass, squishy like upholstery foam, protective like varnish, bouncy like rubber, or sticky like glue. In the specific case of our cones, this material allows for maximum give that produces great sounding speakers that will last a long time.
Until about 1970, all speaker voice coils were wound on paper tubes. The output of an amplifier feeds directly to the voice coil, which gets hot when driven hard, putting the paper tubes at risk of burning up. Kapton, which remains stable up to about 725 degrees Fahrenheit, became an alternative to the paper tubes. It can be made thinner and stronger, as well as take far more heat and mechanical stress. Kapton also has excellent dielectric properties.