View larger Specifications What Comes In The Box? View larger Frame Die-Cast Aluminum An advantage of die-casting over stamping speaker frames is the fact that a die-cast frame has better resonant frequencies. This means that the frame is able to absorb and transfer much of the energy produced by the speaker - it doesnt vibrate like a bell would when it is stricken. Another advantage is that a die-cast frame is more durable and harder to damage or break. Die-cast aluminum frames have high dimensional stability for complex shapes, good corrosion resistance, good mechanical property, and high thermal and electrical conductivity. They also retain strength at high temperatures. View larger Cone Poly Injection 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. View larger 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 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. View larger Voice Coil High Temperature Aluminum One of the most abundant elements on earth, aluminum is remarkable for its low density and for its ability to resist corrosion. It is nonmagnetic (does not have any magnetic properties) and does not easily ignite. This solid material has the ability to perform under stress in both high tension and high compression environments. Aluminum is relatively soft, making it an ideal material to use in voice coils.