Customized Cone Assembly (Plastic cone body)

Plastic cones are another form of cone material. Plastic is preferred over paper for its more rigid and durable. There’re different forms of plastic used in making cones. Today the most common form of plastic used in making cones is known as polypropylene. Polypropylene has great characteristics that make it ideal for making most cones. For instance, it’s strong, stable, consistent, and well damped. Moreover, polypropylene is flexible and easy to work with during the manufacturing process. It resists mold and mildew for it is moisture resistant.

Polypropylene cones are popular for both high-end audio and auto-sound, because they do not absorb moisture and can have low distortion. As such, it’s commonly used in bathroom speakers, in-wall and ceiling speakers, and home theatre speakers. Avoiding moisture absorption is more important than you might think, because the cone mass, Q, resonance frequency, and box tuning (on vented designs) can all shift with humidity.

Polypropylene is also preferred over other forms of plastic for its being lightweight. As such, it moves easily according to the coil vibrations. Moreover, it has electronic insulation properties. It doesn’t allow current to flow to other speaker areas. However, a major shortcoming of polypropylene is that it’s noisy when flexed.