View larger View larger View larger Cone – Poly Injection Polyurethane, categorized as a polymer, is a resilient, flexible 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 upholstery foam that can be protective like varnish, bouncy like rubber, or sticky like glue. In the case of our cones, this material allows for maximum flexibility that produces great sounding speakers lasting a long time. Surround – Butyl Rubber 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 the many types of weather fronts. Butyl rubber has applications from sports equipment to automotive parts, the medical industry, and more. We use them for the surrounds that connect the cone to the basket. Food-grade butyl rubber is used in many chewing gums as the central gum base, which contributes not only the its elasticity but an obstinate, sticky quality. Similarly, the butyl rubber surround in our speakers can take an equivalent amount of abuse without quitting. Voice Coil – Kapton Until about 1970, all speaker voice coils were wound on paper tubes, which can burn up when they get hot. The voice-coil is the part of the speaker that the output of the amplifier is directly fed to, and they get hot when driven hard. Kapton, which remains stable up to about 725 degrees Fahrenheit, fixed this heat problem, as it can be made thinner and stronger, can take way more heat and mechanical stress, and has excellent dielectric properties. What Comes In The Box? Instruction manualPaper template Specifications 12 inch, 2200 Watt dual 4 Ohm voice coil subwooferImpedance: 4 OhmsResonant requency: 42HzSensitivity: 83 dB @ 1 W/1 mMounting depth: 5-1/8” (130mm)