diamond tweeter The same is true for the properties of the diamond tweeter (optional feature). Not only is diamond light and stiff, it is also the hardest material and the one with the best heat dissipation of all materials in the world. Especially important is the high heat dissipation as it prevents the voice-coil from becoming warm which leads to a compression of dynamics and worse resolution. In combination with our steep filter crossover this tweeter is almost indestructable.